CN110172692B - Method for compositely strengthening self-repairing of surface of cutter head of shield machine - Google Patents
Method for compositely strengthening self-repairing of surface of cutter head of shield machine Download PDFInfo
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- CN110172692B CN110172692B CN201910330984.2A CN201910330984A CN110172692B CN 110172692 B CN110172692 B CN 110172692B CN 201910330984 A CN201910330984 A CN 201910330984A CN 110172692 B CN110172692 B CN 110172692B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005728 strengthening Methods 0.000 title claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 49
- 239000011248 coating agent Substances 0.000 claims abstract description 48
- 239000000843 powder Substances 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 28
- 238000004372 laser cladding Methods 0.000 claims abstract description 14
- 230000008439 repair process Effects 0.000 claims abstract description 10
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 229910021389 graphene Inorganic materials 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000011733 molybdenum Substances 0.000 claims description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims description 13
- HECLRDQVFMWTQS-RGOKHQFPSA-N 1755-01-7 Chemical compound C1[C@H]2[C@@H]3CC=C[C@@H]3[C@@H]1C=C2 HECLRDQVFMWTQS-RGOKHQFPSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- QXYJCZRRLLQGCR-UHFFFAOYSA-N dioxomolybdenum Chemical compound O=[Mo]=O QXYJCZRRLLQGCR-UHFFFAOYSA-N 0.000 claims description 12
- 239000003094 microcapsule Substances 0.000 claims description 12
- 239000005011 phenolic resin Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 229920001568 phenolic resin Polymers 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 10
- 239000003365 glass fiber Substances 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 10
- 239000002041 carbon nanotube Substances 0.000 claims description 9
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 9
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 8
- 239000010428 baryte Substances 0.000 claims description 8
- 229910052601 baryte Inorganic materials 0.000 claims description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 8
- 239000004917 carbon fiber Substances 0.000 claims description 8
- 239000007822 coupling agent Substances 0.000 claims description 8
- 239000010436 fluorite Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 229920002396 Polyurea Polymers 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 239000002086 nanomaterial Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000002557 mineral fiber Substances 0.000 claims description 4
- 239000002105 nanoparticle Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000002775 capsule Substances 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- 238000002144 chemical decomposition reaction Methods 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 claims description 3
- 239000002783 friction material Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000013021 overheating Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000011208 reinforced composite material Substances 0.000 claims description 3
- RSAQARAFWMUYLL-UHFFFAOYSA-N tic-10 Chemical compound CC1=CC=CC=C1CN1C(CCN(CC=2C=CC=CC=2)C2)=C2C(=O)N2CCN=C21 RSAQARAFWMUYLL-UHFFFAOYSA-N 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims 3
- 229910034327 TiC Inorganic materials 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 16
- 238000005507 spraying Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 8
- 238000000227 grinding Methods 0.000 description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 229910052593 corundum Inorganic materials 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
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- 229910001845 yogo sapphire Inorganic materials 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 239000010425 asbestos Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002064 nanoplatelet Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- 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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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Abstract
本发明提供一种盾构机刀盘表面复合强化自修复的方法，通过将刀盘表面的修复粉末激光熔覆进行复合强化，应力退火后保温，然后通过将自修复材料压制在刀盘表面获得自修复外层涂层，通过该方法获得的涂层能够克服盾构机刀盘在使用过程中工作环境复杂、磨损严重频繁修复的问题。The invention provides a method for composite strengthening and self-repairing of the surface of a shield machine cutter head. The repair powder on the cutter head surface is clad with laser cladding for compound strengthening, stress annealed and kept warm, and then the self-healing material is pressed on the cutter head surface. Self-healing outer layer coating, the coating obtained by this method can overcome the problems of complex working environment, serious wear and frequent repair of the shield machine cutter head during use.
Description
Technical Field
The invention relates to the field of cutter repair, in particular to a method for compositely strengthening self-repairing of the surface of a cutter head of a shield machine.
Background
The shield machine is an advanced material manufacturing key technology integrating multiple subjects such as materials, machinery, transmission and the like, marks a national comprehensive advanced manufacturing level, has higher equipment value and higher construction cost, has complex working environment and serious abrasion in the use process of a shield machine cutter head, is generally scrapped and processed when the service life of the shield machine is not enough to continue to a next project after the shield machine finishes one project, but can make the performance of a remanufactured product reach or even exceed that of a new product by a professional repairing or upgrading method through technologies such as a composite surface engineering technology, a nano surface engineering technology and the like under the main melody of constructing a saving society, an environment-friendly society and developing circular economy at present, and has more excellent effects on saving resources and energy and protecting the environment.
The microcapsule self-repairing method is the most applied method in the field of self-repairing coatings at present, microcapsules containing a repairing agent are embedded in a polymer matrix or a coating in advance, when the matrix or the coating material is damaged, the capsules break and release the repairing agent, and when the repairing agent meets a catalyst in the matrix or the coating, a crosslinking curing reaction occurs to repair a crack surface, so that the self-repairing of the damaged part is realized.
The graphene coating has excellent high heat conduction, high temperature resistance and wear resistance, the graphene nanoplatelets can enhance the adhesive force of the coating, so that the graphene coating has excellent wear resistance and scratch resistance, and simultaneously has good heat resistance and heat conductivity, heat generated in the friction process can be quickly dispersed, and chemical degradation caused by local overheating of the surface of the coating is prevented; by adopting a nano particle reinforced composite material technology, the outstanding characteristics of high strength, high modulus, high strength and low friction coefficient of the novel two-dimensional nano material graphene are fully utilized, and the friction and wear properties of the graphene composite material are improved; TiC has very high melting point and hardness, and has good heat transfer performance and electrical conductivity; the carbon nano tube is a material with the highest specific strength which can be prepared at present, other engineering materials are used as a matrix to be made into a composite material together with the carbon nano tube, so that the composite material can show good strength, elasticity, fatigue resistance and isotropy, and the performance of the composite material is greatly improved.
The composite mineral fiber (FKF fiber) is a group of novel reinforcing materials for friction and sealing materials, which comprises various mineral fibers, is supplemented with a small amount of organic fibers and other reinforcing components according to different purposes, has the reinforcing effect which can meet the basic requirements of disc brake pads and drum brake pads, can meet the reinforcing requirements of most rubber and sealing plates, can meet the requirements of the brake pads on friction performance, has heat resistance superior to asbestos and has high cost performance; the glass fiber belongs to inorganic silicate fiber and has the advantages of high strength, corrosion resistance, good thermal stability (capable of stably working below 550 ℃ for a long time), and the like; the glass fiber material has better adhesive property and excellent frictional wear performance after the modified resin, the rubber powder and the like are added.
Disclosure of Invention
The invention aims to provide a method for compounding, strengthening and self-repairing the surface of a cutter head of a shield machine, which solves the problems of complex working environment and serious abrasion of the cutter head of the shield machine in the using process.
The technical scheme of the invention is as follows: a method for compounding, strengthening and self-repairing the surface of a cutter head of a shield machine; the coating obtained by the method can overcome the problems of complex working environment and serious abrasion and frequent repair of the cutter head of the shield machine in the using process; the specific implementation method comprises the following steps:
(1) surface cleaning: removing rust and oil stains on the surface of the cutter head;
(2) repairing surface cracks: uniformly mixing 10-30 parts of nanoscale graphene, 10-30 parts of TiC10, 10-30 parts of carbon nano tube, 10-30 parts of molybdenum dioxide and 10-30 parts of Q235 powder through ultrasonic vibration, spraying the mixture to a cutter abrasion part through a powder feeding nozzle, filling protective gas, heating to 3200-3500 ℃, controlling the laser power to be 1500-2000W, controlling the spot diameter to be 100-150 um and controlling the laser heat treatment time to be 1-1.5 s, and performing laser cladding on the cutter abrasion part for one or more times under the laser irradiation to form a laser cladding graphene-TiC-carbon nano tube-molybdenum dioxide-Q235 micro-sheet layer on the surface of the cutter abrasion part; after cooling the cutter to room temperature, carrying out stress relief annealing by induction heating to 620-640 ℃, keeping the temperature for 2-3 h, and then air cooling to room temperature;
(3) modification of phenolic resin: mixing nano-scale SiO210 to 30 parts of TiO210 to 30 parts of Al2O3Adding 10-30 parts of ZnO powder and 10-30 parts of phenolic resin, and uniformly mixing by ultrasonic vibration to prepare nano modified phenolic resin;
(4) preparing an outer coating: uniformly mixing 20-30 parts of nano modified phenolic resin, 20-30 parts of FKF fibers, 3-6 parts of glass fibers, 3-6 parts of carbon fibers, 3-6 parts of barite, 3-6 parts of ferrochromium mineral powder, 3-6 parts of fluorite powder, 3-6 parts of alpha-alumina, 30-40 parts of KH-550 coupling agent and 30-40 parts of polyurea formaldehyde coated dicyclopentadiene (DCPD) microcapsules through ultrasonic vibration to obtain the FKF composite fiber friction enhanced self-repairing outer layer coating material;
(5) outer layer coating adhesion: spraying the prepared FKF composite fiber friction-enhanced self-repairing outer layer coating material on a repaired laser cladding graphene-TiC-carbon nanotube-molybdenum dioxide-Q235 micro-sheet layer through a spraying machine, then pressing through a pressing machine, wherein the pressing temperature is 160-170 ℃, the pressing pressure is 14-17 MPa, the heat and pressure are maintained for 70-80 s/mm, the temperature is slowly increased to 200-220 ℃, and then the temperature is maintained for 8-10 hours;
(6) grinding: and finally, carrying out grinding processing on the outer coating attached to the cutter head according to the size of the cutter head, and finally obtaining the composite reinforced self-repairing material for the surface of the cutter head of the shield machine after the inspection is qualified.
The invention has the beneficial effects that:
the invention provides a method for compounding, strengthening and self-repairing the surface of a cutter head of a shield machine, which solves the problems of complex working environment, serious abrasion and frequent repair of the cutter head of the shield machine in the using process, and when the service life of the cutter head of the shield machine is not enough to continue to the next project after the shield machine finishes one project, the performance of a remanufactured product can reach or even exceed that of a new product by a method of specialized repair or upgrading modification through technologies such as a compound surface engineering technology, a nano surface engineering technology and the like, thereby avoiding scrapping treatment, and having obvious effects of saving resources and energy and protecting the environment.
The microcapsule added to the production raw materials is to embed the microcapsule containing the repairing agent into a polymer matrix or a coating in advance, when the matrix or the coating material is damaged to generate micro cracks, the stress concentration at the tips of the cracks can lead the capsules to break and release the repairing agent, and when the repairing agent meets a catalyst in the matrix or the coating, a cross-linking curing reaction is generated to repair the crack surfaces, so that the self-repair of the damaged parts is realized.
The graphene-TiC-carbon nanotube-molybdenum dioxide-Q235 powder coating added to the production raw materials has excellent high heat conduction, high temperature resistance and wear resistance, can enhance the adhesive force of the coating, has good heat resistance and heat conductivity, can quickly disperse heat generated in the friction process, and prevents the chemical degradation caused by local overheating of the surface of the coating; by adopting a nano particle reinforced composite material technology, the outstanding characteristics of high strength, high modulus, high strength and low friction coefficient of the novel two-dimensional nano material graphene are fully utilized, and the friction strength, hardness, fatigue resistance and wear resistance of the graphene-TiC-carbon nano tube-molybdenum dioxide-Q235 coating are improved;
the nano-material modified phenolic resin added in the raw materials for production is prepared by adding nano-SiO into the traditional phenolic resin2、TiO2、Al2O3ZnO, composite mineral fiber, glass fiber and carbon fiber are used as reinforcements, barite, chromite powder, fluorite, calcium carbonate and alpha-alumina material are used as friction fillers, KH-550 coupling agent is used as affinity agent, and the nano modified phenolic resin can organically bond all components of the friction material together, endow the material with certain structural strength, greatly influence the friction and wear performance of the material, particularly the high-temperature friction and wear function, and have good pressure resistance.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments
Example 1:
a method for compositely strengthening and self-repairing the surface of a cutter head of a shield machine comprises the following steps:
(1) surface cleaning: removing rust and oil stains on the surface of the cutter head;
(2) repairing surface cracks: uniformly mixing 10 parts of nanoscale graphene, 10 parts of TiC10 parts of carbon nano tube, 10 parts of molybdenum dioxide and 10 parts of Q235 powder through ultrasonic vibration, filling protective gas into a cutter head abrasion part through a powder feeding nozzle, heating to 3200 ℃, wherein the laser power is 1500W, the spot diameter is 100um, the laser heat treatment time is 1s, and carrying out one-time or multiple-time laser cladding on the cutter head abrasion part under the irradiation of laser to form a laser cladding graphene-TiC-carbon nano tube-molybdenum dioxide-Q235 micro-sheet layer on the surface of the cutter head abrasion part; cooling the cutter to room temperature, then carrying out stress relief annealing by induction heating to 620 ℃, preserving heat for 2h, and then air cooling to room temperature;
(3) modification of phenolic resin: mixing nano-scale SiO210 parts of TiO210 parts of Al2O3Adding 10 parts of ZnO powder and 10 parts of ZnO powder into phenolic resin, and uniformly mixing by ultrasonic vibration to prepare nano modified phenolic resin;
(4) preparing an outer coating: uniformly mixing 20 parts of nano modified phenolic resin, 20 parts of FKF fibers, 3 parts of glass fibers, 3 parts of carbon fibers, 3 parts of barite, 3 parts of chromite powder, 3 parts of fluorite powder, 3 parts of alpha-alumina, 30 parts of KH-550 coupling agent and 30 parts of polyurea formaldehyde coated dicyclopentadiene (DCPD) microcapsules together through ultrasonic vibration to obtain an FKF composite fiber friction-enhanced outer self-repairing coating material;
(5) outer layer coating adhesion: spraying the prepared FKF composite fiber friction-enhanced self-repairing outer layer coating material on the repaired laser cladding graphene-TiC-carbon nanotube-molybdenum dioxide-Q235 micro-sheet layer through a spraying machine, then pressing through a pressing machine, wherein the pressing temperature is 160 ℃, the pressing pressure is 14MPa, the heat preservation and pressure maintenance is carried out for 70s/mm, the temperature is slowly increased to 200 ℃, and then the temperature is maintained for 8 hours;
(6) grinding: and finally, carrying out grinding processing on the outer coating attached to the cutter head according to the size of the cutter head, and finally obtaining the composite reinforced self-repairing material for the surface of the cutter head of the shield machine after the inspection is qualified.
Example 2:
(1) surface cleaning: removing rust and oil stains on the surface of the cutter head;
(2) repairing surface cracks: 20 parts of nanoscale graphene, 20 parts of TiC20 parts, 20 parts of carbon nano tube, 20 parts of molybdenum dioxide and 20 parts of Q235 powder are uniformly mixed through ultrasonic vibration and then sprayed to a cutter head abrasion part through a powder feeding nozzle, protective gas is filled in and the temperature is raised to 3300 ℃, the laser power is 1700W, the diameter of a light spot is 130um, the laser heat treatment time is 1.2s, and under the irradiation of laser, one-time or multiple-time laser cladding is carried out on the cutter head abrasion part, so that a laser cladding graphene-TiC-carbon nano tube-molybdenum dioxide-Q235 micro-sheet layer is formed on the surface of the cutter head abrasion part; cooling the cutter to room temperature, then carrying out stress relief annealing by induction heating to 620-640 ℃, keeping the temperature for 2.5h, and then air-cooling to room temperature;
(3) modification of phenolic resin: mixing nano-scale SiO220 parts of TiO220 parts of Al2O3Adding 20 parts of ZnO powder and 20 parts of ZnO powder into phenolic resin, and uniformly mixing by ultrasonic vibration to prepare nano modified phenolic resin;
(4) preparing an outer coating: uniformly mixing 25 parts of nano modified phenolic resin, 25 parts of FKF fibers, 4 parts of glass fibers, 4 parts of carbon fibers, 4 parts of barite, 4 parts of chromite powder, 4 parts of fluorite powder, 4 parts of alpha-alumina, 35 parts of KH-550 coupling agent and 35 parts of polyurea formaldehyde coated dicyclopentadiene (DCPD) microcapsules together through ultrasonic vibration to obtain an FKF composite fiber friction-enhanced outer self-repairing coating material;
(5) outer layer coating adhesion: spraying the prepared FKF composite fiber friction-enhanced self-repairing outer layer coating material on the repaired laser cladding graphene-TiC-carbon nanotube-molybdenum dioxide-Q235 micro-sheet layer through a spraying machine, then pressing through a pressing machine, wherein the pressing temperature is 165 ℃, the pressing pressure is 15MPa, the heat preservation and pressure maintenance is 75s/mm, the temperature is slowly increased to 210 ℃, and then the temperature is maintained for 9 hours;
(6) grinding: and finally, carrying out grinding processing on the outer coating attached to the cutter head according to the size of the cutter head, and finally obtaining the composite reinforced self-repairing material for the surface of the cutter head of the shield machine after the inspection is qualified.
Example 3:
(1) surface cleaning: removing rust and oil stains on the surface of the cutter head;
(2) repairing surface cracks: uniformly mixing 30 parts of nanoscale graphene, 30 parts of TiC30 parts of carbon nano tube, 30 parts of molybdenum dioxide and 30 parts of Q235 powder through ultrasonic vibration, spraying the mixture to a cutter abrasion part through a powder feeding nozzle, filling protective gas, heating to 3500 ℃, controlling the laser power to 2000W, the diameter of a light spot to be 150um and the laser heat treatment time to be 1.5s, and carrying out one-time or multiple-time laser cladding on the cutter abrasion part under the irradiation of laser to form a laser cladding graphene-TiC-carbon nano tube-molybdenum dioxide-Q235 micro-sheet layer on the surface of the cutter abrasion part; cooling the cutter to room temperature, then carrying out stress relief annealing by induction heating to 620-640 ℃, keeping the temperature for 3h, and then air-cooling to room temperature;
(3) modification of phenolic resin: mixing nano-scale SiO230 parts of TiO230 parts of Al2O3Adding 30 parts of ZnO powder and 30 parts of ZnO powder into phenolic resin, and uniformly mixing by ultrasonic vibration to prepare nano modified phenolic resin;
(4) preparing an outer coating: uniformly mixing 30 parts of nano modified phenolic resin, 30 parts of FKF fibers, 6 parts of glass fibers, 6 parts of carbon fibers, 6 parts of barite, 6 parts of ferrochromium ore powder, 6 parts of fluorite powder, 6 parts of alpha-alumina, 40 parts of KH-550 coupling agent and 40 parts of polyurea formaldehyde coated dicyclopentadiene (DCPD) microcapsules together through ultrasonic vibration to obtain an FKF composite fiber friction-enhanced outer self-repairing coating material;
(5) outer layer coating adhesion: spraying the prepared FKF composite fiber friction-enhanced self-repairing outer layer coating material on the repaired laser cladding graphene-TiC-carbon nanotube-molybdenum dioxide-Q235 micro-sheet layer through a spraying machine, then pressing through a pressing machine, wherein the pressing temperature is 170 ℃, the pressing pressure is 17MPa, the heat preservation and pressure maintenance is 80s/mm, the temperature is slowly increased to 220 ℃, and then the temperature is maintained for 10 hours;
(6) grinding: and finally, carrying out grinding processing on the outer coating attached to the cutter head according to the size of the cutter head, and finally obtaining the composite reinforced self-repairing material for the surface of the cutter head of the shield machine after the inspection is qualified.
Claims (5)
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| CN101619156A (en) * | 2008-07-01 | 2010-01-06 | 北京工商大学 | Application of micro-capsule self-repair technology in automobile brake shoe made of composite material |
| CN106757012A (en) * | 2017-01-18 | 2017-05-31 | 燕山大学 | A kind of graphene-containing and titanium carbide self-lubricating wear-resistant coating |
| CN108914117A (en) * | 2018-07-25 | 2018-11-30 | 刘常利 | A kind of intensifying method and cutter head of shield machine of cutter head of shield machine |
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| CN101619156A (en) * | 2008-07-01 | 2010-01-06 | 北京工商大学 | Application of micro-capsule self-repair technology in automobile brake shoe made of composite material |
| CN106757012A (en) * | 2017-01-18 | 2017-05-31 | 燕山大学 | A kind of graphene-containing and titanium carbide self-lubricating wear-resistant coating |
| CN108914117A (en) * | 2018-07-25 | 2018-11-30 | 刘常利 | A kind of intensifying method and cutter head of shield machine of cutter head of shield machine |
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