CN108796356A - A kind of preparation method of the spheroidal graphite cast-iron product with composite layer - Google Patents
A kind of preparation method of the spheroidal graphite cast-iron product with composite layer Download PDFInfo
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- CN108796356A CN108796356A CN201810765251.7A CN201810765251A CN108796356A CN 108796356 A CN108796356 A CN 108796356A CN 201810765251 A CN201810765251 A CN 201810765251A CN 108796356 A CN108796356 A CN 108796356A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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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
- C23C4/18—After-treatment
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Abstract
The invention discloses a kind of preparation methods of the spheroidal graphite cast-iron product with composite layer, and steps are as follows：Step 1 designs the chemical composition of spheroidal graphite cast-iron；Obtained spheroidal graphite cast-iron article surface is cleaned and is polished by step 2, removes remained on surface dirt；Step 3, in spheroidal graphite cast-iron product in 4wt% picric acid ethanol solutions etch 15-30s, then take out clean up surface, drying；Step 4 designs the ingredient of oxide mixed raw material, and above-mentioned oxide mixed raw material is sprayed into spheroidal graphite cast-iron article surface using supersonic flame spraying, whole that 2-4h is sintered at 950-980 DEG C after keeping the temperature 0.5-1h, obtains required composite material.By improving the composition of protective oxide film raw material and the chemical composition of spheroidal graphite cast-iron itself, corroding to form uniform flour milling in spheroidal graphite cast-iron article surface in the present invention; the composite material combined closely can be formed both to make; the grade for improving spheroidal graphite cast-iron surfacecti proteon, to greatly improve the service life of spheroidal graphite cast-iron.
Description
Technical field
The invention belongs to metallic composite fields, and in particular to a kind of preparation of the spheroidal graphite cast-iron product with composite layer
Method.
Background technology
Cast iron is a kind of iron-carbon alloy, it is characterized in that phosphorus content is high, the mass percentage of carbon is more than 2%, also contains
The impurity elements such as more silicon, manganese, phosphorus, sulphur.It is spread out in cast iron and largely exists with the graphite of carbide or free state, also
Minute quantity is solid-solution in ferrite.Graphite lattice types in cast iron are simple hexagoinal lattice, and the atomic distance in basal plane is
0.142nm, binding force is stronger, but the interplanar distance between two basal planes is 0.340nm, and binding force is weak, therefore the basal plane of graphite is very
It is easy sliding, intensity, hardness, plasticity and wilful polar region often exist with lamellar morphology.Graphite in spheroidal graphite cast-iron is spherical
, intensity and toughness higher than other cast irons such as gray cast iron there is excellent castability, high damping and amortization, good cutting to add
Work, and compared with the steel of similar performance, the price with relative moderate, therefore obtain widely answer in the industry
With, such as bent axle, camshaft, hot roll wearing piece, often using spheroidal graphite cast-iron manufacture, the dosage in manufacturing industry occupies all
The second of metal material.Spheroidal graphite cast-iron also makes ductile cast iron, graphite therein play the part of the role of crack arrester, makes it have excellent
Different human nature and ductility.The diversity of spheroidal graphite cast-iron is adapted for more applying, it is considered to be the substitute of steel, but due to
Globular graphite is embedded in iron-based body so that the intensity of iron-based body is discontinuous, and globular graphite is crackle under shock loading
Source be easy to cause the cracking of matrix.
Although ductile cast iron material have corresponding advantage and disadvantage, due to its advantages --- with iron essence,
The performance of steel, antiseptic property are excellent, ductility is good, very extensive application have still been obtained in industrial circle, especially in pipe
Road transport field is an advantage over the first choice of the metal material of plastic conduit, from installation convenience and from the point of view of safeguarding cost, has superior
Cost performance.But ductile cast iron material also has the shortcomings that the general character of ferrous material --- with the passage surface meeting of service life
Gradually it is corroded.Currently, for ductile iron pipeline material anti-corrosion using it is more be to be prevented using cement mortar coating
Rotten or macromolecule protective coating carries out anti-corrosion.Means of defence in the prior art still exists anti-although using more
Between sheath and nodular iron casting the problem of binding force and protective layer with usage time passage protective capacities tomography decline
The problem of, the above problem is solved there is no effective method so far.
Invention content
In order to solve the deficiencies in the prior art, the present invention provides a kind of using protective oxide film to spheroidal graphite cast-iron
The method that article surface is protected provides the preparation method between a kind of spheroidal graphite cast-iron with composite layer.
Institute of the invention technique effect to be achieved is realized by following scheme：
A kind of preparation method of the spheroidal graphite cast-iron product with composite layer provided in the present invention, includes the following steps：
Step 1, the chemical composition and mass percent for designing spheroidal graphite cast-iron are：C3.85-3.92%,Si1.5-1.7%,
Mo0.55-0.60%、P≤0.02%、S≤0.02%、Cr≤0.02%、B0.015-0.023%、Mn0.3-0.5%、Cu0.7-0.9%、
Sn0.02-0.03%, Ni1.0-1.15%, V0.03-0.045%, surplus are iron and the impurity not being avoided that；The spheroidal graphite cast-iron
Raw material mainly use the pig iron and steel scrap, remaining using molybdenum-iron, red copper, ferrochrome, ferromanganese, vanadium iron；By the original of spheroidal graphite cast-iron
Induction furnace melting is utilized after material mixing, spheroidal graphite cast-iron product is made；
Obtained spheroidal graphite cast-iron article surface is cleaned and is polished by step 2, removes remained on surface dirt；
Step 3, in spheroidal graphite cast-iron product in 4wt% picric acid ethanol solutions etch 15-30s, then take out and clean up table
Face, drying；
Step 4, the ingredient and mass percent for designing oxide mixed raw material are：ZrO215-18%、HfO23-5%、Cr2O31-
2%、SiO214-16%、MnO23-7%, BaO0.5-0.9%, CuO0.1-0.3%, surplus Al2O3；Utilize supersonic flame spraying
Above-mentioned oxide mixed raw material is sprayed into spheroidal graphite cast-iron article surface, it is whole that 2- is sintered at 950-980 DEG C after keeping the temperature 0.5-1h
4h obtains required composite material.
Technology path in the present invention is：The higher spheroidal graphite cast-iron of design surface energy, handling the surface of spheroidal graphite cast-iron makes it
Surface, which has, is easy to compound characteristic, then oxide protective layer is sprayed into the surface of ductile cast iron material, keeps the two close
In conjunction with forming new composite material.It is improved first against the chemical composition of spheroidal graphite cast-iron, makes ductile cast iron material more
Anti-corrosion, surface energy higher is suitable for being used as the raw material in composite material.First to the ingredient of spheroidal graphite cast-iron into
Row adaptability is allocated.Suitable nodular cast iron tissue in order to obtain, it is necessary to which then suitable element is added for selection.In the present invention
It selects Si, Mo, Mn, Cu, Ni as main alloy addition element, while adulterating a small amount of B, Sn and V, further, control
P, the content of S, Cr.In master alloying addition element in the present invention, suitable Si and Ni being capable of joint effect spheroidal graphite cast-iron meltings
Graphited process in the process can reduce the critical-temperature of austenite transformation, expand austenitic area, can also reduce eutectoid point
Phosphorus content, have the function of strongly stablize and refinement pearlite.Cu can promote to be graphitized in eutectic transformation, reduce Ovshinsky
The critical-temperature of body transformation, promotes the formation of pearlite, advantageous to the formation for reducing or eliminating free cementite, promotes spheroidal graphite
The toughness of cast iron, Mo then can obviously refine pearlite, promote the intensity and quenching degree of spheroidal graphite cast-iron, the cooperation addition of Cu and Mo
It can strengthen and refine the ferrite in pearlite and pearlite simultaneously, so that the intensity and hardness of spheroidal graphite cast-iron have
It is obviously improved.From it will be evident that B, Sn and V are dissolved into the microstructure of spheroidal graphite cast-iron, ball can be promoted in actual production
The wearability and quenching degree of black cast iron, but additive amount should not be excessive, especially the content of B need to be strict controlled in 0.015-
In 0.023% range, harmful effect otherwise is generated to the comprehensive mechanical property of spheroidal graphite cast-iron, can make macroscopical toughness that cliff of displacement formula be presented
Decline.The addition of Sn is then conducive to promote spheroidal graphite cast-iron article surface energy, so that it is more easy to compound with oxide skin(coating) progress.
Spheroidal graphite cast-iron product passes through cleaning and polishing removal remained on surface dirt after the completion of preparing, then invaded using picric acid
It loses liquid and carries out etch, so that spheroidal graphite cast-iron surface is formed the surface with certain roughness, finally spray to form oxygen using oxide
Compound protective layer.The combination of oxides used in the present invention is with Al2O3Based on mixed oxide composition, only with Al2O3Make
The binding force between spheroidal graphite cast-iron surface and bad, and sintering temperature are confirmed in practice for the raw material of protective oxide film
Height, oxide layer easily cause the variation of spheroidal graphite cast-iron interior tissue to have adverse effect on during being sintered.The present invention
In in Al2O3On the basis of be added to the higher ZrO of transparency2And compatible HfO therewith2, Zr and Hf is congeners,
With similar atomic structure, can mutually fill to form close pile structure promotion oxide skin(coating) between atom during oxidesintering
Compactness extent.Meanwhile Cr2O3、MnO2Addition can effectively reduce sintering temperature, SiO2, BaO, CuO mixing addition
Sintering temperature can not only be then reduced, and oxide layer can be made more closely to be adhered to spheroidal graphite cast-iron surface.It should be noted
It is that the ingredient and used in amounts of oxide skin(coating) are strictly controlled, the change of one-component or various ingredients cannot bring this
Technique effect in invention.
In untreated spheroidal graphite cast-iron surface direct spraying protective oxide film although can also form oxide skin(coating),
It is after long-time use, the binding force between oxide skin(coating) and spheroidal graphite cast-iron can be smaller and smaller, is susceptible to oxide skin(coating) and falls off
Or the case where peeling off, after being handled using etch, binding force between the two is then substantially improved, in practice it has proved that composite material is in ball
It can be closely attached to spheroidal graphite cast-iron surface in black cast iron materials service life.
Further, in step 1, spheroidal graphite cast-iron smelting temperature is 1480-1500 DEG C.
Further, in step 1, the nodulizer that spheroidal graphite cast-iron melting uses is FeSiMg8Re7, nodulizer Adding Way
To pour method.
Further, in step 2, cleaning process uses aqueous cleaning agent.Cleaning process preferably uses aqueous cleaning agent,
Environmental protection and noresidue, organic principle is easily remained using organic washing agent, and carbonization is easy in the spraying process of subsequent oxidation nitride layer
Carbon residual is formed, to influence the combination degree between oxide skin(coating) and spheroidal graphite cast-iron surface.
Further, in step 2, it is polishing to spheroidal graphite cast-iron article surface roughness Ra≤1 μm.The reduction of roughness has
Help etch process to carry out on spheroidal graphite cast-iron surface with being more uniformly distributed.
Further, in step 3, the ferric trichloride and 0.2- of 0.05wt% are also added in the picric acid ethanol solution
The glycerine of 0.3wt%.Ferric trichloride helps to form uniform pit-hole on spheroidal graphite cast-iron surface, to make oxide skin(coating) go deep into
Enter spheroidal graphite Cast Iron Surface, and the addition of glycerine then contributes to inhibit due to being added to caused by ferric trichloride in spheroidal graphite cast-iron table
Face forms excessively deep point corrosion pit, avoids the formation of hot spot between oxide skin(coating) and spheroidal graphite cast-iron layer.
Further, in step 3, the oxalic acid of 0.01-0.02wt% is also added in the picric acid ethanol solution.Oxalic acid energy
Enough generations for further promoting etch process, promote the efficiency of erosion process.
Further, in step 4, the particle size range of oxide mixed raw material is 0.5-1 μm.
Further, in step 4, the thickness of oxidesintering layer is 500-2000 μm.
The present invention has the following advantages：
The present invention provides a kind of methods protected to spheroidal graphite cast-iron article surface using protective oxide film, provide one
Preparation method between spheroidal graphite cast-iron of the kind with composite layer.In the present invention by improve protective oxide film raw material composition and
The chemical composition of spheroidal graphite cast-iron itself corrodes to form uniform flour milling in spheroidal graphite cast-iron article surface, can be formed both to make
The composite material combined closely improves the grade of spheroidal graphite cast-iron surfacecti proteon, to greatly improve the use of spheroidal graphite cast-iron
Service life should be particularly suitable for comprising the composite material of spheroidal graphite cast-iron in the Anti-corrosion design of industrial liquid-transport pipe-line.
Specific implementation mode
With reference to embodiment, the present invention will be described in detail.
First, prepare spheroidal graphite cast-iron, using the pig iron and steel scrap, remaining using molybdenum-iron, red copper, ferrochrome, ferromanganese, vanadium iron into
Row casting, above-mentioned raw material are all made of commercially available material, and the wherein mass ratio of the pig iron and steel scrap is 8：1.
The casting method of specific spheroidal graphite cast-iron product is as follows：
Select corresponding raw material will be former under the conditions of 1480-1500 DEG C using intermediate frequency furnace melting according to composition design
Material is smelted into melt（It, or can in other experiments in production using the medium-sized smelting furnace of 50kg in the embodiment of the present invention
The corresponding induction furnace using different model carries out melting, and temperature control is in melting temperature range）；It, will using method processing is poured
After casting ladle drying, FeSiMg8Re7 nodulizers are put into casting ladle, nodulizer additive amount is the 1.7% of spheroidal graphite cast-iron material quality,
Then the Antaciron FeSi90Al1.5 powder for being 1mm in its surface covering average particle size, after the completion of melting, works as former material
Expect that melt temperature test result is more than 1480 DEG C, then pour immediately in 80% melt to casting ladle, until being rushed again after the completion of spheroidizing reacion
Enter remaining raw material melt.
In this step, other commercially available nodulizers to match can also be used in nodulizer, and addition also can be according to reality
The variation of situation carries out the adjustment of adaptability.The type and dosage of coverture Antaciron can similarly be carried out according to actual conditions
The adjusting of adaptability, preferably FeSi90Al1.5, FeSi75Al0.5-A, FeSi75Al0.5-B, FeSi75Al1.5-A,
One or more of FeSi75Al1.5-B, FeSi65, FeSi45 all may be used.After the completion of above-mentioned steps, addition accounts for raw material matter
The CBSALLOY inovulants of amount 0.6% are once bred, and are come out of the stove and are poured into a mould under the conditions of 1460 DEG C, pouring temperature 1420
DEG C, spheroidal graphite cast-iron product is made.Inovulant grain graininess used in the step is 0.1mm.Between above-mentioned spheroidal graphite cast-iron
In manufacturing method, the processing step provided using specialized vocabulary is the prior art, as in " pouring method " and spheroidal graphite cast-iron casting process
Breed, be all the description in the prior art to cast iron process technique, the invention being not intended as due to the prior art in the present invention
Point, therefore be not added with repeat herein, but the foundation of essential features description should not be lacked in this, as the present invention.
The nodular cast iron pipe fittings of 10 batches, tubular length 20cm are prepared using above-mentioned casting method, outer diameter is
4.5cm, internal diameter 3cm.It is as follows that constituent content mensure result is carried out using oxygen-nitrogen analyzer and ICP emission spectrometers（Test knot
Fruit is the mass percent of corresponding element）：
Obtained nodular cast iron pipe fittings are cleaned using the aqueous cleaning agent of commercial cast iron class, are polishing to spheroidal graphite using sand paper
Cast iron article surface roughness Ra≤1 μm removes remained on surface dirt, is dried after then deionized water being utilized to rinse.
Prepare etching solution：By picric acid, ferric trichloride, glycerine and dissolving oxalic acid in ethyl alcohol, wherein picric acid quality hundred
Point content is 4wt%, ferric trichloride 0.05wt%, glycerine 0.24wt%, oxalic acid 0.015wt%.Etching solution is stirred evenly,
Then spheroidal graphite cast-iron product is dipped in wherein（Room temperature, 25 DEG C）20s then takes out and is sprayed to surface without residual using deionized water
It stays, dry.
By the spraying of the nodular cast iron pipe fittings progress oxide skin(coating) after above-mentioned processing, it is as follows：
1. the ingredient and mass percent that design oxide mixed raw material are：ZrO218%、HfO24%、Cr2O31.8%、
SiO214.1%、MnO26%, BaO0.9%, CuO0.24%, surplus Al2O3。
2. oxide mixed raw material is ground, it is 0.5 μm to make mixed raw material average particle size.
Above-mentioned oxide mixed raw material is sprayed into spheroidal graphite cast-iron article surface using supersonic flame spraying, keeps the temperature 1h
Afterwards, whole that 2.5h is sintered at 960 DEG C, required composite material is obtained, the thickness of oxidesintering layer is 1200 μm, the oxygen prepared
Compound layer is fine and close and is bonded closely with nodular cast iron pipe fittings.
The composite material every batch of that the pipe fitting of above-mentioned 10 batches is prepared is randomly selected into 10PCS and amounts to 100PSC placements
Neutral salt spray test is done in salt spray test chamber, experimental result is：It tests more than the ball with protective oxide film after 10000h
Black cast iron is not any change, and spheroidal graphite cast-iron matrix also without any the phenomenon that detaching, and is compareed therewith with oxide skin(coating)
Have there is apparent signs of corrosion in the nodular cast iron pipe fittings for not carried out oxide layer protection in embodiment, and corrosion rate reaches
It is another that 1.21mm/ is more up to using the control group corrosion rate of commercially available nodular cast iron pipe fittings to 0.24mm/.
As can be seen from the above-described embodiment, pass through the composition and spheroidal graphite cast-iron of improvement protective oxide film raw material in the present invention
The chemical composition of itself corrodes to form uniform flour milling in spheroidal graphite cast-iron article surface, can be formed and be combined closely both to make
Composite material, improve the grade of spheroidal graphite cast-iron surfacecti proteon, to greatly improve the service life of spheroidal graphite cast-iron, the packet
Composite material containing spheroidal graphite cast-iron is particularly suitable in the Anti-corrosion design of industrial liquid-transport pipe-line.
Finally, it should be noted that above example be only to illustrate the embodiment of the present invention technical solution rather than to its into
Row limitation, although the embodiment of the present invention is described in detail with reference to preferred embodiment, those skilled in the art
It should be understood that the technical solution of the embodiment of the present invention can be still modified or replaced equivalently, and these are changed or wait
The range of modified technical solution disengaging technical solution of the embodiment of the present invention cannot also be made with replacement.
Claims (9)
1. a kind of preparation method of the spheroidal graphite cast-iron product with composite layer, it is characterised in that include the following steps：
Step 1, the chemical composition and mass percent for designing spheroidal graphite cast-iron are：C3.85-3.92%,Si1.5-1.7%,
Mo0.55-0.60%、P≤0.02%、S≤0.02%、Cr≤0.02%、B0.015-0.023%、Mn0.3-0.5%、Cu0.7-0.9%、
Sn0.02-0.03%, Ni1.0-1.15%, V0.03-0.045%, surplus are iron and the impurity not being avoided that；The spheroidal graphite cast-iron
Raw material mainly use the pig iron and steel scrap, remaining using molybdenum-iron, red copper, ferrochrome, ferromanganese, vanadium iron；By the original of spheroidal graphite cast-iron
Induction furnace melting is utilized after material mixing, spheroidal graphite cast-iron product is made；
Obtained spheroidal graphite cast-iron article surface is cleaned and is polished by step 2, removes remained on surface dirt；
Step 3, in spheroidal graphite cast-iron product in 4wt% picric acid ethanol solutions etch 15-30s, then take out and clean up table
Face, drying；
Step 4, the ingredient and mass percent for designing oxide mixed raw material are：ZrO215-18%、HfO23-5%、Cr2O31-
2%、SiO214-16%、MnO23-7%, BaO0.5-0.9%, CuO0.1-0.3%, surplus Al2O3；Utilize supersonic flame spraying
Above-mentioned oxide mixed raw material is sprayed into spheroidal graphite cast-iron article surface, it is whole that 2- is sintered at 950-980 DEG C after keeping the temperature 0.5-1h
4h obtains required composite material.
2. the preparation method of the spheroidal graphite cast-iron product with composite layer as described in claim 1, it is characterised in that：In step 1,
Spheroidal graphite cast-iron smelting temperature is 1480-1500 DEG C.
3. the preparation method of the spheroidal graphite cast-iron product with composite layer as described in claim 1, it is characterised in that：In step 1,
The nodulizer that spheroidal graphite cast-iron melting uses is FeSiMg8Re7, and nodulizer Adding Way is to pour method.
4. the preparation method of the spheroidal graphite cast-iron product with composite layer as described in claim 1, it is characterised in that：In step 2,
Cleaning process uses aqueous cleaning agent.
5. the preparation method of the spheroidal graphite cast-iron product with composite layer as described in claim 1, it is characterised in that：In step 2,
It is polishing to spheroidal graphite cast-iron article surface roughness Ra≤1 μm.
6. the preparation method of the spheroidal graphite cast-iron product with composite layer as described in claim 1, it is characterised in that：In step 3,
The ferric trichloride of 0.05wt% and the glycerine of 0.2-0.3wt% are also added in the picric acid ethanol solution.
7. the preparation method of the spheroidal graphite cast-iron product with composite layer as claimed in claim 6, it is characterised in that：In step 3,
The oxalic acid of 0.01-0.02wt% is also added in the picric acid ethanol solution.
8. the preparation method of the spheroidal graphite cast-iron product with composite layer as described in claim 1, it is characterised in that：In step 4,
The particle size range of oxide mixed raw material is 0.5-1 μm.
9. the preparation method of the spheroidal graphite cast-iron product with composite layer as described in claim 1, it is characterised in that：In step 4,
The thickness of oxidesintering layer is 500-2000 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810765251.7A CN108796356B (en) | 2018-07-12 | 2018-07-12 | Preparation method of nodular cast iron part with composite layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810765251.7A CN108796356B (en) | 2018-07-12 | 2018-07-12 | Preparation method of nodular cast iron part with composite layer |
Publications (2)
| Publication Number | Publication Date |
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| CN108796356A true CN108796356A (en) | 2018-11-13 |
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| CN112501542A (en) * | 2020-11-26 | 2021-03-16 | 安徽瑞泰新材料科技有限公司 | Steel ball for wear-resistant corrosion-resistant ball mill and preparation method thereof |
| CN116240448A (en) * | 2022-12-26 | 2023-06-09 | 湖南长红铸造有限公司 | Nodular cast iron with composite layer and preparation method and application thereof |
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| CN116240448B (en) * | 2022-12-26 | 2024-12-17 | 湖南长红铸造有限公司 | Nodular cast iron with composite layer and preparation method and application thereof |
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