Wear-resistant coating, preparation method thereof, workpiece and treatment method of workpiece

Abstract

The invention provides a wear-resistant coating, a preparation method thereof, a workpiece and a treatment method of the workpiece. The wear-resistant coating comprises polysilazane resin and auxiliary materials, the auxiliary materials comprise the following components in parts by weight: 1-10 parts of an active filler, 5-50 parts of a structural filler, 10-70 parts of a solvent and 0.1-2 parts of a dispersing aid; and the polysilazane resin accounts for 20-40% of the weight of the wear-resistant coating. According to the preparation method disclosed by the invention, the active filler, the structural filler, the solvent and the dispersing aid are crushed and mixed in a ball milling manner, and then are uniformly mixed with the polysilazane resin, so that the wear-resistant coating prepared by the method disclosed by the invention has the characteristics of good wear resistance and strong adhesive force; and the problem that the silicon nitride ceramic coating is easy to crack can be effectively solved through the cooperative use of the polysilazane resin and the auxiliary materials.

Description

Technical Field

[0001] The present application relates to the technical field of protective coatings, and in particular to a wear-resistant coating and a preparation method thereof, a workpiece and a processing method thereof. Background Art

[0002] The machinery industry uses wear-resistant functional coating technology to perform metal surface coating treatment on key mechanical parts such as high-speed trains, turbine and engine impellers, ship propellers, turbine generator blades and ship decks, which can improve the wear resistance, hardness and service life of mechanical equipment.

[0003] As a new type of coating, polysilazane can adhere closely to smooth substrates such as metals, minerals, glass, ceramics and organic materials. The cured film has excellent properties such as high hardness, hydrophobicity and oleophobicity, corrosion resistance, UV transparency, thermal stability and heat resistance. Therefore, it has broad application prospects in the fields of hydrophobicity, corrosion resistance and antifouling, temperature resistance, high-temperature ceramics and non-stick coatings. At the same time, polysilazane, as a ceramic precursor resin, can obtain silicon oxide, silicon nitride and silicon carbide ceramics after pyrolysis. However, the coating with a single polysilazane component has the disadvantages of poor wear resistance and easy cracking after pyrolysis. Summary of the invention

[0004] The present application provides a wear-resistant coating and a preparation method thereof, a workpiece and a processing method thereof, so as to solve the problem that a coating with a single polysilazane component has poor wear resistance and is prone to cracks after pyrolysis.

[0005] In a first aspect, the present application provides a wear-resistant coating, including a polysilazane resin and auxiliary materials;

[0006] The auxiliary materials include, by weight: 1 to 10 parts of active filler, 5 to 50 parts of structural filler, 10 to 70 parts of solvent, and 0.1 to 2 parts of dispersing aid;

[0007] The polysilazane resin accounts for 20 to 40% of the weight of the wear-resistant coating.

[0008] The wear-resistant coating provided by the present application has the following beneficial effects:

[0009] 1) The wear-resistant coating of the present application is toughened by adding active lubricating fillers and toughened silicon nitride whiskers and glass fiber powder fillers to the polysilazane system, thereby solving the defect of easy cracking of the silicon nitride ceramic coating and giving it excellent wear resistance.

[0010] 2) The raw materials of the wear-resistant coating of the present application are easy to obtain and have the characteristics of being easy to produce.

[0011] Optionally, the polysilazane includes at least one of an organic polysilazane or a perhydropolysilazane.

[0012] Optionally, the active filler includes a wear-resistant lubricating material;

[0013] The wear-resistant lubricating material includes at least one of boron nitride, MoS2, graphite powder, graphene, Mxene, and WS2.

[0014] Optionally, the structural filler includes at least one of glass powder, low-melting point glass powder, glass fiber powder, silicon oxide, silicon nitride, silicon carbide, mica powder, and talc powder.

[0015] Optionally, the solvent includes at least one of n-hexane, n-octane, dichloromethane, ethyl ether, n-butyl ether, toluene, xylene, acetone, methyl ethyl ketone, cyclohexanone, butyl acetate, and ethyl acetate.

[0016] In a second aspect, the present application provides a method for preparing a wear-resistant coating, comprising the following steps:

[0017] a) adding 1 to 10 parts of active filler, 5 to 50 parts of structural filler, 10 to 70 parts of solvent and 0.1 to 2 parts of dispersing aid into a grinding device and ball milling at a speed of 400 to 500 rpm for 5 to 10 hours to obtain a filler dispersion with a particle size of ≤160 mesh;

[0018] b) adding the polysilazane resin to the filler dispersion under stirring at 200-300 rpm, stirring for 0.5-1 hour to obtain a wear-resistant coating, wherein the mass proportion of the polysilazane resin in the wear-resistant coating is 20-40%.

[0019] The preparation method of the wear-resistant coating provided in this application has the following beneficial effects:

[0020] 1) The method of the present application crushes and mixes the active filler, structural filler, solvent, and dispersing aid by ball milling, thereby obtaining a filler dispersion with finer particles and improving the compatibility between the above components.

[0021] 2) The method of the present application can prepare the wear-resistant coating through processes such as ball milling and stirring, and its operation is simple and the preparation conditions are mild, so it is easy to implement.

[0022] In a third aspect, the present application provides a workpiece processing method, comprising the following steps:

[0023] a) performing surface cleaning treatment on the workpiece to be coated to obtain a clean workpiece;

[0024] b) uniformly applying the wear-resistant coating provided by any one of the first aspects above to the surface of a clean workpiece;

[0025] c) curing the workpiece coated with the wear-resistant coating to obtain a pre-treated workpiece with a pre-cured layer on the surface, wherein the thickness of the pre-cured layer is 10 to 30 μm;

[0026] d) placing the pretreated workpiece in a muffle furnace for pyrolysis to obtain a workpiece with a wear-resistant coating on the surface.

[0027] The workpiece processing method provided by the present application has the following beneficial effects:

[0028] 1) In the method of the present application, the workpiece of the pre-cured layer is pyrolyzed by a gradient heating method, which can make the pre-cured layer completely ceramicized, the coating has good thermal stability and excellent adhesion, and can be used in harsh environments such as high temperature and high pressure.

[0029] 2) The thickness of the pre-cured layer applied by the method of the present application is 10 to 30 μm, and the coating thickness is relatively thin, which has the characteristic of saving coating material. On the other hand, it also illustrates the excellent protective performance of the wear-resistant coating of the present application.

[0030] Optionally, the curing operation includes: placing the workpiece coated with the wear-resistant coating in an environment with a temperature of 100 to 300° C. and drying it for 0.5 to 3 hours.

[0031] Optionally, the pyrolysis conditions include: in an air atmosphere, heating to 300° C. at a rate of 1 to 10° C. / min, and keeping the temperature for 0.5 to 3 h;

[0032] Then, heat up to 500-600°C at a rate of 1-10°C / min and keep warm for 0.5-3h;

[0033] Finally, the temperature is raised to 700-800°C at a rate of 1-10°C / min and kept at this temperature for 0.5-3h.

[0034] In a fourth aspect, the present application provides a workpiece, the workpiece comprising a workpiece body and a wear-resistant coating fixed to a surface of the workpiece body;

[0035] The thickness of the wear-resistant coating is 8 to 28 μm

[0036] The workpiece provided in the present application has a wear-resistant coating fixed on its surface, and its beneficial effects are as described in the workpiece processing method provided in the third aspect above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 It is a schematic diagram of the coating film appearance of Examples 6 to 9 and Comparative Examples 3 to 5 of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0040] In a first aspect, the present application provides a wear-resistant coating, including a polysilazane resin and auxiliary materials;

[0041] The auxiliary materials include, by weight: 1 to 10 parts of active filler, 5 to 50 parts of structural filler, 10 to 70 parts of solvent, and 0.1 to 2 parts of dispersing aid;

[0042] The polysilazane resin accounts for 20 to 40% of the weight of the wear-resistant coating.

[0043] In the present application, the dispersant may be one or more of BYK-154, BYK-021, BYK-028, and BYKJET-9175.

[0044] In this application, polynitrogen silane is a type of polymer with Si-N as the main chain. Due to the particularity of its chemical structure, it can be converted into SiCN, SiCNO or silicon dioxide ceramics under high temperature conditions. Active fillers in the coating, such as boron nitride, MoS2, graphite powder, graphene, Mxene, WS2, etc., react under high temperature conditions, and some of them will form new covalent bonds with polynitrogen silane, thereby "embedded" in the cross-linked ceramic system formed by polynitrogen silane, introducing new molecules to the newly formed cross-linked system, and in the pyrolysis process, polynitrogen silane ceramics and the dense film formed by the interaction between the active filler molecules newly introduced into the system can greatly improve its wear resistance.

[0045] During the pyrolysis process, the structural fillers in the coating will partially fuse with the ceramicized polynitrogen silane, and some of the structural fillers will exist in the coating after pyrolysis in the form of whiskers and other structures in their original form. Therefore, the presence of structural fillers can enhance the toughness of the coating to a certain extent.

[0046] The wear-resistant coating provided by the present application has the following beneficial effects:

[0047] 1) The wear-resistant coating of the present application is toughened by adding active lubricating fillers and toughened silicon nitride whiskers and glass fiber powder fillers to the polysilazane system, thereby solving the defect of easy cracking of the silicon nitride ceramic coating and giving it excellent wear resistance.

[0048] 2) The raw materials of the wear-resistant coating of the present application are easy to obtain and have the characteristics of being easy to produce.

[0049] Optionally, the polysilazane includes at least one of an organic polysilazane or a perhydropolysilazane.

[0050] In the present application, the organic polysilazane is, for example, one or more of vinyl polysilazane, methyl polysilazane, propargyl polysilazane, polysiloxysilazane, and N-methyl polysilazane. The molecular weight of the polysilazane resin is 2000-3000.

[0051] Optionally, the active filler includes a wear-resistant lubricating material;

[0052] The wear-resistant lubricating material includes at least one of boron nitride, MoS2, graphite powder, graphene, Mxene, and WS2.

[0053] In the present application, the active filler plays the role of anti-wear and lubrication.

[0054] Optionally, the structural filler includes at least one of glass powder, low-melting point glass powder, glass fiber powder, silicon oxide, silicon nitride, silicon carbide, mica powder, and talc powder.

[0055] In the present application, the structural filler plays a supporting role. The addition of the structural filler can support the coating, enhance the adhesion between the coating and the coated surface, and improve the wall hanging performance of the coating on the sprayed and treated surface.

[0056] Optionally, the solvent includes at least one of n-hexane, n-octane, dichloromethane, ethyl ether, n-butyl ether, toluene, xylene, acetone, methyl ethyl ketone, cyclohexanone, butyl acetate, and ethyl acetate.

[0057] In a second aspect, the present application provides a method for preparing a wear-resistant coating, comprising the following steps:

[0058] a) adding 1 to 10 parts of active filler, 5 to 50 parts of structural filler, 10 to 70 parts of solvent and 0.1 to 2 parts of dispersing aid into a grinding device and ball milling at a speed of 400 to 500 rpm for 5 to 10 hours to obtain a filler dispersion with a particle size of ≤160 mesh;

[0059] b) adding the polysilazane resin to the filler dispersion under stirring at 200-300 rpm, stirring for 0.5-1 hour to obtain a wear-resistant coating, wherein the mass proportion of the polysilazane resin in the wear-resistant coating is 20-40%.

[0060] The preparation method of the wear-resistant coating provided in this application has the following beneficial effects:

[0061] 1) The method of the present application crushes and mixes the active filler, structural filler, solvent, and dispersing aid by ball milling, thereby obtaining a filler dispersion with finer particles and improving the compatibility between the above components.

[0062] 2) The method of the present application can prepare the wear-resistant coating through processes such as ball milling and stirring, and its operation is simple and the preparation conditions are mild, so it is easy to implement.

[0063] In a third aspect, the present application provides a workpiece processing method, comprising the following steps:

[0064] a) performing surface cleaning treatment on the workpiece to be coated to obtain a clean workpiece;

[0065] In the present application, the cleaning treatment of the workpiece surface includes the processes of sandblasting and rust removal, solvent washing, and drying the workpiece surface in sequence.

[0066] Sandblasting: In this application, the workpiece surface can be sandblasted with 100-200 mesh copper ore sand, quartz sand, corundum, iron sand, sea sand, etc. The sandblasting distance is 80-120 mm (the distance between the spray gun and the workpiece). The surface roughness of the workpiece is Rz=50-70 μm.

[0067] Solvent washing can use organic solvents such as acetone, gasoline, ethanol, etc. to wash the workpiece to remove organic pollutants on the surface of the workpiece to avoid the presence of dirt affecting the adhesion of the coating when the workpiece is coated later.

[0068] Drying, which is the process of removing the solvent from the surface of the workpiece after solvent washing, can be carried out by air drying, baking, etc.

[0069] b) uniformly applying the wear-resistant coating provided by any one of the first aspects above to the surface of a clean workpiece;

[0070] When applying paint to the surface of the workpiece, spraying, brushing, dipping and other methods can be used. For example, when spraying, a spray gun can be used to evenly spray the workpiece at a distance of 15 to 30 cm from the workpiece to ensure that a layer of paint can be evenly attached to the surface of the workpiece.

[0071] c) curing the workpiece coated with the wear-resistant coating to obtain a pre-treated workpiece with a pre-cured layer on the surface, wherein the thickness of the pre-cured layer is 10 to 30 μm;

[0072] Optionally, the curing operation includes: placing the workpiece coated with the wear-resistant coating in an environment with a temperature of 100 to 300° C. and drying it for 0.5 to 3 hours.

[0073] In the present application, the purpose of the curing operation is to remove the solvent in the coating by heating so that the coating can adhere to the surface of the workpiece and avoid the adverse consequences of blistering and cracking of the coating during the subsequent pyrolysis.

[0074] d) placing the pretreated workpiece in a muffle furnace for pyrolysis to obtain a workpiece with a wear-resistant coating on the surface.

[0075] Optionally, the pyrolysis conditions include: in an air atmosphere, heating to 300° C. at a rate of 1 to 10° C. / min, and keeping the temperature for 0.5 to 3 h;

[0076] Then, heat up to 500-600°C at a rate of 1-10°C / min and keep warm for 0.5-3h;

[0077] Finally, the temperature is raised to 700-800°C at a rate of 1-10°C / min and kept at this temperature for 0.5-3h.

[0078] In the present application, the staged pyrolysis process can completely ceramicize the pre-cured layer, thereby forming a dense and stable protective coating on the surface of the workpiece, thereby improving the protective effect and service life of the coating.

[0079] The workpiece processing method provided by the present application has the following beneficial effects:

[0080] 1) In the method of the present application, the workpiece of the pre-cured layer is pyrolyzed by a gradient heating method, which can make the pre-cured layer completely ceramicized, the coating has good thermal stability and excellent adhesion, and can be used in harsh environments such as high temperature and high pressure.

[0081] 2) The thickness of the pre-cured layer applied by the method of the present application is 10 to 30 μm, and the coating thickness is relatively thin, which has the characteristic of saving coating material. On the other hand, it also illustrates the excellent protective performance of the wear-resistant coating of the present application.

[0082] In a fourth aspect, the present application provides a workpiece, the workpiece comprising a workpiece body and a wear-resistant coating fixed to a surface of the workpiece body;

[0083] The thickness of the wear-resistant coating is 8 to 28 μm.

[0084] The workpiece provided in the present application has a wear-resistant coating fixed on its surface, and its beneficial effects are as described in the workpiece processing method provided in the third aspect above, and will not be repeated here. Specific embodiments

[0086] Example 1

[0087] A wear-resistant coating is prepared according to the following method

[0088] S101, adding 1 part of boron nitride, 50 parts of glass powder, 70 parts of n-hexane, and 0.1 part of a dispersing aid (BYK-154) by weight into a grinding device, and ball-milling at a speed of 500 rpm for 5 hours to obtain a filler dispersion with a particle size of ≤160 mesh;

[0089] S102. Add the polysilazane resin to the filler dispersion under stirring at 300 rpm, and stir for 0.5 h to obtain a wear-resistant coating. The mass proportion of the polysilazane resin in the wear-resistant coating is 20%.

[0090] Example 2

[0091] A wear-resistant coating is prepared according to the following method

[0092] S201, adding 10 parts of boron nitride, 5 parts of glass powder, 10 parts of n-hexane, and 2 parts of dispersing aid (BYK-154) by weight into a grinding device, and ball milling at a speed of 400 rpm for 10 hours to obtain a filler dispersion with a particle size of ≤160 mesh;

[0093] S202. Under stirring conditions of 200 rpm, add polysilazane resin to the filler dispersion, and stir for 1 hour to obtain a wear-resistant coating. The mass proportion of the polysilazane resin in the wear-resistant coating is 40%.

[0094] Example 3

[0095] A wear-resistant coating is prepared according to the following method

[0096] S301, adding 5 parts of boron nitride, 20 parts of glass powder, 40 parts of n-hexane, and 1 part of dispersing aid (BYK-154) by weight into a grinding device, and ball milling at a speed of 450 rpm for 8 hours to obtain a filler dispersion with a particle size of ≤160 mesh;

[0097] S302. Under stirring conditions of 250 rpm, add polysilazane resin to the filler dispersion, and stir for 0.75 h to obtain a wear-resistant coating, wherein the mass proportion of the polysilazane resin in the wear-resistant coating is 30%.

[0098] Example 4

[0099] A wear-resistant coating is prepared according to the following method

[0100] S401. Add 3 parts of boron nitride, 1 part of molybdenum disulfide, 6 parts of low-melting-point glass powder, 3 parts of glass fiber powder, 2.5 parts of silicon nitride powder, 59 parts of xylene, and 0.5 parts of a dispersing aid (BYK-154) by weight into a grinding device and ball-mill at a speed of 400 to 500 rpm for 5 to 10 hours to obtain a filler dispersion with a particle size of ≤160 mesh;

[0101] S402. Under stirring conditions of 300 rpm, add polysilazane resin to the filler dispersion, and stir for 1 hour to obtain a wear-resistant coating, wherein the mass proportion of the polysilazane resin in the wear-resistant coating is 25%.

[0102] Example 5

[0103] A wear-resistant coating is prepared according to the following method

[0104] S501, adding 4 parts of graphite powder, 6 parts of low-melting-point glass powder, 3 parts of glass fiber powder, 2.5 parts of silicon nitride powder, 59 parts of xylene, and 0.5 parts of a dispersing aid (BYK-154) by weight into a grinding device and ball-milling at a speed of 400 to 500 rpm for 5 to 10 hours to obtain a filler dispersion with a particle size of ≤160 mesh;

[0105] S502. Add polysilazane resin to the filler dispersion under stirring at 300 rpm, and stir for 1 hour to obtain a wear-resistant coating. The mass proportion of the polysilazane resin in the wear-resistant coating is 25%.

[0106] Comparative Example 1

[0107] A wear-resistant coating is prepared according to the following method

[0108] D101: Same operation as S401.

[0109] D102. The remaining operations are the same as S402, except that the mass proportion of the polysilazane resin in the wear-resistant coating is 45%.

[0110] Comparative Example 2

[0111] A wear-resistant coating is prepared according to the following method

[0112] D201: Same operation as S401.

[0113] D202. The remaining operations are the same as S402, except that the mass proportion of the polysilazane resin in the wear-resistant coating is 15%.

[0114] Example 6

[0115] A workpiece processing method, the operation process of which is as follows:

[0116] S601, the workpiece to be coated is subjected to processes such as sandblasting, solvent cleaning, and drying to obtain a clean workpiece.

[0117] S602, evenly apply the wear-resistant coating prepared in Example 4 to the clean workpiece surface by spraying.

[0118] S603, placing the workpiece coated with the wear-resistant coating in an environment with a temperature of 100°C and drying for 0.5 hours to obtain a pretreated workpiece with a precured layer on the surface, the thickness of the precured layer being 30 μm.

[0119] S604. Place the pretreated workpiece in a muffle furnace for pyrolysis. In an air atmosphere, heat it to 300°C at a rate of 1°C / min and keep it warm for 0.5h; then heat it to 500°C at a rate of 1°C / min and keep it warm for 0.5h; finally heat it to 700°C at a rate of 1°C / min and keep it warm for 0.5h, then cool it to room temperature to obtain a workpiece with a wear-resistant coating on the surface.

[0120] Example 7

[0121] A workpiece processing method, the operation process of which is as follows:

[0122] S701, the workpiece to be coated is subjected to processes such as sandblasting, solvent cleaning, and drying to obtain a clean workpiece.

[0123] S702, evenly apply the wear-resistant coating prepared in Example 4 to the clean workpiece surface by spraying.

[0124] S703, placing the workpiece coated with the wear-resistant coating in an environment with a temperature of 300°C and drying for 0.5 hours to obtain a pretreated workpiece with a precured layer on the surface, the thickness of the precured layer being 10 μm.

[0125] S704. Place the pretreated workpiece in a muffle furnace for pyrolysis. In an air atmosphere, heat it to 300°C at a rate of 10°C / min and keep it warm for 3 hours; then heat it to 600°C at a rate of 10°C / min and keep it warm for 3 hours; finally heat it to 800°C at a rate of 10°C / min and keep it warm for 3 hours, and then cool it to room temperature to obtain a workpiece with a wear-resistant coating on the surface.

[0126] Example 8

[0127] A workpiece processing method, the operation process of which is as follows:

[0128] S801, the workpiece to be coated is subjected to processes such as sandblasting, solvent cleaning, and drying to obtain a clean workpiece.

[0129] S802, evenly apply the wear-resistant coating prepared in Example 4 to the clean workpiece surface by spraying.

[0130] S803, placing the workpiece coated with the wear-resistant coating in an environment with a temperature of 220°C and drying for 1.5 hours to obtain a pretreated workpiece with a precured layer on the surface, the thickness of the precured layer being 10 to 30 μm.

[0131] S804. Place the pretreated workpiece in a muffle furnace for pyrolysis. In an air atmosphere, heat it to 300°C at a rate of 10°C / min and keep it warm for 0.5h; then heat it to 550°C at a rate of 5°C / min and keep it warm for 1h; finally, heat it to 800°C at a rate of 2°C / min and keep it warm for 1.5h, then cool it to room temperature to obtain a workpiece with a wear-resistant coating on the surface.

[0132] Example 9

[0133] A workpiece processing method, the operation process of which is as follows:

[0134] S901, the workpiece to be coated is subjected to processes such as sandblasting, solvent cleaning, and drying to obtain a clean workpiece.

[0135] S902, evenly apply the wear-resistant coating prepared in Example 5 to the clean workpiece surface by spraying.

[0136] S903, placing the workpiece coated with the wear-resistant coating in an environment with a temperature of 220°C and drying for 1.5 hours to obtain a pretreated workpiece with a precured layer on the surface, wherein the thickness of the precured layer is 10 to 30 μm.

[0137] S904. Place the pretreated workpiece in a muffle furnace for pyrolysis. In an air atmosphere, heat it to 300°C at a rate of 10°C / min and keep it warm for 0.5h; then heat it to 550°C at a rate of 5°C / min and keep it warm for 1h; finally, heat it to 800°C at a rate of 2°C / min and keep it warm for 1.5h, and then cool it to room temperature to obtain a workpiece with a wear-resistant coating on the surface.

[0138] Comparative Example 3

[0139] D301: Same operation as S801.

[0140] D302. The remaining operations are the same as S802, except that the surface of the workpiece is coated with the wear-resistant coating prepared by the method of Comparative Example 1.

[0141] D303: Same operation as S803.

[0142] D304: Same operation as S804.

[0143] Comparative Example 4

[0144] D401: Same operation as S801.

[0145] D402. The remaining operations are the same as S802, except that the surface of the workpiece is coated with the wear-resistant coating prepared by the method of Comparative Example 2.

[0146] D403: Same operation as S803.

[0147] D404: Same operation as S804.

[0148] Comparative Example 5

[0149] D501: Same operation as S801.

[0150] D502: Same operation as S802.

[0151] D503: Same operation as S803.

[0152] D504. The remaining operations are the same as those of S804, except that the pyrolysis atmosphere is nitrogen atmosphere.

[0153] Experimental example

[0154] The workpieces obtained in Examples 6 to 9 and Comparative Examples 3 to 5 were subjected to performance tests, and the following tests were performed under the same conditions:

[0155] 1. Coating appearance: Visual observation results are as follows Figure 1 shown.

[0156] 2. Adhesion performance test: Refer to the cross-cut test method of GB / T 9286-1998 for adhesion test. Level 0 has the strongest adhesion, and the larger the value, the worse the adhesion.

[0157] 3. Tribological performance test, the test conditions are: load 1N, dual Φ = 6mm Si3N4 ball, reciprocating mode frequency is 1Hz, test time 30min.

[0158] 4. Wear rate test: Use a surface profiler to measure the wear amount, and then use the wear rate calculation formula to calculate:

[0159]

[0160] Where ΔV is the wear volume change / mm;

[0161] S is the stroke / m;

[0162] P is the load size / N.

[0163] The test results are shown in Table 1

[0164] Table 1

[0165]

[0166]

[0167] As can be seen from Table 1, the present invention proposes that a lubricating and wear-resistant coating with excellent performance can be obtained by compounding polysilazane with active fillers and structural fillers. The data of Example 6 and Comparative Example 5 show the importance of air atmosphere during pyrolysis of the coating. When replaced with inert gas nitrogen, polysilazane pyrolysis cannot produce SiOCN ceramic phase, and better pyrolysis reaction with oxygen occurs, making the coating surface not dense and smooth enough, resulting in defects in the coating and a high wear rate; the data of Example 6 and Comparative Examples 3 and 4 show that when the added content of polysilazane has a certain effect on the density of the coating, the added amount is less than 20wt% and cannot carry the filler, and when the added amount of polysilazane reaches 45wt%, it will cause the coating to crack and the structural filler to fail.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wear-resistant coating, characterized in that: Including polysilazane resin and auxiliary materials; The auxiliary materials include, by weight: 1 to 10 parts of active filler, 5 to 50 parts of structural filler, 10 to 70 parts of solvent, and 0.1 to 2 parts of dispersing aid; The polysilazane resin accounts for 20-40% of the weight of the wear-resistant coating.

2. The wear-resistant coating according to claim 1, characterized in that: The polysilazane includes at least one of an organic polysilazane or a perhydropolysilazane.

3. The wear-resistant coating according to claim 1, characterized in that: The active filler includes a wear-resistant lubricating material; The wear-resistant lubricating material includes at least one of boron nitride, MoS2, graphite powder, graphene, Mxene, and WS2.

4. The wear-resistant coating according to claim 1, characterized in that: The structural filler includes at least one of glass powder, low melting point glass powder, glass fiber powder, silicon oxide, silicon nitride, silicon carbide, mica powder and talc powder.

5. The wear-resistant coating according to claim 1, characterized in that: The solvent includes at least one of n-hexane, n-octane, dichloromethane, ethyl ether, n-butyl ether, toluene, xylene, acetone, methyl ethyl ketone, cyclohexanone, butyl acetate, and ethyl acetate.

6. A method for preparing a wear-resistant coating, used for preparing the wear-resistant coating according to any one of claims 1 to 5, characterized in that: The steps include: a) adding 1 to 10 parts of active filler, 5 to 50 parts of structural filler, 10 to 70 parts of solvent and 0.1 to 2 parts of dispersing aid into a grinding device and ball milling at a speed of 400 to 500 rpm for 5 to 10 hours to obtain a filler dispersion with a particle size of ≤160 mesh; b) adding the polysilazane resin to the filler dispersion under stirring at 200-300 rpm, stirring for 0.5-1 h to obtain a wear-resistant coating, wherein the mass proportion of the polysilazane resin in the wear-resistant coating is 20-40%.

7. A workpiece processing method, characterized in that: The steps include: a) performing surface cleaning treatment on the workpiece to be coated to obtain a clean workpiece; b) uniformly applying the wear-resistant coating according to any one of claims 1 to 5 to the surface of a clean workpiece; c) curing the workpiece coated with the wear-resistant coating to obtain a pre-treated workpiece having a pre-cured layer on the surface, wherein the thickness of the pre-cured layer is 10 to 30 μm; d) placing the pretreated workpiece in a muffle furnace for pyrolysis to obtain a workpiece with a wear-resistant coating on the surface.

8. The workpiece processing method according to claim 7, characterized in that: The curing operation comprises: placing the workpiece coated with the wear-resistant coating in an environment with a temperature of 100 to 300° C. and drying it for 0.5 to 3 hours.

9. The workpiece processing method according to claim 8, characterized in that: The pyrolysis conditions include: in an air atmosphere, heating to 300°C at a rate of 1 to 10°C / min, and keeping the temperature for 0.5 to 3h; Then, heat up to 500-600°C at a rate of 1-10°C / min and keep warm for 0.5-3h; Finally, the temperature is raised to 700-800°C at a rate of 1-10°C / min and kept at this temperature for 0.5-3h.

10. A workpiece processed by the workpiece processing method according to any one of claims 7 to 9, characterized in that: The workpiece includes a workpiece body and a wear-resistant coating fixed to the surface of the workpiece body; The thickness of the wear-resistant coating is 8-28 μm.

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