CN106929788A - A kind of multi-element alloy coat of sinking roller and its preparation and spraying method - Google Patents
A kind of multi-element alloy coat of sinking roller and its preparation and spraying method Download PDFInfo
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- CN106929788A CN106929788A CN201710306412.1A CN201710306412A CN106929788A CN 106929788 A CN106929788 A CN 106929788A CN 201710306412 A CN201710306412 A CN 201710306412A CN 106929788 A CN106929788 A CN 106929788A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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Abstract
The invention discloses a kind of sinking roller multi-element alloy coat and its preparation and spraying method, belong to the recovery technique field of sinking roller.A kind of sinking roller multi-element alloy coat of the invention, sinking roller basic unit, transition zone and working lining are followed successively by from inside to outside, transition zone is NiCrAlY sprayed coatings, in sinking roller basic unit, spraying NiCrAlY is transition zone as metal bonding coating, can eliminate the unmatched problem of material thermal expansion coefficient between antiwear heat resisting working lining and sinking roller basic unit；Working lining is NiCr Cr3C2Composite coating, NiCr alloys have a performances such as excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation, and Cr3C2With preferable high temperature hardness and high temperature oxidation resistance, play hard phase, and immiscible with zinc liquid, nonwetting, thus can substantially reduce because thermal shock and caused by disbonding even fail, so as to solve technical problem of the invention.
Description
Technical field
The present invention relates to the recovery technique field of sinking roller, more particularly to a kind of sinking roller multi-element alloy coat and its preparation
And spraying method.
Background technology
Sinking roller and stabilizing roller in Continuous Hot Dip Galvanizing Line are received because long-term work is in 500 DEG C of galvanizing zinc
Strong corrosion and infiltration to zinc metallic solution, roll surface easily produce spot corrosion, pit and become coarse, have a strong impact on the flat of roll surface
Whole degree, and then influence the surface quality of galvanized sheet；Steel band is up to 35~40m/s by the movement velocity that roll surface drives simultaneously, therefore
Trigger fretting wear, roller loss is fairly obvious, it is necessary to often change, increase production cost influences production efficiency.In order to improve
With the surface property and service life that improve such roller, conventional method is to utilize plasma spray technology at present, in its surface thermal jet
One layer combines jail, anticorrosion, wear-resisting coating.Defect is：Unavoidably there are a large amount of holes in thermally sprayed coating, cause compactness
Difference, the diffusion for existing for zinc of these holes provides diffusion admittance, and adhesion is poor, easy to fall off between coating and matrix；During spraying
Sprayed on material oxidation Decomposition rate is high, and powder using efficiency is low.
Except corrosion and crossover failure in addition to, the sinking roller with coating structure be also faced with because coating combined with matrix it is bad draw
The failure modes such as the peeling for rising.When coating and matrix have bubble, slag inclusion, layering, can often trigger before normal wear failure
The failure such as face crack or surface peeling.Because sinking roller is under the influence of itself residual tension and cyclic thermal stres, coating
Bond strength and coating surface homogeneity of ingredients deficiency cause sinking roller coating material thermal shock resistance not good enough.Sometimes, exist
During actual manufacture sinking roller, often occurs micro-crack when coating material is combined bad with matrix, micro-crack should in cycling hot
Extension is spread under the conditions of power, so that peel off, or even body of roll fracture.Therefore, coating material selection and preparation technology
It is very important influence factor.
Sadangi of Rutger universities of the U.S. et al. utilizes " spray drying → reduction decomposition → gas carburization " technique to prepare
Granularity is 0.6 μm of Cr3C2Powder (referring to R.K.Sadangi, L.E.McCandlish, B.H.Kear,
P.Seegopaul.Synthesisandcharacterizationofsubmicronvanadiumandchromiumcarbide
Graingrowthinhibitors.AdvancesinPowderMetallurgy＆Particu larMaterials, 1998：P9-
P15).Its technical process is：The precursor solution containing Cr is prepared first, is then spray-dried, then the powder that will be spray-dried
End is pyrolyzed, and the product after pyrolysis is carried out into gas carburization with CH4/H2 mixed gas.The method exist subject matter be
Technique is more complicated, and the granularity of obtained chromium carbide powder is bigger than normal, it is impossible to meet chromium carbide powder answering in modern industry
With.
Through retrieval, Chinese patent application, publication number：CN103741090A, publication date：2014.04.23, one kind is disclosed
The spraying method of resistance to sinking roller and stabilizing roller face coat, belongs to molten state clad material spray technique field, more particularly to one
Plant and be applied to sinking roller and stablize powder feeding rate resistance to high temperature corrosion high, the spraying method of abrasion-resistant coatings of roller surface.The method is pressed
Following steps are carried out：The pretreatment of workpiece, spraying operation, coating surface cleaning, roughness adjustment, sealing pores, dynamic balancing examination
Inspection, test package.Powder using efficiency is high during spraying, and powder feeding rate reaches 45%；During spraying WC base coatings, the WC particle after spraying
Oxidation Decomposition is few, while Binder Phase Co is also advantageous for the deficiency in terms of the combination between coating endoparticle, supplement coating toughness, coating
Hardness HV1 >=1050, it is ensured that coating has higher hardness and good toughness；Sealing pores after coating spraying, further fill out
The hole filled in coating, porosity is less than 0.5%, prevents corrosive medium from entering corrosion workpiece by coating porosity.But the invention
Combined using WC/Co, bond strength is not high, it is easy to which stress changes and occurs to peel off and fail.
The content of the invention
1. the invention technical problem to be solved
For exist in the prior art sink roll face be also easy to produce spot corrosion, pit and become coarse and film layer and matrix
Conjugation is not high the problems such as cause service life short, the invention provides a kind of sinking roller multi-element alloy coat and its preparation and spray
Coating method.It with good liquid zinc corrosion resistant, abrasion resistance properties, and is reached by optimizing multi-element alloy coat composition and distribution
The purpose for improving bond coating and the bond strength of sinking roller basic unit is arrived.
2. technical scheme
The mechanism of liquid zinc corrosion sinking roller is：There is dissolving reaction in Fe and Zn, generate FeZn compounds in hot environment,
Become slag charge to enter in zinc liquid, and then abrasive wear is produced in roll surface.The mechanism of abrasion mainly includes that abrasive wear, plasticity become
Shape, brittle fracture and come off.The principal element for influenceing wear out failure is ratio, the material of abrasive material and sinking roller matrix microhardness
Mechanical performance etc..Under liquid zinc corrosion and the double action of abrasion, sinking roller surface metal constantly dissolves, and particulate is continuous
Separated with the body of roll, working lining is thinning, barrel diameter diminishes, hardness and wearability synchronously decline, when barrel diameter and hardness decline
During to minimum permissible value, that is, reach failure.Except corrosion wear failure is outer, the sinking roller with coating structure be also faced with because of coating and
Peeling that matrix causes with reference to bad and because caused by coating structure defect zinc immersion enter, the failure shape such as coating cracking
Formula.When coating structure is present compared with gross blow hole, or even micro-crack, and when larger with matrix thermal stress, often can be in normal corrosive wear
Before failure, trigger the failure such as face coat cracking or surface peeling.
Based on material multi-component alloying it is theoretical and take into full account coating and sinking roller basic unit physical and chemical performance (coefficient of expansion,
Elastic modelling quantity) matching characteristic, analyzed with reference to sinking roller literature survey and basic data, the present invention is selected coating material and design
Not only to consider coating material service behaviour, such as wear-resistant, high temperature oxidation resisting and corrosion-resistant performance, be followed because sinking roller is in
Ring alternating hot and cold stress, is the material failure for preventing from triggering by disbonding, bond strength and coating and sinking roller
Basic unit's physico-chemical property (coefficient of expansion etc.) matches the factor for needing emphasis to consider.
Therefore, sinking roller coating material prepare it is important that control coating material contact with zinc liquid, make that its is immiscible, no
Wetting, while the porosity of coating should be controlled strictly, it is to avoid zinc immersion enters, and is reacted with matrix material, additionally, coating and base
Body material should ensure that metallurgical binding, to avoid the failure modes such as the disbonding that causes by thermal shock.Therefore, for sinking roller
The selection and optimization of speech, coating material and preparation technology is most important.
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of sinking roller multi-element alloy coat, is followed successively by sinking roller basic unit, transition zone and working lining, the mistake from inside to outside
Layer is crossed for NiCrAlY sprayed coatings, spraying NiCrAlY is transition zone as metal bonding coating in sinking roller basic unit, can be eliminated resistance to
The unmatched problem of material thermal expansion coefficient between heat-resisting working lining and sinking roller basic unit is ground, to reduce by working lining and sinking roller
The thermal stress that basic unit's coefficient of expansion is mismatched and caused, improves the mechanical matching and physical compatibility between working lining and sinking roller basic unit
Property；The working lining is NiCr-Cr3C2Composite coating, NiCr alloys have the property such as excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation
Can, also act as the effect of Binder Phase, Cr3C2With preferable high temperature hardness and high temperature oxidation resistance, play hard phase,
The effect of second phase particles dispersion-strengtherning is also primarily served in coating, it is immiscible with zinc liquid, nonwetting, can solve the problem that sinking roller exists
Easily loss, the relatively low problem of service life under high temperature complex working condition.And, NiCr-Cr3C2With the line close with sinking roller
The coefficient of expansion, thus can substantially reduce because thermal shock and caused by disbonding even fail, so as to solve skill of the invention
Art problem.
Further technical scheme, the NiCrAlY spray layer thickness is 50~100 μm；The NiCr-Cr3C2It is compound to apply
Thickness degree is 200~500 μm, according to different ratio and spraying method regulation thickness.
Further technical scheme, in NiCrAlY sprayed coatings, Cr contents are 10~30%, and Al content is 0~7%；Y contains
It is 1~3% to measure, and Al, Cr can suppress the oxidation of alloy-layer, but too high Al amounts can bring extra fragility, and Ni and Al occurs anti-
Should, intermetallic compound is generated, and amount of heat is discharged, bond coating is formed micro- metallurgical junction with sinking roller substrate surface
Close, so as to improve the bond strength of bond coating and sinking roller basic unit, Y element is suitably added can effectively reduce material oxidation, enter
One step improves matrix and anchoring strength of coating；The NiCr-Cr3C2In composite coating, Cr3C2Content is for 70~80%, NiCr
20~30%, the NiCr tack coats and NiCr-Cr of the two percentage ranges3C2Cermet has preferably mutual fusibleness, wherein
Cr3C2Content is generally that 80%, NiCr is 20%, subsequently through the detection of the characterizing methods such as wearability, may certify that it is optimal ratio
Example.
A kind of preparation method of the multi-element alloy coat of sinking roller, wherein, the Cr3C2Preparation method be：
Step one：Mixing：During ammonium dichromate powder and nanometer carbon black powder are placed in into distilled water or deionized water, mixing is stirred
Mix uniformly in flow-like, it is compressing in presoma in addition mould；In bulk after compacting, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to anxious jelly in space carries out anxious jelly；The anxious purpose frozen is as short as possible
Time in allow fluid freeze, ammonium dichromate powder and nanometer carbon black powder to be positioned rapidly after stirring, in case stops shape stream
Body is layered due to the difference of density, causes the skewness of chromium source and carbon source after follow-up frozen dried, and causes carburizing reagent
Unbalanced adverse consequences；
Step 3：It is lyophilized：The anxious presoma for having frozen quickly is transferred in vacuum freeze drying cabin and is freezed, after freezing
Blocks is many micropore shape honeycomb blocks of formation after hydrone distillation, and Volume Changes are small, and uniform chromium source and carbon source are positioned
Will not change, and, in freeze-drying process, there is following reaction in drying process in ammonium dichromate powder at low temperature：
(NH4)2Cr2O7(s)=Cr2O3(s)+N2↑+4H2O (2-1)
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, with the rising of temperature, carbon is gradually by the high price oxygen of chromium
Compound is reduced into the low oxide of chromium, and the carbon source that position is fixed with its peripheral location also reacted by relatively-stationary chromium source,
Uniform chromium carbide is ultimately generated, but also is nano level chromium carbide；The uniformity of blocks micropore after due to freezing,
The absorption of heat is also than more uniform in reaction, so as to realize being obtained the purpose of even-grained nano level chromium carbide；
3Cr2O3(s)+13C (s)=2Cr3C2(s)+9CO (2-2)；
3(NH4)2Cr2O7(s)+13C (s)=2Cr3C2(s)+9CO+12H2O+3N2↑ (2-3) (W-response process).
Further preparation method, in step one, the proportioning of ammonium dichromate and nanometer carbon black powder is 1：(0.17~
0.21), in case the excessive residual in blocking source or chromium source；Distilled water or deionized water consumption are：The 55%~60% of powder gross weight,
It is suitable fluid completed state scope for the uniform mixing of ammonium dichromate and nanometer carbon black powder；It is anxious in step 2
It is -100~-140 DEG C to freeze temperature, and the time is 30~150min, to reach the rapid and thorough effect for forming blocks；Step 4
In, being warming up to 900~1200 DEG C carries out carbonizing reduction.
Further preparation method, in step 3, lyophilized technique curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, 2 DEG C/min of intensification slope, 100 DEG C are kept for 30~40 minutes, are evacuated to
Within 60Pa；
B, mid-term：Plate temperature is cooled to 80~85 DEG C/min, is kept for 50~60 minutes, and vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 50~65 DEG C/min, are kept for 80~200 minutes, and vacuum control is within 80Pa.
In freeze-drying process, the relative low temperature state of material is kept, prevent reaction excessively strong and cause reaction uneven；
A kind of spraying method of the multi-element alloy coat of sinking roller, step is：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, and rear blasting treatment improves the adhesive force of spray film；
Step 2) spraying：Sprayed with HVOF methods, due to the various composition in multi-element alloy coat of the invention,
Nano level granularity can be obtained, therefore, being sprayed with HVOF (supersonic spray coating) method, effect is more obvious, obtained
Alloy coat adhesive force is stronger, and the porosity of coating is smaller.
Further spraying method, in pre-treatment, polishing is polished substrate surface using 800#~1000# sand paper,
With washes of absolute alcohol, acetone degreasing；Sinking roller surface is mechanical grinding at least Sa3 grades of cleannes；Blasting treatment uses grain
Footpath is that 0.1~0.5mm iron-sands are abrasive particle, and compressed air pressure ＞ 0.8MPa, sandblasting distance is 80~100mm, sandblasting angle
It is 20 °, smart rugosity is reached RZ40~70 μm.
Further spraying method, in HVOF methods：
The spraying method parameter of NiCrAlY is：Oxygen flow：1900~2000SCFH；Kerosene oil flow：20~21LPH；Send
Powder speed is：4.5~5.5RPM；360~380mm of spray distance；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1800~1900SCFH；Kerosene oil flow：22~23LPH；
Powder feed rate is：4.5~5.5RPM；360~380mm of spray distance.
Further spraying method, also including step 3)：After cooling laser remolten PROCESS FOR TREATMENT, laser are carried out with laser
Power is 900~1000W, and sweep speed is 550~600mm/min, 10 × 3mm of spot size.
3. beneficial effect
The technical scheme provided using the present invention, compared with prior art, is had the advantages that：
(1) a kind of sinking roller multi-element alloy coat of the invention, in sinking roller basic unit, spraying NiCrAlY is bonded as metal
Layer is transition zone, can eliminate the unmatched problem of material thermal expansion coefficient between antiwear heat resisting working lining and sinking roller basic unit,
To reduce the thermal stress for being mismatched and being caused by working lining and the sinking roller basic unit coefficient of expansion, improve working lining and sinking roller basic unit
Between mechanical matching and physical compatibility；NiCr alloys also have the performances such as excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation, also
Play a part of Binder Phase, Cr3C2With preferable high temperature hardness and high temperature oxidation resistance, play hard phase, in the coating
The effect of second phase particles dispersion-strengtherning is also primarily served, it is immiscible with zinc liquid, nonwetting, can solve the problem that sinking roller is multiple in high temperature
Easily loss, the relatively low problem of service life under general labourer's condition.And, NiCr-Cr3C2System is expanded with the line close with sinking roller
Number, thus can substantially reduce because thermal shock and caused by disbonding even fail, so as to solve technical problem of the invention；
(2) a kind of sinking roller multi-element alloy coat of the invention, can be according to different coating composition proportion and spraying method
The different coating layer thickness of regulation, to adapt to the sinking roller of different size, highly versatile；
(3) a kind of sinking roller multi-element alloy coat of the invention, the restriction of membranous layer ingredient proportioning, Al, Cr can suppress to close
The oxidation of layer gold, but too high Al amounts can bring extra fragility, and Ni reacts with Al, generates intermetallic compound, and discharge
Go out amount of heat, bond coating is formed micro metallurgic bonding with sinking roller substrate surface, so as to improve bond coating and sinking roller
The bond strength of basic unit, Al content be 0~7% restriction taken into account of both factor, Y element is suitably added can effectively be reduced
Material oxidation, further improves matrix and anchoring strength of coating；And the coating of Al content 7%, test by contrast, it is better；
Cr3C2Content is that 70~80%, NiCr is 20~30%, NiCr tack coats and NiCr- that the two percentage ranges are limited
Cr3C2Cermet has preferably mutual fusibleness, wherein Cr3C2Content is generally that 80%, NiCr is 20%, subsequently through wearability
Deng the detection of characterizing method, may certify that it is optimal proportion；
(4) a kind of preparation method of the multi-element alloy coat of sinking roller of the invention, especially Cr3C2Lyophilized technique system
Preparation Method, the forerunner's blocks after freezing is many micropore shape honeycomb blocks of formation after hydrone distillation, and Volume Changes are small,
Even chromium source and carbon source positioning will not be changed, and also relatively-stationary chromium source is carried out the carbon source that position is fixed with its peripheral location
Reaction, ultimately generates uniform chromium carbide, but also be nano level chromium carbide；Blocks micropore is equal after due to freezing
Even property, the absorption of heat is also than more uniform in reaction, so as to realize being obtained the purpose of even-grained nano level chromium carbide；
(5) a kind of preparation method of sinking roller multi-element alloy coat of the invention, the use of lyophilized technique makes ammonium dichromate
To limit scope with the proportioning of nanometer carbon black powder can carry out accurate determination as far as possible according to chemical equation, it is to avoid excessive
Impurity, is prevented from the excessive residual of carbon source or chromium source and influences film quality；
(6) preparation method of a kind of sinking roller multi-element alloy coat of the invention, in freeze-drying process, the model of temperature of heating plate
Restriction is enclosed, the relative low temperature state (less than heating plate temperature) of material can be kept, prevented reaction excessively strong and cause reaction not
Uniformly；
(7) a kind of spraying method of sinking roller multi-element alloy coat of the invention, is sprayed with HVOF methods, due to this
Various composition in the multi-element alloy coat of invention, can be obtained nano level granularity, therefore, with HVOF (supersonic spray coating)
Method is sprayed, and effect is more obvious, and obtained alloy coat adhesive force is stronger, and the porosity of coating is smaller；
(8) it is each in the spraying method of a kind of sinking roller multi-element alloy coat of the invention, spraying pre-treatment and spraying
Kind of technological parameter, is that inventor combines the obtained nanoscale powder material of the present invention, is carrying out various data acquisitions, analysis, always
Obtained on the basis of the creative works such as knot, the intensity of obtained coating reaches more than 80MPa, and hardness reaches more than 1200HV,
Below porosity 1%, the more conventional WC-Co coatings of service life improve more than 1 times, and actual work is carried out on small-sized galvanization production line
Make, service life was more than 25 days；And, in hardness test：NiCr/Cr3C2-20NiCr coatings are shown by interface to facing surface
Microhardness is stepped up, up to 1363.3HV；
(9) a kind of spraying method of sinking roller multi-element alloy coat of the invention, laser remolten technique can make coating and base
Material forms metallurgical binding, and the metallographic structure of its alloy-layer has fine and closely woven needle-like or dendritic eutectic structure, improves metal raw
The affinity of son, and then further increase coating and base material combination degree.
Brief description of the drawings
Fig. 1 is structural representation after sinking roller multi-element alloy coat of the invention amplifies；
Fig. 2 is the NiCr/WC-Co coatings cross-section microhardness distribution figures of comparative example in embodiment；
Fig. 3 is NiCrAlY/Cr3C2-20NiCr coatings cross-sections microhardness distribution figure of the invention；
Fig. 4 is coating cross sections microhardness distribution statistical chart；
Fig. 5 is the burner nozzle constructed schematic diagram in the present invention；
Fig. 6 is the array type burner nozzle constructed schematic diagram in embodiment 10.
In figure：1st, multigroup nozzle；2nd, compressed air inlet pipeline；3rd, gas pressure regulating valve；4th, slurry passage.
Specific embodiment
To further appreciate that present disclosure, the present invention is described in detail with reference to accompanying drawing (note：As do not indicated especially,
Content is expressed as weight content in embodiment).
Embodiment 1
The sinking roller multi-element alloy coat of the present embodiment, as shown in figure 1, being followed successively by sinking roller basic unit, transition from inside to outside
Layer and working lining, the transition zone are NiCrAl sprayed coatings；The working lining is NiCr-Cr3C2Composite coating.
The sinking roller multi-element alloy coat material of the present embodiment prepares：NiCrAl nano powders, NiCr-Cr3C2Mixing nanometer
Powder；
A kind of spraying method of the multi-element alloy coat of sinking roller of the present embodiment, step is：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, rear blasting treatment；
Step 2) spraying：Sprayed with HVOF methods.
The sinking roller multi-element alloy coat of the present embodiment and its preparation and spraying method, NiCrAl is sprayed in sinking roller basic unit
It is transition zone as metal bonding coating, material thermal expansion coefficient can be eliminated between antiwear heat resisting working lining and sinking roller basic unit not
The problem of matching, to reduce the thermal stress for being mismatched and being caused by working lining and the sinking roller basic unit coefficient of expansion, improves working lining
With the mechanical matching and physical compatibility between sinking roller basic unit；NiCrAl alloys also have excellent heat-resisting, corrosion-resistant, high temperature resistance
The performances such as oxidation, also act as the effect of Binder Phase, Cr3C2With preferable high temperature hardness and high temperature oxidation resistance, hard phase is played
Effect, also primarily serves the effect of second phase particles dispersion-strengtherning in the coating, can solve the problem that sinking roller in high temperature complex working condition
Under easily loss, the relatively low problem of service life.And, NiCr-Cr3C2With the linear expansion coefficient close with sinking roller, so that
Can substantially reduce because thermal shock and caused by disbonding even fail, so as to solve technical problem of the invention.
Embodiment 2
The sinking roller multi-element alloy coat of the present embodiment, basic structure is with embodiment 1, difference：Transition zone is
NiCrAlY sprayed coatings.Ni can react with Al, generate intermetallic compound, and discharge amount of heat, make bond coating
Form micro metallurgic bonding with sinking roller basic unit, and Y element is suitably added and can effectively reduce material oxidation, further improve matrix with
Anchoring strength of coating, so as to improve the bond strength of bond coating and sinking roller basic unit.
Embodiment 3
The sinking roller multi-element alloy coat of the present embodiment, basic structure is different and the improvement is that with embodiment 1：
NiCrAlY spray layer thickness is 50 μm, and Cr contents are 10%, and Al content is 4%；Y contents are that 3%, Ni contents are 83%；
NiCr-Cr3C2Composite coating thickness is 200 μm, Cr3C2Content is that 70%, NiCr is 30%, the NiCr of this percentage range
Tack coat and NiCr-Cr3C2Cermet has preferably mutual fusibleness.
The sinking roller multi-element alloy coat material of the present embodiment prepares：NiCrAlY nano powders, NiCr-Cr3C2Mixing nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.17 proportioning is placed in powder
In the distilled water of gross weight 55%, mixing and stirring is in flow-like, compressing in presoma in addition square dies；After compacting
In bulk, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -100 DEG C of anxious jellies in space carries out anxious jelly 150min；The anxious purpose frozen
It is to allow fluid freeze, ammonium dichromate powder and nanometer carbon black powder to be positioned rapidly after stirring in the time as short as possible,
To prevent block fluid to be layered due to the difference of density, the skewness of chromium source and carbon source after follow-up frozen dried is caused；
Step 3：It is lyophilized：The anxious presoma for having frozen quickly is transferred in vacuum freeze drying cabin and is freezed, plate temperature control system
Below 100 DEG C, the blocks after freezing is many micropore shape honeycomb blocks of formation after hydrone distillation, and Volume Changes are small,
Uniform chromium source and carbon source positioning will not change, and, in freeze-drying process, ammonium dichromate powder drying process at low temperature
It is middle that following reaction occurs：
(NH4)2Cr2O7(s)=Cr2O3(s)+N2↑+4H2O (2-1)
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, with the rising of temperature, carbon is gradually by the high price oxygen of chromium
Compound is reduced into the low oxide of chromium, and the carbon source that position is fixed with its peripheral location also reacted by relatively-stationary chromium source,
Uniform chromium carbide is ultimately generated, but also is nano level chromium carbide；The uniformity of blocks micropore after due to freezing,
The absorption of heat is also than more uniform in reaction, so as to realize being obtained the purpose of even-grained nano level chromium carbide；
3Cr2O3(s)+13C (s)=2Cr3C2(s)+9CO (2-2) (carburizing reagent)；
3(NH4)2Cr2O7(s)+13C (s)=2Cr3C2(s)+9CO+12H2O+3N2↑ (2-3) (W-response process)；
A kind of spraying method of the multi-element alloy coat of sinking roller of the present embodiment, step is：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, and polishing is using 800#~1000# carborundum papers to base material
Surface is polished, with washes of absolute alcohol, acetone degreasing；Sinking roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards
Blasting treatment, is that 0.1mm iron-sands are abrasive particle using particle diameter, and compressed air pressure 1.0MPa, sandblasting distance is 80mm, sandblasting angle
It is 20 ° to spend, and smart rugosity is reached RZ40 μm；
Step 2) spraying：Sprayed with HVOF methods：
The spraying method parameter of NiCrAlY is：Spray tip oxygen flow：1900SCFH；Kerosene oil flow：20LPH；Powder feeding
Speed is：4.5RPM；Spray distance 360mm；
NiCr-Cr3C2Spraying method parameter be：Spray tip oxygen flow：1800SCFH；Kerosene oil flow：22LPH；Send
Powder speed is：4.5RPM；Spray distance 360mm.
A kind of multi-element alloy coat of sinking roller of the present embodiment, after testing：
Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained
The intensity of coating reaches 89MPa；
Coating hardness is analyzed：Measured using Vickers, hardness reaches more than 1200HV,
Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and dried process
Specimen surface.Test solution in paste penetrates into coating porosity, and with parent metal effect, spot of the generation with characteristic color is right
Coloured speckle number is counted on lotion, you can obtain coating porosity, measures porosity 0.77%；
Coating service life is detected：Real work is carried out on small-sized galvanization production line, service life was more than 20 days.
Embodiment 4
The sinking roller multi-element alloy coat of the present embodiment, basic structure is different and the improvement is that with embodiment 1：
NiCrAlY spray layer thickness is 100 μm, and Cr contents are that 30%, Y contents are that 3%, Ni contents are 67%；NiCr-Cr3C2It is compound to apply
Thickness degree is 500 μm, Cr3C2Content is that 75%, NiCr is 25%, the NiCr tack coats and NiCr- of this percentage range
Cr3C2Cermet also has preferably mutual fusibleness.
The sinking roller multi-element alloy coat material of the present embodiment prepares：NiCr nano powders, NiCr-Cr3C2Mixing nano powder,
Wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.21 proportioning is placed in powder
In the distilled water of gross weight 60%, mixing and stirring is in flow-like, compressing in presoma in addition square dies；Use 2Mpa
In bulk after pressure compacting, thickness is depressed into for 3cm, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -140 DEG C of anxious jellies in space carries out anxious jelly 30min；
Step 3：It is lyophilized：The anxious presoma for having frozen quickly is transferred in vacuum freeze drying cabin and is freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, intensification slope 2 DEG C/min, 100 DEG C are kept for 30 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 60 minutes, and vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 50 DEG C/min, are kept for 200 minutes, and vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 30 minutes to be kept for 30 minutes, 1100 DEG C are cooled in 10 minutes and are kept again 40 minutes, dropped again in 10 minutes
Temperature is incubated 20 minutes to 1000 DEG C, is cooled to 900 DEG C in 10 minutes again and is kept for 10 minutes, and the advantage of this stage cooling is,
The stability of reaction is kept, and then the uniformity of carburizing reagent can be ensured and realized that the more uniform nanoscale of granularity is obtained
Chromium carbide, detected through SEM ESEMs, particle size is about that between 35-40nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of sinking roller of the present embodiment, step is：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, and polishing is entered using 1000# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Sinking roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.5mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.2MPa, and sandblasting distance is 100mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ70 μm；
Step 2) spraying：Sprayed with HVOF methods：
The spraying method parameter of NiCrY is：Oxygen flow：2000SCFH；Kerosene oil flow：21LPH；Powder feed rate is：
5.5RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1900SCFH；Kerosene oil flow：23LPH；Powder feed rate
For：5.5RPM；Spray distance 380mm.
A kind of multi-element alloy coat of sinking roller of the present embodiment, after testing：
Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained
The intensity of coating reaches 97MPa；
Coating hardness is analyzed：Measured using Vickers, hardness reaches more than 1300HV,
Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and dried process
Specimen surface.Test solution in paste penetrates into coating porosity, and with parent metal effect, spot of the generation with characteristic color is right
Coloured speckle number is counted on lotion, you can obtain coating porosity, measures porosity 0.87%；
Coating service life is detected：Real work is carried out on small-sized galvanization production line, service life was more than 28 days.
During detection, inventor is investigated thermal shock resistance of the coating under 500 DEG C of (every 10min quenchings once) hot conditions
Can, NiCr/Cr3C2-25NiCr coatings are through more than 50 circulations without peeling off.
Strength test：Using E-7 glue as binding agent, stretching experiment is carried out after solidification, with 0.1mm/min rate tensiles,
When tensile strength is 97.5MPa, bonding sample is broken, and the plane of disruption is in glued layer, to show that anchoring strength of coating is more than
97.5MPa。
Embodiment 5
The sinking roller multi-element alloy coat of the present embodiment, basic structure is different and the improvement is that with embodiment 1：
NiCrAlY spray layer thickness is 75 μm, and Cr contents are 20%, and Al content is 5%；Y contents are that 2%, Ni contents are 75%；
NiCr-Cr3C2Composite coating thickness is 300 μm, Cr3C2Content is that 80%, NiCr is 20%.
The sinking roller multi-element alloy coat material of the present embodiment prepares：NiCrAlY nano powders, NiCr-Cr3C2Mixing nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.19 proportioning is placed in powder
In the distilled water of gross weight 60%, mixing and stirring is in flow-like, compressing in presoma in addition square dies；With
In bulk after the compacting of 1.2Mpa pressure, thickness is depressed into for 2cm, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -120 DEG C of anxious jellies in space carries out anxious jelly 80min；
Step 3：It is lyophilized：The anxious presoma for having frozen quickly is transferred in vacuum freeze drying cabin and is freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, intensification slope 2 DEG C/min, 100 DEG C are kept for 40 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 85 DEG C/min, is kept for 50 minutes, and vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 55 DEG C/min, are kept for 120 minutes, and vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 40 minutes to be kept for 25 minutes, 1100 DEG C are cooled in 10 minutes and are kept again 45 minutes, dropped again in 10 minutes
Warm to 1000 DEG C are incubated 30 minutes, are cooled to 900 DEG C in 5 minutes again and are kept for 5 minutes, and the advantage of this stage cooling is to protect
The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realized that prepared granularity is more uniform nano level
Chromium carbide, detects through SEM ESEMs, and particle size is about that between 35-40nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of sinking roller of the present embodiment, step is：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, and polishing is entered using 900# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Sinking roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.25mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.0MPa, and sandblasting distance is 90mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ50 μm；
Step 2) spraying：Sprayed with HVOF methods：
The spraying method parameter of NiCrAlY is：Spray tip oxygen flow：1950SCFH；Kerosene oil flow：20.82LPH；
Powder feed rate is：5.0RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Spray tip oxygen flow：1850SCFH；Kerosene oil flow：22.7LPH；
Powder feed rate is：5.0RPM；Spray distance 380mm；
A kind of multi-element alloy coat of sinking roller of the present embodiment, after testing：
Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained
The intensity of coating reaches 103.6MPa；
Coating hardness is analyzed：Measured using Vickers, hardness reaches more than 1350HV,
Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and dried process
Specimen surface.Test solution in paste penetrates into coating porosity, and with parent metal effect, spot of the generation with characteristic color is right
Coloured speckle number is counted on lotion, you can obtain coating porosity, measures porosity 0.87%；
Service life evaluation method：According to high temperature zinc liquid corrosion experiment.Problem manufactures experimently a high temperature zinc liquid corrosion experiment dress
Put, sinking roller sample is placed in being rotated in zinc liquid, to simulate actual Service Environment.Contrast coating is simulated experiment respectively,
Adjust the use time of coating.Or in the case of conditions permit, real work is carried out on small-sized galvanization production line, use the longevity
Life was more than 25 days (current sinking roller usage cycles were about 8~12 days)
During detection, inventor is investigated thermal shock resistance of the coating under 500 DEG C of (every 10min quenchings once) hot conditions
Can, NiCr/Cr3C2-25NiCr coatings are through more than 60 circulations without peeling off.
Strength test：Using E-7 glue as binding agent, stretching experiment is carried out after solidification, with 0.1mm/min rate tensiles,
When tensile strength is 107.5MPa, bonding sample is broken, and the plane of disruption is in glued layer, to show that anchoring strength of coating is more than
107.5MPa。
Embodiment 6
The sinking roller multi-element alloy coat of the present embodiment, basic structure is different and the improvement is that with embodiment 1：
NiCrAl spray layer thickness is 85 μm, and Cr contents are that 20%, Ni contents are 72.5%, and Al content is 7%；NiCr-Cr3C2It is compound
Coating layer thickness is 350 μm, Cr3C2Content is that 80%, NiCr is 20%.
The sinking roller multi-element alloy coat material of the present embodiment prepares：NiCrAl nano powders, NiCr-Cr3C2Mixing nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.20 proportioning is placed in powder
In the distilled water of gross weight 60%, mixing and stirring is in flow-like, compressing in presoma in addition square dies；With
In bulk after the compacting of 1.4Mpa pressure, thickness is depressed into for 2.5cm, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -110 DEG C of anxious jellies in space carries out anxious jelly 90min；
Step 3：It is lyophilized：The anxious presoma for having frozen quickly is transferred in vacuum freeze drying cabin and is freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, intensification slope 2 DEG C/min, 100 DEG C are kept for 35 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 50 minutes, and vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 60 DEG C/min, are kept for 100 minutes, and vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 40 minutes to be kept for 25 minutes, 1100 DEG C are cooled in 10 minutes and are kept again 45 minutes, dropped again in 10 minutes
Warm to 1000 DEG C are incubated 30 minutes, are cooled to 900 DEG C in 5 minutes again and are kept for 5 minutes, and the advantage of this stage cooling is to protect
The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realized that prepared granularity is more uniform nano level
Chromium carbide, detects through SEM ESEMs, and particle size is about that between 30-35nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of sinking roller of the present embodiment, step is：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, and polishing is entered using 900# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Sinking roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.15mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.3MPa, and sandblasting distance is 80mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ40 μm；
Step 2) spraying：Sprayed with HVOF methods：
The spraying method parameter of NiCrAlY is：Spray tip oxygen flow：1950SCFH；Kerosene oil flow：20.82LPH；
Powder feed rate is：5.0RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Spray tip oxygen flow：1850SCFH；Kerosene oil flow：22.7LPH；
Powder feed rate is：5.0RPM；Spray distance 380mm；
Step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 900W, and sweep speed is
550mm/min, 10 × 3mm of spot size.
Contrast test：NiCr/WC-Co coatings, granularity, thickness and technological parameter are identical, obtained NiCr/WC-Co coatings,
Using metallography microscope hardness analysis, as shown in Fig. 2 by interface to facing surface, hardness is 236.5,271.5,361.2,
525.4、608.7、844.7。
The multi-element alloy coat of the present embodiment uses metallography microscope hardness analysis, as shown in figure 3, by interface to surface layer table
Face, hardness is 253.4,334.1,751.2,1004.4,1122.9,1363.3.
Two kinds of coating cross sections hardness multi-point data acquisition arrangement results are as shown in Figure 4, it can be seen that NiCr/ of the invention
Cr3C2- 20NiCr coatings are stepped up by interface to facing surface, microhardness, up to 1363.3HV.
Strength test：Using E-7 glue as binding agent, stretching experiment is carried out after solidification, with 0.1mm/min rate tensiles,
When tensile strength is 115.0MPa, bonding sample is broken, and the plane of disruption is in glued layer, to show that anchoring strength of coating is more than
115.0MPa。
Embodiment 7
The sinking roller multi-element alloy coat of the present embodiment, basic structure is different and the improvement is that with embodiment 1：
NiCrAlY spray layer thickness is 75 μm, and Cr contents are that 20%, Ni contents are 78%, and Al content is that 1%, Y contents are 1%；
NiCr-Cr3C2Composite coating thickness is 300 μm, Cr3C2Content is that 80%, NiCr is 20%.
The sinking roller multi-element alloy coat material of the present embodiment prepares：NiCrAlY nano powders, NiCr-Cr3C2Mixing nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.18 proportioning is placed in powder
In the distilled water of gross weight 60%, mixing and stirring is in flow-like, compressing in presoma in addition square dies；With
In bulk after the compacting of 1.1Mpa pressure, thickness is depressed into for 3cm, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -130 DEG C of anxious jellies in space carries out anxious jelly 100min；
Step 3：It is lyophilized：The anxious presoma for having frozen quickly is transferred in vacuum freeze drying cabin and is freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, intensification slope 2 DEG C/min, 100 DEG C are kept for 40 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 85 DEG C/min, is kept for 50 minutes, and vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 55 DEG C/min, are kept for 120 minutes, and vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 40 minutes to be kept for 25 minutes, 1100 DEG C are cooled in 10 minutes and are kept again 45 minutes, dropped again in 10 minutes
Warm to 1000 DEG C are incubated 30 minutes, are cooled to 900 DEG C in 5 minutes again and are kept for 5 minutes, and the advantage of this stage cooling is to protect
The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realized that prepared granularity is more uniform nano level
Chromium carbide, detects through SEM ESEMs, and particle size is about that between 35-40nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of sinking roller of the present embodiment, step is：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, and polishing is entered using 900# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Sinking roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.20mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.3MPa, and sandblasting distance is 95mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ60 μm；
Step 2) spraying：Sprayed with HVOF methods：
The spraying method parameter of NiCrAlY is：Spray tip oxygen flow：1950SCFH；Kerosene oil flow：20.82LPH；
Powder feed rate is：5.0RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Spray tip oxygen flow：1850SCFH；Kerosene oil flow：22.7LPH；
Powder feed rate is：5.0RPM；Spray distance 380mm；
A kind of multi-element alloy coat of sinking roller of the present embodiment, after testing：
Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained
The intensity of coating reaches 104.2MPa；
Coating hardness is analyzed：Measured using Vickers, hardness reaches more than 1310HV,
Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and dried process
Specimen surface.Test solution in paste penetrates into coating porosity, and with parent metal effect, spot of the generation with characteristic color is right
Coloured speckle number is counted on lotion, you can obtain coating porosity, measures porosity 1.37%；
Coating service life is detected：Real work is carried out on small-sized galvanization production line, service life was more than 30 days.
Embodiment 8
The sinking roller multi-element alloy coat of the present embodiment, basic structure is different and the improvement is that with embodiment 1：
NiCrAlY spray layer thickness is 85 μm, and Cr contents are that 20%, Ni contents are 72.5%, and Al content is that 5.5%, Y contents are
2.0%；NiCr-Cr3C2Composite coating thickness is 450 μm, Cr3C2Content is that 80%, NiCr is 20%.
The sinking roller multi-element alloy coat material of the present embodiment prepares：NiCrAlY nano powders, NiCr-Cr3C2Mixing nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.20 proportioning is placed in powder
In the distilled water of gross weight 60%, mixing and stirring is in flow-like, compressing in presoma in addition square dies；With
In bulk after the compacting of 1.4Mpa pressure, thickness is depressed into for 2.5cm, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -110 DEG C of anxious jellies in space carries out anxious jelly 90min；
Step 3：It is lyophilized：The anxious presoma for having frozen quickly is transferred in vacuum freeze drying cabin and is freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, intensification slope 2 DEG C/min, 100 DEG C are kept for 35 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 50 minutes, and vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 60 DEG C/min, are kept for 100 minutes, and vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 40 minutes to be kept for 25 minutes, 1100 DEG C are cooled in 10 minutes and are kept again 45 minutes, dropped again in 10 minutes
Warm to 1000 DEG C are incubated 30 minutes, are cooled to 900 DEG C in 5 minutes again and are kept for 5 minutes, and the advantage of this stage cooling is to protect
The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realized that prepared granularity is more uniform nano level
Chromium carbide, detects through SEM ESEMs, and particle size is about that between 30-35nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of sinking roller of the present embodiment, step is：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, and polishing is entered using 900# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Sinking roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.15mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.3MPa, and sandblasting distance is 80mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ40 μm；
Step 2) spraying：Sprayed with HVOF methods：
The spraying method parameter of NiCrAlY is：Spray tip oxygen flow：1950SCFH；Kerosene oil flow：20.82LPH；
Powder feed rate is：5.0RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Spray tip oxygen flow：1850SCFH；Kerosene oil flow：22.7LPH；
Powder feed rate is：5.0RPM；Spray distance 380mm；
Step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 1000W, and sweep speed is
550mm/min, 10 × 3mm of spot size.
Embodiment 9
The sinking roller multi-element alloy coat of the present embodiment and its preparation and spraying method, basic structure are different with embodiment 8
With the improvement is that：Spray tip uses the structure of multigroup nozzle 1 as shown in Figure 5, and spray efficiency is high, and spraying is uniform；It is many
Group nozzle 1 is fixed on flared end of the section in the external-open of slurry passage 4 of torch like, and the compression of the neck external-open of slurry passage 4 is empty
Gas inlet pipeline 2, and pressure is adjusted by gas pressure regulating valve 3.
Step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 900W, and sweep speed is
600mm/min, 10 × 3mm of spot size.
Embodiment 10
The sinking roller multi-element alloy coat of the present embodiment and its preparation and spraying method, basic structure are different with embodiment 9
With the improvement is that：Step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 950W, scanned
Speed is 580mm/min, 10 × 3mm of spot size.
As shown in figure 5, there is tapered entrance certain boundling to act on, trunnion design can strengthen the erosion ability of slurry, together
When can also make its more uniformly spreading on spray tip section.Multiinjector design is sprayed using array as shown in Figure 6
Rifle nozzle, slurry is drawn into pipeline through grinding fluid pump, and before spray tip is entered, compressed air stream is entered by neck, produces border
, there is energy and momentum-exchange in the turbulent diffusion effect of layer, can be distributed the slurry taken with grinding fluid pumping mixed slurry and divide
For uniform.Array spray tip can reduce mixed zone (similar to trunnion) length, and injection erosion is kept relatively uniform
Property.
Schematical above that the present invention and embodiments thereof are described, the description does not have restricted, institute in accompanying drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel enlightened by it, in the case where the invention objective is not departed from, is designed and the technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of multi-element alloy coat of sinking roller, it is characterised in that be followed successively by sinking roller basic unit, transition zone and work from inside to outside
Make layer, the transition zone is NiCrAlY sprayed coatings；The working lining is NiCr-Cr3C2Composite coating.
2. sinking roller multi-element alloy coat according to claim 1, it is characterised in that：The NiCrAlY spray layer thickness
It is 50~100 μm；The NiCr-Cr3C2Composite coating thickness is 200~500 μm.
3. the multi-element alloy coat of sinking roller according to claim 2, it is characterised in that：In the NiCrAlY sprayed coatings,
Cr contents are 10~30%, and Al content is 0~7%；Y contents are 1~3%；The NiCr-Cr3C2In composite coating, Cr3C2Contain
Measure is that 70~80%, NiCr is 20~30%.
4. a kind of preparation method of multi-element alloy coat according to any described sinking roller of claims 1 to 3, its feature exists
In：Cr in alloy coat3C2Powder base be nano powder, the Cr3C2The preparation method of nano powder is：
Step one：Mixing：During ammonium dichromate powder and nanometer carbon black powder are placed in into distilled water or deionized water, mix equal
It is even in flow-like, add compressing in presoma in mould；
Step 2：It is anxious to freeze：Presoma is quickly transferred to anxious jelly in space carries out anxious jelly；
Step 3：It is lyophilized：The anxious presoma for having frozen quickly is transferred in vacuum freeze drying cabin and is freezed；
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, intensification carries out carbonizing reduction reaction and nanometer Cr is obtained3C2Powder.
5. the preparation method of the multi-element alloy coat of sinking roller according to claim 4, it is characterised in that：The step one
In, the proportioning of ammonium dichromate and nanometer carbon black powder is 1：(0.17~0.21)；Distilled water or deionized water consumption are：Powder is total
The 55%~60% of weight；It is -100~-140 DEG C suddenly to freeze temperature in step 2, and the time is 30~150min；In step 4, heat up
Carbonizing reduction is carried out to 900~1200 DEG C.
6. the preparation method of the multi-element alloy coat of sinking roller according to claim 4, it is characterised in that：In step 3,
Lyophilized technique curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, intensification slope 2 DEG C/min, 100 DEG C are kept for 30~40 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 80~85 DEG C/min, is kept for 50~60 minutes, and vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 50~65 DEG C/min, are kept for 80~200 minutes, and vacuum control is within 80Pa.
7. a kind of spraying method of the multi-element alloy coat of sinking roller according to claim 6, it is characterised in that step
For：
Step 1) pre-treatment：To be sunk roller surface mechanical grinding, rear blasting treatment；
Step 2) spraying：Sprayed with HVOF methods.
8. the spraying method of the multi-element alloy coat of sinking roller according to claim 7, it is characterised in that the pre-treatment
In, polishing is polished substrate surface using 800#~1000# sand paper, with washes of absolute alcohol, acetone degreasing；By sinking roller
Surface is mechanical grinding to Sa3 grades of cleannes；Blasting treatment is that 0.1~0.5mm iron-sands are abrasive particle, compressed air pressure using particle diameter
Power ＞ 0.8MPa, sandblasting distance is 80~100mm, and sandblasting angle is 20 °, smart rugosity is reached RZ40~70 μm.
9. the spraying method of the multi-element alloy coat of sinking roller according to claim 7, it is characterised in that the HVOF side
In method：
The spraying method parameter of NiCrAlY is：Spray tip oxygen flow：1900~2000SCFH；Kerosene oil flow：20~
21LPH；Powder feed rate is：4.5~5.5RPM；360~380mm of spray distance；
NiCr-Cr3C2Spraying method parameter be：Spray tip oxygen flow：1800~1900SCFH；Kerosene oil flow：22~
23LPH；Powder feed rate is：4.5~5.5RPM；360~380mm of spray distance；
Also include step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 900~1000W, scanning
Speed is 550~600mm/min, 10 × 3mm of spot size.
10. a kind of spraying method spray tip of the multi-element alloy coat of sinking roller according to claim 9, its feature
It is that multigroup nozzle (1) of the spray tip is fixed on horn mouth of the section in slurry passage (4) external-open of torch like
End, slurry passage (4) neck external-open compressed air inlet pipeline (2), and pressure is adjusted by gas pressure regulating valve (3).
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| CN114318206A (en) * | 2021-12-13 | 2022-04-12 | 中船重工龙江广瀚燃气轮机有限公司 | Wear-resistant coating for gas turbine crossfire tube and preparation method thereof |
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Application publication date: 20170707 |