CN116334524A - Preparation method of self-lubricating ceramic matrix composite coating - Google Patents
Preparation method of self-lubricating ceramic matrix composite coating Download PDFInfo
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- CN116334524A CN116334524A CN202211686937.XA CN202211686937A CN116334524A CN 116334524 A CN116334524 A CN 116334524A CN 202211686937 A CN202211686937 A CN 202211686937A CN 116334524 A CN116334524 A CN 116334524A
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- 238000000576 coating method Methods 0.000 title claims abstract description 53
- 239000011248 coating agent Substances 0.000 title claims abstract description 51
- 239000011153 ceramic matrix composite Substances 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000005524 ceramic coating Methods 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 239000010702 perfluoropolyether Substances 0.000 claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 239000000919 ceramic Substances 0.000 claims abstract description 12
- 239000010687 lubricating oil Substances 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000005498 polishing Methods 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 10
- 229910002080 8 mol% Y2O3 fully stabilized ZrO2 Inorganic materials 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 238000005488 sandblasting Methods 0.000 claims abstract description 9
- 229910001233 yttria-stabilized zirconia Inorganic materials 0.000 claims abstract description 8
- 239000003822 epoxy resin Substances 0.000 claims abstract description 7
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 7
- 230000007704 transition Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000004519 grease Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000227 grinding Methods 0.000 abstract description 2
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 238000004506 ultrasonic cleaning Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
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- 238000005461 lubrication Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
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- 239000011148 porous material Substances 0.000 description 2
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- 230000002633 protecting effect Effects 0.000 description 2
- 231100000241 scar Toxicity 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
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Classifications
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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
- C23C4/134—Plasma spraying
-
- 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
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds only
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements
-
- 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
-
- 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
-
- 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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/1003—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds used as base material
-
- 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
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/72—Extended drain
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/08—Solids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (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)
Abstract
The invention discloses a preparation method of a self-lubricating ceramic matrix composite coating, which comprises the following steps: step one: performing sand blasting treatment on the metal substrate to roughen the surface of the metal substrate, and performing ultrasonic cleaning in acetone for about 20min; step two: firstly spraying a NiCrAlY transition layer on the surface of a metal substrate, and then spraying a ceramic coating; step three: grinding and polishing the 8YSZ coating, and carrying out texturing treatment on the surface of the ground and polished ceramic coating by adopting a laser surface texturing technology to prepare a porous structure; step four: dispersing a proportion of perfluoropolyether (PFPE) lubricating oil into epoxy resin, and then coating the epoxy resin on the surface of the textured ceramic coating; step five: and (3) polishing the sample prepared in the step four to remove more resin adhered to the surface of the coating, and finally obtaining the ceramic-based (8 YSZ) composite coating with self-lubricating property. The invention has the technical effects of exhibiting excellent tribological properties and effectively prolonging the service life of the ceramic coating.
Description
Technical Field
The invention relates to the technical field of material surface modification, in particular to a preparation method of a self-lubricating ceramic matrix composite coating.
Background
The continuous improvement of the comprehensive performance requirements of materials and the continuous deterioration of the working condition environments of related components lead to serious abrasion of metal materials and premature failure of equipment, and the failure of mechanical parts at key parts can cause disastrous results, so that the problems of lubrication and abrasion resistance of moving parts under extreme working conditions become bottlenecks affecting the reliability and service life of a mechanical system. At present, a great amount of advanced technical equipment greatly improves the performance requirements of high precision, high efficiency, high reliability, long service life and the like, the requirements of self-lubricating wear-resistant materials breaking through the original performance limit and the preparation technology are urgent, and the research on special lubricating wear-resistant materials with excellent performance is also more and more important. Ceramic has received increasing attention as a protective coating for mechanical parts, but the inherent brittleness and lack of lubricity of ceramic coatings severely limit the wide application of such coatings to friction parts.
In the preparation technology of various ceramic coatings, the central temperature of jet flow of A Plasma Spraying (APS) process is higher than 10000 ℃, so that all materials with physical melting points can be melted, and the preparation technology has outstanding superiority in the aspect of spraying ceramic coatings. However, the ceramic coating has a high friction factor, and it is difficult to achieve oil-free lubrication. To reduce the friction factor of the ceramic coating and achieve effective lubrication between friction pairs, it is necessary to form a stable and effective low shear strength lubricating film on the friction surfaces.
Therefore, the lubricant is introduced into the ceramic coating to prepare the self-lubricating ceramic composite coating with excellent tribological performance, which has very important engineering application value and innovation significance in the field of improving the tribology of the thermal spraying ceramic coating.
Disclosure of Invention
The invention aims to provide a preparation method of a self-lubricating ceramic matrix composite coating, so as to realize the technical effects proposed in the background technology.
In order to achieve the above purpose, the invention provides the following technical scheme: the preparation method of the self-lubricating ceramic matrix composite coating comprises the following steps:
step one: performing sand blasting treatment on the metal substrate to roughen the surface of the metal substrate, ultrasonically cleaning the metal substrate in acetone for about 20min, and removing fine sand particles, grease and other impurities remained in the sand blasting process;
step two: firstly spraying a NiCrAlY transition layer with the thickness of 70-90 mu m on the surface of a metal substrate, and then spraying a ceramic coating, wherein the thickness of the ceramic coating is controlled to be 250-300 mu m;
step three: performing polishing treatment on the 8YSZ coating, and performing texturing treatment on the polished ceramic coating surface by adopting a laser surface texturing technology to prepare a porous structure so as to obtain a ceramic-based (8 YSZ) coating;
step four: dispersing a certain proportion of perfluoropolyether (PFPE) lubricating oil into epoxy resin, mechanically stirring uniformly, and then coating the mixture on the surface of the textured ceramic coating;
step five: and (3) polishing the sample prepared in the step four to remove more resin adhered to the surface of the coating, and finally obtaining the ceramic-based (8 YSZ) composite coating with self-lubricating property.
Preferably, the laser surface texture technology in the third step prepares a specific porous structure on the surface of the polished ceramic coating, and the shape, size and density of the texturing treatment are controllable.
Preferably, the roughness Ra of the surface roughening treatment of the metal substrate is 1.41 to 1.43 μm.
Compared with the prior art, the invention has the beneficial effects that: according to the preparation method of the self-lubricating ceramic matrix composite coating, PFPE lubricating oil is dispersed in epoxy resin and then is introduced into the ceramic coating, the resin has fixing and protecting effects on the lubricating oil, volatilization, loss and the like of the PFPE lubricating oil in the use process are reduced, the self-lubricating ceramic matrix composite coating disclosed by the invention shows excellent tribological performance, and the service life of the ceramic coating is effectively prolonged.
Drawings
FIG. 1 is a SEM topography of the textured ceramic coating surface (a) and section (b) after introduction of PFPE;
FIG. 2 is a graph of the friction factor curve (a) and wear rate (b) of a composite coating;
fig. 3 is an SEM topography of the wear surface of the coating before (a) and after (b) lubricant introduction.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In a first embodiment of the present invention,
the preparation method of the self-lubricating ceramic matrix composite coating comprises the following steps:
step one: performing sand blasting treatment on the metal substrate to roughen the surface of the metal substrate, ultrasonically cleaning the metal substrate in acetone for about 20min, and removing fine sand particles, grease and other impurities remained in the sand blasting process;
step two: firstly spraying a NiCrAlY transition layer with the thickness of 70-90 mu m on the surface of a metal substrate, and then spraying a ceramic coating, wherein the thickness of the ceramic coating is controlled to be 250-300 mu m;
step three: performing polishing treatment on the 8YSZ coating, and performing texturing treatment on the polished ceramic coating surface by adopting a laser surface texturing technology to prepare a porous structure so as to obtain a ceramic-based (8 YSZ) coating;
in this embodiment, the laser surface texturing technology in the third step prepares a specific porous structure on the surface of the polished ceramic coating, and the shape, size and density of the texturing treatment are controllable.
In this example, the roughness Ra of the surface roughening treatment of the metal base material is 1.41-1.43 μm.
In a second embodiment of the present invention,
the preparation method of the self-lubricating ceramic matrix composite coating comprises the following steps:
step one: performing sand blasting treatment on the metal substrate to roughen the surface of the metal substrate, ultrasonically cleaning the metal substrate in acetone for about 20min, and removing fine sand particles, grease and other impurities remained in the sand blasting process;
step two: firstly spraying a NiCrAlY transition layer with the thickness of 70-90 mu m on the surface of a metal substrate, and then spraying a ceramic coating, wherein the thickness of the ceramic coating is controlled to be 250-300 mu m, so as to obtain a ceramic-based (8 YSZ) coating;
step three: grinding and polishing the 8YSZ coating, and carrying out texturing treatment on the surface of the ground and polished ceramic coating by adopting a laser surface texturing technology to prepare a porous structure;
step four: dispersing a certain proportion of perfluoropolyether (PFPE) lubricating oil into epoxy resin, mechanically stirring uniformly, and then coating the mixture on the surface of the textured ceramic coating;
step five: and (3) polishing the sample prepared in the step four to remove more resin adhered to the surface of the coating, and finally obtaining the ceramic-based (8 YSZ) composite coating with self-lubricating property.
In this embodiment, the laser surface texturing technology in the third step prepares a specific porous structure on the surface of the polished ceramic coating, and the shape, size and density of the texturing treatment are controllable.
In this example, the roughness Ra of the surface roughening treatment of the metal base material is 1.41-1.43 μm.
And testing and analyzing the tribological performance of the prepared coating by adopting a CSM reciprocating type ball disc friction tester. All tests were carried out at room temperature (temperature 25.+ -. 5 ℃ C., humidity 30.+ -. 5%), test speed, amplitude and sliding distance were 10 cm. S, respectively -1 2.5mm and 400m, the load is 10N, and the dual ball adopts Al with the diameter of 6mm 2 O 3 Ceramic balls, and the abrasion volume of the coating is measured by a non-contact three-dimensional profiler; the test results are shown in Table 1.
TABLE 1 Friction wear Properties of ceramic-based coatings at room temperature
Performance test of ceramic matrix composite coating:
pits textured on the surface of the 8YSZ coating were completely filled with PFPE lubricant dispersed resin fig. 1 (a), and pores were also found in the filled PFPE dispersed resin, which is where PFPE lubricant was concentrated, PFPE exposed to air was volatile or removed during polishing, cleaning, leaving partially visible pores, but the smoothness and flatness of the entire coating surface were significantly improved. In addition, the combination of the resin and the texture pits of the 8YSZ coating is very tight, and no shrinkage clearance is generated, so that the 8YSZ coating can fully play the lubrication function while ensuring the strength of the coating in the friction process. As can be seen from the cross-sectional view of fig. 1 (b), the PFPE lubricant-dispersed resin can completely infiltrate the bottom of the textured pits of the ceramic coating.
As can be seen from the friction factor curve and wear rate of fig. 2, the raw ceramic coating reached a steady state friction factor curve after a short run-in period, but the friction factor curve had a significant fluctuation course. The composite coating shows very excellent tribological performance due to the synergistic effect of the lubricants, and has small friction factor and very stable friction curve. In addition, the improvement of wear rate after the PFPE lubricating oil is introduced into the ceramic coating is also very obvious, and compared with the 8YSZ coating, the wear rate of the composite coating is reduced by about 2 orders of magnitude as shown in FIG. 2 (b). The wear scar surface of the original ceramic coating is very rough, with large flaking off as seen in fig. 3 (a); whereas the wear scar surface of the composite coating is smoother and a slight abrasive wear appears as in fig. 3 (b).
The technical effects are as follows: according to the preparation method of the self-lubricating ceramic matrix composite coating, PFPE lubricating oil is dispersed in epoxy resin and then is introduced into the ceramic coating, the resin has fixing and protecting effects on the lubricating oil, volatilization, loss and the like of the PFPE lubricating oil in the use process are reduced, the self-lubricating ceramic matrix composite coating disclosed by the invention shows excellent tribological performance, and the service life of the ceramic coating is effectively prolonged.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (3)
1. A preparation method of a self-lubricating ceramic matrix composite coating is characterized by comprising the following steps: the method specifically comprises the following steps:
step one: performing sand blasting treatment on the metal substrate to roughen the surface of the metal substrate, ultrasonically cleaning the metal substrate in acetone for about 20min, and removing fine sand particles, grease and other impurities remained in the sand blasting process;
step two: firstly spraying a NiCrAlY transition layer with the thickness of 70-90 mu m on the surface of a metal substrate, and then spraying a ceramic coating, wherein the thickness of the ceramic coating is controlled to be 250-300 mu m;
step three: performing polishing treatment on the 8YSZ coating, and performing texturing treatment on the polished ceramic coating surface by adopting a laser surface texturing technology to prepare a porous structure so as to obtain a ceramic-based (8 YSZ) coating;
step four: dispersing a certain proportion of perfluoropolyether (PFPE) lubricating oil into epoxy resin, mechanically stirring uniformly, and then coating the mixture on the surface of the textured ceramic coating;
step five: and (3) polishing the sample prepared in the step four to remove more resin adhered to the surface of the coating, and finally obtaining the ceramic-based (8 YSZ) composite coating with self-lubricating property.
2. The method for preparing the self-lubricating ceramic matrix composite coating according to claim 1, wherein the method comprises the following steps: and step three, preparing a specific porous structure on the surface of the polished ceramic coating by the laser surface texturing technology, wherein the shape, the size and the density of texturing treatment are controllable.
3. The method for preparing the self-lubricating ceramic matrix composite coating according to claim 1, wherein the method comprises the following steps: the roughness Ra of the surface roughening treatment of the metal substrate is 1.41-1.43
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