CN114016014A - Porous high-temperature self-lubricating wear-resistant coating and preparation method thereof - Google Patents
Porous high-temperature self-lubricating wear-resistant coating and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 94
- 239000011248 coating agent Substances 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000000314 lubricant Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 13
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 238000010288 cold spraying Methods 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 6
- 239000010439 graphite Substances 0.000 claims abstract description 6
- 229910001120 nichrome Inorganic materials 0.000 claims abstract description 6
- 238000007781 pre-processing Methods 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 16
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 230000001680 brushing effect Effects 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- 238000003760 magnetic stirring Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000000992 sputter etching Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 11
- 230000001050 lubricating effect Effects 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005461 lubrication Methods 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000010963 304 stainless steel Substances 0.000 description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004372 laser cladding Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
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- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910003470 tongbaite Inorganic materials 0.000 description 2
- 229910017356 Fe2C Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910009817 Ti3SiC2 Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
- C10M103/06—Metal compounds
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/065—Sulfides; Selenides; Tellurides
- C10M2201/066—Molybdenum sulfide
- C10M2201/0663—Molybdenum sulfide used as base material
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Coating By Spraying Or Casting (AREA)
- Lubricants (AREA)
Abstract
The invention discloses a porous high-temperature self-lubricating wear-resistant coating and a preparation method thereof, and provides the porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof aiming at the problems that a machined part is damaged due to surface friction, and the wear-resistant coating is easy to generate thermal action in the traditional processing process. The specific method of the invention is as follows: (1) preprocessing the parts, sending Cr3C2-NiCr powder into a cold spraying spray gun, fixing the parts in front of the spray gun, spraying and ultrasonically cleaning; (2) preparing WS2, graphite and a binder in proportion, and repeatedly and uniformly coating the mixture on the surface of the porous wear-resistant coating to ensure that lubricating particles enter pores; (3) the coated substrate is dried in the shade at room temperature to obtain the lubricating wear-resistant coating. The porous self-lubricating wear-resistant coating with low friction, high load and long service life prepared by the invention can be used for mechanical processing lubrication. The method has the advantages of simple preparation process, no thermal influence, lubricant storage, abrasive dust storage and long service life of the coating.
Description
Technical Field
The invention relates to a porous high-temperature self-lubricating wear-resistant coating and a preparation method thereof, belonging to the technical field of self-lubricating wear-resistant coating materials.
Background
In the mechanical processing process, the surface contact of parts generates friction, the friction can cause abrasion, the surface shape and size of parts are slowly and continuously damaged, and in addition, a large amount of friction heat and abrasive dust generated in the friction process are not beneficial to the exertion of the lubricating effect of the lubricant. Therefore, the surface wear of the parts is often reduced by preparing hard wear-resistant coatings on the surfaces of suitable friction pairs. However, although the conventional wear-resistant coating has good wear resistance, the friction coefficient is high, and a large amount of friction heat is generated in the sliding process, which is not favorable for the service life of parts.
Chinese patent literature, publication No. CN113215564A, published as 8.6.2021, an iron-based wear-resistant composite material and a preparation method thereof, wherein a wear-resistant composite coating is prepared on the surface of an iron-based alloy matrix material by a laser cladding method; performing enhancement treatment on the surface of the iron-based wear-resistant composite coating by adopting laser impact; carrying out circulating heat treatment on the complex with the surface subjected to laser shock to eliminate residual stress; the problems of uneven stress and easy cracking of the coating are solved, and the service life of the coating is prolonged. But the coating has no obvious effect on reducing friction heat and abrasive dust.
Chinese patent document, publication No. CN113106443A, published as 2021, 7 months and 13 days, discloses 304 stainless steel coated with self-lubricating wear-resistant composite coating and a preparation method thereof, wherein a laser cladding technology is adopted to laser clad Co-based alloy and Ti on 35CrMo steel3SiC2The powder is mixed, and cobalt is used as a toughening phase, so that the hardness, wear resistance and corrosion resistance of the composite coating are improved; ternary lubricant Ti3SiC2TiC and Cr are formed in the cladding process7C3、Fe2C and other ceramic particles make up the defect of low hardness of 304 stainless steel, and improve the self-lubricating property of the coating; the Cu metal powder improves the wear-resisting and antifriction effects of the 304 stainless steel, thereby improving the wear-resisting property and the lubricating property of the coating in a wider temperature range. This coating has some lubrication but does not significantly account for the improvement in frictional heat and abrasive dust.
Chinese patent document No. CN110724915A, published as 2020, 1, 24, discloses a method for preparing a microtextured coated tool for dry cutting, which comprises pretreating the tool, arraying microtextured array patterns with gradient depth on the back tool face of the tool by femtosecond laser, and coating the surface of the tool by PVD arc process, thereby solving the problem of storing abrasive dust of the coated tool, having certain cooling and lubricating capability and prolonging the service life of the tool. The coating has beneficial effects on the formation of frictional heat and the accommodation of abrasive dust in the cutting process of the cutter to a certain extent, but the coating easily generates heat action in the processing process, so that the problems of oxidation, component burning loss, grain growth, component segregation and the like are caused, and the processing technology is complex.
Disclosure of Invention
The invention aims at solving the problems that in the machining process, the surface of a part is contacted to generate frictional wear, a large amount of frictional heat and abrasive dust are generated, the service life of the mechanical part is shortened, even the mechanical part is damaged, and the product quality is influenced. In addition, the method aims at the problems of oxidation, component burning loss, grain growth, component segregation and the like caused by the easy generation of thermal action of common thermal processing technologies such as thermal spraying, laser cladding and the like in the traditional processing process of the wear-resistant coating. The invention provides a porous high-temperature self-lubricating wear-resistant coating and a preparation method thereof. The porous wear-resistant coating is prepared by a cold spraying technology, a layer of lubricant is coated on the coating, the lubricant can be stored in the porous shape of the coating, abrasive dust is contained, and the service life of mechanical parts is prolonged. The technical scheme for realizing the purpose of the invention is as follows:
specifically, the porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof are characterized by comprising the following steps:
step (1), preprocessing a part to be processed;
step (2), feeding the coating material powder into a cold spraying spray gun, and fixing the parts in front of the spray gun;
step (3), performing a coating process on the surface of the part through a cold spraying process;
step (4), ultrasonically cleaning the sprayed coating substrate;
step (5), preparing a solid lubricant:
using solid WS2The powder is used as a lubricant and contains a certain amount of binder;
step (6), coating a solid lubricant coating:
uniformly coating the solid lubricant containing the binder on the surface of the porous wear-resistant coating, and repeatedly brushing to ensure that lubricant particles enter pores;
and (7) drying the coated coating substrate in the shade at room temperature in a dark place.
Further, the parts involved in step (1) are parts generating reciprocating sliding friction, such as a cutter and the like.
Further, the parts involved in the step (1) are parts generating circular sliding friction, such as drills and the like.
Further, the pretreatment in the step (1) comprises ultrasonic cleaning, sand blasting and ion etching of the substrate before spraying
Further, the coating material involved in the step (2) is Cr3C2-NiCr alloy powder with purity of 99.99% and particle size of 500-800 nm.
Further, the cold spraying process parameters in the step (3) are that the nitrogen pressure is 2-3 MPa, the spraying distance is 15-25 mm, the moving speed of a spray gun is 25-35 mm/s, the overlapping quantity of adjacent passes is 2-4 mm, the spraying temperature is 400-500 ℃, and the thickness of the coating is 20-30 mu m.
Further, the cleaning in the step (4) is acetone and alcohol ultrasonic cleaning for 10-20 min.
Further, the solid lubricant prepared in the step (5) comprises the following components in percentage by mass: WS with particle size less than or equal to 2 mu m and purity of 98%2: 25-45%; graphite: 10-25%, binder: 50-60%; surfactant (b): 0 to 5 percent; inhibitor (B): 0 to 5 percent.
Further, in the step (5), the proportioned lubricant is stirred and mixed uniformly by magnetic force, and the parameters of the magnetic stirring are as follows: the temperature is 50-70 ℃, the rotating speed is 700-1000 r/min, and the time is 2-3 hours.
Further, uniformly brushing the uniformly stirred lubricant on the surface of the porous wear-resistant coating in the step (6), and repeatedly brushing for 5-8 times to ensure that lubricant particles enter pores.
Has the advantages that: the invention provides a porous high-temperature self-lubricating wear-resistant coating and a preparation method thereof, aiming at solving the problems that the traditional wear-resistant coating has poor antifriction effect, generates a large amount of friction heat and abrasive dust, causes short service life of a die and poor quality of a formed part, and causes the problems of oxidation, component burning loss, component segregation, environmental pollution and the like due to the thermal action of the hot-processed coating in the coating processing process. The beneficial effects are that:
the cold spraying process has the advantages of no heat effect, no heat influence on the substrate and the coating, high spraying speed, high bonding strength, low energy consumption, no environmental pollution and the like.
2, the Cr of the invention3C2The NiCr coating has the characteristics of high strength, wear resistance, corrosion resistance and the like, and the nickel-chromium phase has corrosion resistance and is used as a binding phase to bind uniformly distributed chromium carbide particles; while the chromium carbide phase provides the coating with excellent wear resistance.
3. The Cr of the invention3C2The NiCr coating is a porous wear-resistant coating, the pores of the coating can play a role in storing lubricant and containing abrasive dust similar to a surface microtexture, and the coating has obvious positive effects of reducing friction, reducing friction heat, containing abrasive dust and preventing abrasive wear.
4. The composite solid lubricant of the invention adopts WS2Optimal combination of graphite, binder, surfactant, etc., to fully exploit WS2The performance of frictional wear can be reduced, the binder can enable the solid lubricant to be better combined with the matrix, and the lubricating layer is ensured to be uniform and not damaged.
5. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof are suitable for surface lubrication treatment of parts such as reciprocating sliding friction and circulating sliding friction, have the advantages of green lubrication and no pollution, and avoid damage to the environment caused by the adoption of a traditional lubrication mode.
Drawings
FIG. 1 is a sectional view of a porous high-temperature self-lubricating wear-resistant coating prepared in example 1
FIG. 2 is a top view of the porous high-temperature self-lubricating wear-resistant coating prepared in example 1
FIG. 3 is a graph of the friction coefficient of the reciprocating sliding of the porous high-temperature self-lubricating wear-resistant coating prepared in examples 1, 2 and 3
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The embodiment 1 of the porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof comprises the following steps:
the method comprises the following steps of (1) respectively ultrasonically cleaning a substrate in acetone and alcohol solution for 10-20 min, taking out parts, drying the parts, carrying out sand blasting and ion etching on a machined surface of the parts, fixing the substrate on a machining table by using a clamp, and placing the substrate right in front of a cold spraying spray gun;
step (2) of adding Cr3C2-NiCr material powder feeding cold sprayingCoating a spray gun, wherein the purity is 99.99%, the granularity is 500-800 nm, the parts are fixed in front of the spray gun, and the processing surface is opposite to the spray gun;
and (3) adjusting a cold spraying spray gun, setting the nitrogen pressure to be 2 MPa, the spraying distance to be 20 mm, the moving speed of the spray gun to be 30 mm/s, the overlapping quantity of adjacent passes to be 2 mm, the spraying temperature to be 450 ℃, and the thickness of the coating to be 20-30 microns.
And (4) putting the substrate into acetone and alcohol solution, respectively carrying out ultrasonic cleaning for 10-20 min to ensure that no redundant loose particles exist on the surface of the coating, and drying.
FIG. 1 is a sectional view of a porous high-temperature self-lubricating wear-resistant coating prepared in example 1
FIG. 2 is a top view of the porous high-temperature self-lubricating wear-resistant coating prepared in example 1
The embodiment 2 of the porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof comprises the following steps:
the procedure of example 1 was repeated in the same manner as in steps (1-4).
Step (5), preparing a solid lubricant, wherein the solid lubricant comprises the following components in percentage by mass: WS with particle size less than or equal to 2 mu m and purity of 98%2: 30 percent; graphite: 15%, binder: 50 percent; surfactant (b): 3 percent; inhibitor (B): 2 percent; and magnetically stirring the mixed lubricant at the temperature of 60 ℃ and the rotating speed of 850r/min for 2 h.
And (6) uniformly brushing the uniformly stirred lubricant on the surface of the porous wear-resistant coating by using a brush, and repeatedly brushing for 5-8 times to ensure that lubricant particles enter pores.
And (7) drying the coated coating substrate in the shade at room temperature in a dark place.
Embodiment 3 of the porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof of the invention comprises the following steps:
the procedure of example 1 was repeated in the same manner as in steps (1-4).
Step (5), preparing a solid lubricant, wherein the solid lubricant comprises the following components in percentage by mass: WS with particle size less than or equal to 2 mu m and purity of 98%2: 38 percent; graphite: 7%, binder: 50 percent; surfactant (b): 3 percent; inhibitor (B): 2 percent; magnetically stirring the mixed lubricant at the temperature of 6 DEG CThe rotation speed is 850r/min at 0 ℃ and the time is 2 h.
And (6) uniformly brushing the uniformly stirred lubricant on the surface of the porous wear-resistant coating by using a brush, and repeatedly brushing for 5-8 times to ensure that lubricant particles enter pores.
And (7) drying the coated coating substrate in the shade at room temperature in a dark place.
And analyzing the tribological performance of the coating by using a UMT ball-disc type friction tester. The experiment selects phi =5mm GCr15 rolling bearing steel balls with the hardness of 65HRC, the reciprocating sliding speed of 5mm/s and the load of 80N. FIG. 3 is a graph of the friction coefficient of the reciprocating sliding of the porous high-temperature self-lubricating wear-resistant coating prepared in examples 1, 2 and 3.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (11)
1. A porous high-temperature self-lubricating wear-resistant coating and a preparation method thereof are characterized by comprising the following steps:
(1) preprocessing a part to be processed;
(2) feeding the coating material powder into a cold spraying spray gun, and fixing the parts in front of the spray gun;
(3) performing a coating process on the surface of the part through a cold spraying process;
(4) ultrasonically cleaning the sprayed coating substrate;
(5) preparing a solid lubricant:
using solid WS2The powder is used as a lubricant and contains a certain amount of binder;
(6) coating a solid lubricant coating:
uniformly coating the solid lubricant containing the binder on the surface of the porous wear-resistant coating, and repeatedly brushing to ensure that lubricant particles enter pores;
(7) and (3) drying the coated substrate in the shade at room temperature.
2. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof according to claim 1, wherein the parts involved in the step (1) are parts generating reciprocating sliding friction, such as cutters and the like.
3. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof in claim 1, wherein the parts involved in the step (1) are parts generating circulating sliding friction, such as drills and the like.
4. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof according to claim 1, wherein the pretreatment in the step (1) comprises ultrasonic cleaning, sand blasting and ion etching of the substrate before spraying.
5. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof according to claim 1, wherein the coating material involved in the step (2) is Cr3C2-NiCr alloy powder.
6. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof as claimed in claim 1 or 4, wherein the cold spraying process parameters in the step (3) are that the nitrogen pressure is 2-3 MPa, the spraying distance is 15-25 mm, the moving speed of the spray gun is 25-35 mm/s, the overlapping amount of adjacent passes is 2-4 mm, the spraying temperature is 400-500 ℃, and the coating thickness is 20-30 μm.
7. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof according to claim 1 or 6, wherein the cleaning in the step (4) is acetone and alcohol ultrasonic cleaning for 10-20 min.
8. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof according to claim 1, wherein the solid lubricant prepared in the step (5) comprises WS2Graphite, binder, surfactant and inhibitor.
9. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof according to claim 1 or 8, wherein the proportioned lubricant is uniformly mixed in step (5) by magnetic stirring, and the magnetic stirring parameters are as follows: the temperature is 50-70 ℃, the rotating speed is 700-1000 r/min, and the time is 2-3 hours.
10. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof in claim 1 or 7, wherein the method for applying the lubricant on the surface of the porous wear-resistant coating in the step (6) is brush coating.
11. The porous high-temperature self-lubricating wear-resistant coating and the preparation method thereof according to claim 1 or 10, wherein the coated substrate in the step (7) is dried in the shade at room temperature in a dark place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111168533.7A CN114016014A (en) | 2021-10-08 | 2021-10-08 | Porous high-temperature self-lubricating wear-resistant coating and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115287648B (en) * | 2022-08-04 | 2023-11-07 | 沈阳大陆激光工程技术有限公司 | Wide-temperature-range laser cladding wear-resistant material and application thereof |
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