High-hardness wear-resistant bearing and machining process thereof

Abstract

The invention discloses a high-hardness wear-resistant bearing and a machining process thereof, and relates to the technical field of bearings. The high-hardness wear-resistant bearing comprises a bearing base body, wherein the high-entropy alloy coating and the alloy-doped diamond-like carbon film are sequentially deposited on the surface of the bearing base body; the preparation method comprises the specific preparation steps that after ion etching cleaning is conducted on a bearing base body, deposition is conducted under the argon atmosphere to obtain a high-entropy alloy composite coating, and laser remelting is conducted after deposition is completed; and after the remelted bearing base body is ground and polished, an alloy doped diamond-like carbon film is deposited, and the high-hardness wear-resistant bearing is obtained. Wherein the bearing base body comprises the following chemical components in percentage by mass: 0.90 to 1.02 percent of C, 1.50 to 1.59 percent of Cr, 0.24 to 0.28 percent of Si, 0.30 to 0.38 percent of Mn, 0.04 to 0.08 percent of Ni, 0.05 to 0.10 percent of Nb, 0.05 to 0.15 percent of V and the balance of Fe and inevitable impurities.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, in particular to a high-hardness wear-resistant bearing and a processing technology thereof. Background Art

[0002] As core components of mechanical systems, bearings play an irreplaceable role in the industrial sector. They not only support rotating parts but also serve as a key medium for energy transmission and motion control. From wind power transmission systems to high-speed rail wheels, from aircraft engine turbines to precision machine tool turntables, the reliability and performance of bearings directly impact the operating efficiency, lifespan, and safety of equipment.

[0003] Bearing steel (such as GCr15) has long been the main material for bearing manufacturing. Through quenching and low-temperature tempering processes, this type of steel can achieve a hardness of HRC60 to 64, while retaining a certain toughness to withstand impact loads. However, the limitations of traditional bearing steel are gradually becoming apparent: high hardness often comes with the risk of brittleness, and under extreme operating conditions (such as high temperatures or corrosive environments), the steel surface is prone to oxidation or wear. For example, in humid marine environments, ordinary bearings may form pits on the raceways due to rust, resulting in increased vibration and noise, or even seizure. Moreover, with the increasingly stringent requirements of modern industry for mechanical systems, bearings, as devices that reduce friction, support loads, position and guide, and extend equipment life, are subject to the complex mechanical environments of high-speed rotation or heavy load conditions. If the bearing hardness is insufficient, the surface is prone to indentations due to plastic deformation, causing the rolling element motion trajectory to deviate, causing vibration or even failure. If the wear resistance is poor, friction loss will accelerate material fatigue and shorten the equipment maintenance cycle. Therefore, improving the hardness and surface wear resistance of bearing materials, such as surface engineering treatment and improving hardness and wear resistance through alloy coating, may become a key path to solving these challenges. Summary of the Invention

[0004] The object of the present invention is to provide a high-hardness wear-resistant bearing and a processing technology thereof, so as to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-hardness, wear-resistant bearing comprises a bearing base; a high-entropy alloy coating and an alloy-doped diamond-like carbon film are sequentially deposited on the surface of the bearing base; the chemical composition of the bearing base comprises, by mass percentage, 0.90-1.02% C, 1.50-1.59% Cr, 0.24-0.28% Si, 0.30-0.38% Mn, 0.04-0.08% Ni, 0.05-0.10% Nb, 0.05-0.15% V, with the remainder being Fe and unavoidable impurities.

[0007] A method for processing a high-hardness wear-resistant bearing comprises the following processing steps:

[0008] Step 1: Take the bearing substrate and perform ion etching and cleaning, then dry it after cleaning, and deposit a high entropy alloy composite coating under an argon atmosphere. After the deposition is completed, perform laser remelting;

[0009] Step 2: grinding and polishing the remelted bearing substrate, and then depositing an alloy-doped diamond-like carbon film to obtain the high-hardness wear-resistant bearing;

[0010] Furthermore, the high entropy alloy composite coating is obtained by supersonic flame spraying of high entropy alloy composite powder; the high entropy alloy composite powder is obtained by mixing and grinding reinforcement phase particles, rare earth oxides and high entropy alloy powder, and has a particle size of 30-40 μm;

[0011] Furthermore, the reinforcement phase particles are one or more combinations of niobium carbide, tungsten carbide, and titanium carbide;

[0012] Furthermore, the rare earth oxide is one or a combination of two of cerium oxide, lanthanum oxide and yttrium oxide;

[0013] Furthermore, the chemical composition of the high entropy alloy powder includes, by mass percentage, 8.6-10.8% Al, 18.9-23.4% Co, 16.7-20.7% Cr, 17.9-22.1% Fe and 23.3-37.8% Ni;

[0014] Furthermore, the mass ratio of the reinforcement phase particles, the rare earth oxide and the high entropy alloy powder is (5-15): (0.2-0.5): (85-95);

[0015] Furthermore, the gas flow rates used in HVOF spraying include: 10-20 L / min nitrogen, 200-300 L / min oxygen, 550-650 L / min hydrogen; the spraying distance is 150-220 mm; the powder feeding rate is 40-50 g / min;

[0016] Furthermore, the process parameters of the laser remelting in step 1 include: laser power of 150-250 W, spot diameter of 0.5 mm, scanning rate of 2-4 mm / min, and overlap rate of 50-60%;

[0017] Furthermore, the process parameters of the ion etching in step 1 include: ion beam voltage of 1000-1500 V, working gas of argon, working gas pressure of 0.1-10 Pa, ion energy of 100-1000 eV, and etching time of 30-40 min;

[0018] Furthermore, alloy-doped diamond-like carbon films were obtained by magnetron sputtering using a CoCrFeNi alloy target and a graphite target. The process parameters of the magnetron sputtering included: a sputtering power of 100-120 W, an argon working gas, a working pressure of 0.1-10 Pa, a bias voltage of 600 V, a current of 1-2 A for the CoCrFeNi alloy target, and a current of 0.5-1.2 A for the graphite target.

[0019] Furthermore, the thickness of the high entropy alloy composite coating is 200-300 μm; the thickness of the alloy-doped diamond-like carbon film is 1-2 μm.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The bearing substrate prepared by the present invention optimizes the chemical composition and introduces Nb and V elements into the common GCr15 steel to refine the grain and optimize the structure, thereby improving the mechanical properties of the substrate itself; the bearing substrate is ion-etched and cleaned to improve the interface bonding strength between the subsequent high-entropy alloy composite coating and the substrate; after the ion etching is completed, a high-entropy alloy coating is deposited on the substrate surface using the supersonic flame spraying (HVOF) technology, wherein the high-entropy alloy coating is obtained by grinding a high-entropy alloy powder, a carbide reinforcement and a rare earth oxide, wherein the high-entropy alloy powder is selected from AlCoCrFeNi components, and the addition of carbides brings about solid solution strengthening and second-phase strengthening effects, thereby improving the hardness and high-temperature stability of the coating alloy; the addition of rare earth oxides promotes the formation of BCC phases in the high-entropy alloy; the addition of carbides and rare earth oxides improves the application effect of the high-entropy alloy composite coating to a certain extent; after the deposition of the high-entropy alloy composite coating, laser remelting is performed to eliminate pores and refine the grains;

[0022] 2. The present invention performs magnetron sputtering on a diamond-like carbon film after laser remelting to further improve the friction reduction effect. The film is doped with CoCrFeNi alloy to improve the interface bonding with the high-entropy alloy composite coating, while also improving the hardness. By the joint action of the high-entropy alloy composite coating and the diamond-like film on the surface of the bearing substrate, a synergistic improvement in hardness and wear resistance and friction reduction can be achieved, thereby improving the application effect of the bearing. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0024] The chemical composition of the bearing matrix in the experiment includes: 0.97% C, 1.54% Cr, 0.25% Si, 0.33% Mn, 0.08% Ni, 0.08% Nb, 0.12% V, and the balance is Fe and unavoidable impurities;

[0025] Example 1: This example provides a processing technology for high-hardness wear-resistant bearings, and the specific steps are as follows:

[0026] Step 1: Take the bearing substrate and perform ion etching cleaning. Set the ion beam voltage to 1200V, the working gas to argon, the working pressure to 10Pa, the ion energy to 600eV, and the etching and cleaning for 40 minutes, followed by drying. Use supersonic flame spraying to coat the surface of the bearing body after etching and cleaning. Deposit a high-entropy alloy composite coating with a thickness of 300μm in an argon atmosphere. After deposition, perform laser remelting.

[0027] Step 2: After grinding and polishing the remelted bearing substrate, the substrate is transferred to a magnetron sputtering device, and a CoCrFeNi alloy target and a graphite target are used to deposit an alloy-doped diamond-like carbon film with a thickness of 1 μm on the remelted surface by magnetron sputtering to obtain the high-hardness wear-resistant bearing;

[0028] The high-entropy alloy composite powder was obtained by mixing and grinding tungsten carbide, cerium oxide, and high-entropy alloy powder in a mass ratio of 10:0.3:90, with a particle size of 30 μm. The chemical composition of the high-entropy alloy powder includes: 10.69% Al, 23.34% Co, 20.61% Cr, 22.02% Fe, and 23.34% Ni.

[0029] The gas flow rates used for HVOF spraying include: 15L / min nitrogen, 200L / min oxygen, and 650L / min hydrogen; the spraying distance is 200mm; and the powder feed rate is 40g / min.

[0030] The process parameters of laser remelting include: laser power of 200 W, spot diameter of 0.5 mm, scanning rate of 2 mm / min, and overlap rate of 50%;

[0031] The process parameters of magnetron sputtering include: sputtering power of 120 W, working gas of argon, working pressure of 8 Pa, set bias voltage of 600 V, CoCrFeNi alloy target current of 1.5 A; graphite target current of 1 A.

[0032] Example 2: Referring to Example 1, the component ratio of the high entropy alloy composite powder was adjusted to: tungsten carbide: cerium oxide: high entropy alloy = 15:0.5:85. The specific steps are as follows:

[0033] Step 1: Take the bearing substrate and perform ion etching cleaning. Set the ion beam voltage to 1200V, the working gas to argon, the working pressure to 10Pa, the ion energy to 600eV, and the etching and cleaning for 40 minutes, followed by drying. Use supersonic flame spraying to coat the surface of the bearing body after etching and cleaning. Deposit a high-entropy alloy composite coating with a thickness of 300μm in an argon atmosphere. After deposition, perform laser remelting.

[0034] Step 2: After grinding and polishing the remelted bearing substrate, the substrate is transferred to a magnetron sputtering device, and a CoCrFeNi alloy target and a graphite target are used to deposit an alloy-doped diamond-like carbon film with a thickness of 1 μm on the remelted surface by magnetron sputtering to obtain the high-hardness wear-resistant bearing;

[0035] The high-entropy alloy composite powder was obtained by mixing and grinding tungsten carbide, cerium oxide, and high-entropy alloy powder in a mass ratio of 15:0.5:85, with a particle size of 30 μm. The chemical composition of the high-entropy alloy powder includes: 10.69% Al, 23.34% Co, 20.61% Cr, 22.02% Fe, and 23.34% Ni.

[0036] The gas flow rates used for HVOF spraying include: 15L / min nitrogen, 200L / min oxygen, and 650L / min hydrogen; the spraying distance is 200mm; and the powder feed rate is 40g / min.

[0037] The process parameters of laser remelting include: laser power of 200 W, spot diameter of 0.5 mm, scanning rate of 2 mm / min, and overlap rate of 50%;

[0038] The process parameters of magnetron sputtering include: sputtering power of 120 W, working gas of argon, working pressure of 8 Pa, set bias voltage of 600 V, CoCrFeNi alloy target current of 1.5 A; graphite target current of 1 A.

[0039] Example 3: Referring to Example 1, the component ratio of the high entropy alloy composite powder was adjusted to: tungsten carbide: cerium oxide: high entropy alloy = 5:0.5:95. The specific steps are as follows:

[0040] Step 1: Take the bearing substrate and perform ion etching cleaning. Set the ion beam voltage to 1200V, the working gas to argon, the working pressure to 10Pa, the ion energy to 600eV, and the etching and cleaning for 40 minutes, followed by drying. Use supersonic flame spraying to coat the surface of the bearing body after etching and cleaning. Deposit a high-entropy alloy composite coating with a thickness of 300μm in an argon atmosphere. After deposition, perform laser remelting.

[0041] Step 2: After grinding and polishing the remelted bearing substrate, the substrate is transferred to a magnetron sputtering device, and a CoCrFeNi alloy target and a graphite target are used to deposit an alloy-doped diamond-like carbon film with a thickness of 1 μm on the remelted surface by magnetron sputtering to obtain the high-hardness wear-resistant bearing;

[0042] The high-entropy alloy composite powder was obtained by mixing and grinding tungsten carbide, cerium oxide, and high-entropy alloy powder in a mass ratio of 5:0.5:95, with a particle size of 30 μm. The chemical composition of the high-entropy alloy powder includes: 10.69% Al, 23.34% Co, 20.61% Cr, 22.02% Fe, and 23.34% Ni.

[0043] The gas flow rates used for HVOF spraying include: 15L / min nitrogen, 200L / min oxygen, and 650L / min hydrogen; the spraying distance is 200mm; and the powder feed rate is 40g / min.

[0044] The process parameters of laser remelting include: laser power of 200 W, spot diameter of 0.5 mm, scanning rate of 2 mm / min, and overlap rate of 50%;

[0045] The process parameters of magnetron sputtering include: sputtering power of 120 W, working gas of argon, working pressure of 8 Pa, set bias voltage of 600 V, CoCrFeNi alloy target current of 1.5 A; graphite target current of 1 A.

[0046] Example 4: Referring to Example 1, the chemical composition of the high entropy alloy is adjusted. The specific steps are as follows:

[0047] Step 1: Take the bearing substrate and perform ion etching cleaning. Set the ion beam voltage to 1200V, the working gas to argon, the working pressure to 10Pa, the ion energy to 600eV, and the etching and cleaning for 40 minutes, followed by drying. Use supersonic flame spraying to coat the surface of the bearing body after etching and cleaning. Deposit a high-entropy alloy composite coating with a thickness of 300μm in an argon atmosphere. After deposition, perform laser remelting.

[0048] Step 2: After grinding and polishing the remelted bearing substrate, the substrate is transferred to a magnetron sputtering device, and a CoCrFeNi alloy target and a graphite target are used to deposit an alloy-doped diamond-like carbon film with a thickness of 1 μm on the remelted surface by magnetron sputtering to obtain the high-hardness wear-resistant bearing;

[0049] The high-entropy alloy composite powder was obtained by mixing and grinding tungsten carbide, cerium oxide, and high-entropy alloy powder in a mass ratio of 10:0.3:90, with a particle size of 30 μm. The chemical composition of the high-entropy alloy powder includes: 8.71% Al, 18.95% Co, 16.72% Cr, 17.95% Fe, and 37.67% Ni.

[0050] The gas flow rates used for HVOF spraying include: 15L / min nitrogen, 200L / min oxygen, and 650L / min hydrogen; the spraying distance is 200mm; and the powder feed rate is 40g / min.

[0051] The process parameters of laser remelting include: laser power of 200 W, spot diameter of 0.5 mm, scanning rate of 2 mm / min, and overlap rate of 50%;

[0052] The process parameters of magnetron sputtering include: sputtering power of 120 W, working gas of argon, working pressure of 8 Pa, set bias voltage of 600 V, CoCrFeNi alloy target current of 1.5 A; graphite target current of 1 A.

[0053] Example 5, referring to Example 1, adjust the alloy target current, the specific steps are as follows:

[0054] Step 1: Take the bearing substrate and perform ion etching cleaning. Set the ion beam voltage to 1200V, the working gas to argon, the working pressure to 10Pa, the ion energy to 600eV, and the etching and cleaning for 40 minutes, followed by drying. Use supersonic flame spraying to coat the surface of the bearing body after etching and cleaning. Deposit a high-entropy alloy composite coating with a thickness of 300μm in an argon atmosphere. After deposition, perform laser remelting.

[0055] Step 2: After grinding and polishing the remelted bearing substrate, the substrate is transferred to a magnetron sputtering device, and a CoCrFeNi alloy target and a graphite target are used to deposit an alloy-doped diamond-like carbon film with a thickness of 1 μm on the remelted surface by magnetron sputtering to obtain the high-hardness wear-resistant bearing;

[0056] The high-entropy alloy composite powder was obtained by mixing and grinding tungsten carbide, cerium oxide, and high-entropy alloy powder in a mass ratio of 10:0.3:90, with a particle size of 30 μm. The chemical composition of the high-entropy alloy powder includes: 10.69% Al, 23.34% Co, 20.61% Cr, 22.02% Fe, and 23.34% Ni.

[0057] The gas flow rates used for HVOF spraying include: 15L / min nitrogen, 200L / min oxygen, and 650L / min hydrogen; the spraying distance is 200mm; and the powder feed rate is 40g / min.

[0058] The process parameters of laser remelting include: laser power of 200 W, spot diameter of 0.5 mm, scanning rate of 2 mm / min, and overlap rate of 50%;

[0059] The process parameters of magnetron sputtering include: sputtering power of 120 W, working gas of argon, working pressure of 8 Pa, set bias voltage of 600 V, CoCrFeNi alloy target current of 1 A; graphite target current of 1 A.

[0060] Comparative Example 1: As a control experiment of Example 1, the prepared diamond-like carbon film was not alloy-doped, and the specific steps were as follows;

[0061] Step 1: Take the bearing substrate and perform ion etching cleaning. Set the ion beam voltage to 1200V, the working gas to argon, the working pressure to 10Pa, the ion energy to 600eV, and the etching and cleaning for 40 minutes, followed by drying. Use supersonic flame spraying to coat the surface of the bearing body after etching and cleaning. Deposit a high-entropy alloy composite coating with a thickness of 300μm in an argon atmosphere. After deposition, perform laser remelting.

[0062] Step 2: After grinding and polishing the remelted bearing substrate, the substrate is transferred to a magnetron sputtering device, and a diamond-like carbon film with a thickness of 1 μm is deposited on the remelted surface by magnetron sputtering using a graphite target to obtain the high-hardness wear-resistant bearing;

[0063] The high-entropy alloy composite powder was obtained by mixing and grinding tungsten carbide, cerium oxide, and high-entropy alloy powder in a mass ratio of 10:0.3:90, with a particle size of 30 μm. The chemical composition of the high-entropy alloy powder includes: 10.69% Al, 23.34% Co, 20.61% Cr, 22.02% Fe, and 23.34% Ni.

[0064] The gas flow rates used for HVOF spraying include: 15L / min nitrogen, 200L / min oxygen, and 650L / min hydrogen; the spraying distance is 200mm; and the powder feed rate is 40g / min.

[0065] The process parameters of laser remelting include: laser power of 200 W, spot diameter of 0.5 mm, scanning rate of 2 mm / min, and overlap rate of 50%;

[0066] The process parameters of magnetron sputtering include: sputtering power of 120 W, working gas of argon, working gas pressure of 8 Pa, set bias voltage of 600 V, and graphite target current of 1 A.

[0067] Comparative Example 2: As a control experiment of Example 1, the thickness of the high entropy alloy composite coating was reduced. The specific steps are as follows:

[0068] Step 1: Take the bearing substrate and perform ion etching cleaning. Set the ion beam voltage to 1200V, the working gas to argon, the working pressure to 10Pa, the ion energy to 600eV, and the etching and cleaning for 40 minutes, followed by drying. Use supersonic flame spraying to coat the surface of the bearing body after etching and cleaning. Deposit a high-entropy alloy composite coating with a thickness of 100μm in an argon atmosphere. After deposition, perform laser remelting.

[0069] Step 2: After grinding and polishing the remelted bearing substrate, the substrate is transferred to a magnetron sputtering device, and a CoCrFeNi alloy target and a graphite target are used to deposit an alloy-doped diamond-like carbon film with a thickness of 1 μm on the remelted surface by magnetron sputtering to obtain the high-hardness wear-resistant bearing;

[0070] The high-entropy alloy composite powder was obtained by mixing and grinding tungsten carbide, cerium oxide, and high-entropy alloy powder in a mass ratio of 10:0.3:90, with a particle size of 30 μm. The chemical composition of the high-entropy alloy powder includes: 10.69% Al, 23.34% Co, 20.61% Cr, 22.02% Fe, and 23.34% Ni.

[0071] The gas flow rates used for HVOF spraying include: 15L / min nitrogen, 200L / min oxygen, and 650L / min hydrogen; the spraying distance is 200mm; and the powder feed rate is 40g / min.

[0072] The process parameters of laser remelting include: laser power of 200 W, spot diameter of 0.5 mm, scanning rate of 2 mm / min, and overlap rate of 50%;

[0073] The process parameters of magnetron sputtering include: sputtering power of 120 W, working gas of argon, working pressure of 8 Pa, set bias voltage of 600 V, CoCrFeNi alloy target current of 1.5 A; graphite target current of 1 A.

[0074] Comparative Example 3: As a control experiment of Example 1, no tungsten carbide is added to the high entropy alloy composite coating. The specific steps are as follows:

[0075] Step 1: Take the bearing substrate and perform ion etching cleaning. Set the ion beam voltage to 1200V, the working gas to argon, the working pressure to 10Pa, the ion energy to 600eV, and the etching and cleaning for 40 minutes, followed by drying. Use supersonic flame spraying to coat the surface of the bearing body after etching and cleaning. Deposit a high-entropy alloy composite coating with a thickness of 300μm in an argon atmosphere. After deposition, perform laser remelting.

[0076] Step 2: After grinding and polishing the remelted bearing substrate, the substrate is transferred to a magnetron sputtering device, and a CoCrFeNi alloy target and a graphite target are used to deposit an alloy-doped diamond-like carbon film with a thickness of 1 μm on the remelted surface by magnetron sputtering to obtain the high-hardness wear-resistant bearing;

[0077] The high-entropy alloy composite powder was obtained by mixing and grinding cerium oxide and high-entropy alloy powder in a mass ratio of 0.3:90, with a particle size of 30 μm. The chemical composition of the high-entropy alloy powder includes: 10.69% Al, 23.34% Co, 20.61% Cr, 22.02% Fe and 23.34% Ni.

[0078] The gas flow rates used for HVOF spraying include: 15L / min nitrogen, 200L / min oxygen, and 650L / min hydrogen; the spraying distance is 200mm; and the powder feed rate is 40g / min.

[0079] The process parameters of laser remelting include: laser power of 200 W, spot diameter of 0.5 mm, scanning rate of 2 mm / min, and overlap rate of 50%;

[0080] The process parameters of magnetron sputtering include: sputtering power of 120 W, working gas of argon, working pressure of 8 Pa, set bias voltage of 600 V, CoCrFeNi alloy target current of 1.5 A; graphite target current of 1 A.

[0081] Detection test

[0082] 1. Hardness test: using CPX-NHT 2 The hardness of the coatings of the bearings prepared in Examples 1-5 and Comparative Examples 1-3 was tested using a nanoindentation tester. Under a load of 10 mN, the loading and unloading were both 30 seconds, and the load was maintained for 10 seconds. The data are recorded in Table 1.

[0083] 2. Wear resistance test: Square specimens of 10 mm × 8 mm × 1.5 mm were cut from the bearings prepared in Examples 1-5 and Comparative Examples 1-3. After polishing, the specimens were placed in an HT-1000G friction and wear tester for friction and wear testing. GCr15 bearing steel was used as the friction pair, the load was 50 N, and the wear was carried out for 30 min. The average wear coefficient was calculated and shown in Table 1.

[0084] Table 1

[0085]

[0086] Conclusion: Example 1 has better experimental results than the other examples 2-5. Under the parameter setting of Example 1, the hardness and wear resistance are excellent; Example 2 adjusts the component ratio of the high entropy alloy mixed powder and increases the carbide content; Example 3 reduces the carbide content, which has a greater impact on the wear rate; Example 4 adjusts the chemical composition ratio of the high entropy alloy, which has a greater impact on the composite coating; Comparative Example 5 adjusts the alloy target current and reduces the alloy doping amount in the diamond-like film, which has a greater impact on the hardness and wear resistance of the bearing; Comparative Example 1 does not dope the diamond-like film with alloy. It has a great influence on the hardness of the film layer, but has little effect on the wear resistance. The doping of the alloy reduces the wear resistance of the diamond-like carbon film, but at the same time reduces the synergistic effect between the composite coatings. Due to the deep wear scars, the intermediate coating mainly plays a wear-resistant role in the later stage, so the wear rate increases significantly; Comparative Example 2 reduces the thickness of the intermediate layer-high entropy alloy composite coating, which has a certain influence on the hardness and wear rate; Comparative Example 3 does not add carbide reinforcing particles to the high entropy alloy composite coating. Due to the deep wear scars, the intermediate layer high entropy alloy composite coating plays a main wear-resistant role in the later stage, so the wear rate increases.

[0087] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A high-hardness wear-resistant bearing, characterized in that: The high-hardness wear-resistant bearing includes a bearing base; a high-entropy alloy coating and an alloy-doped diamond-like carbon film are sequentially deposited on the surface of the bearing base; the chemical composition of the bearing base includes, by mass percentage, 0.90-1.02% C, 1.50-1.59% Cr, 0.24-0.28% Si, 0.30-0.38% Mn, 0.04-0.08% Ni, 0.05-0.10% Nb, 0.05-0.15% V, and the remainder is Fe and unavoidable impurities.

2. A method for processing a high-hardness wear-resistant bearing, characterized in that: The processing steps include: Step 1: Take the bearing substrate and perform ion etching and cleaning, then dry it after cleaning, and deposit a high entropy alloy composite coating under an argon atmosphere. After the deposition is completed, perform laser remelting; Step 2: After grinding and polishing the remelted bearing substrate, an alloy-doped diamond-like carbon film is deposited to obtain the high-hardness wear-resistant bearing.

3. The method for processing a high-hardness wear-resistant bearing according to claim 2, characterized in that: The high entropy alloy composite coating is obtained by supersonic flame spraying high entropy alloy composite powder; the high entropy alloy composite powder is obtained by mixing and grinding reinforcement phase particles, rare earth oxide and high entropy alloy powder, and has a particle size of 30-40 μm.

4. The method for processing a high-hardness wear-resistant bearing according to claim 3, characterized in that: The reinforcing phase particles are one or more combinations of niobium carbide, tungsten carbide, and titanium carbide; the rare earth oxide is one or two combinations of cerium oxide, lanthanum oxide, and yttrium oxide; and the chemical composition of the high-entropy alloy powder includes, by mass percentage, 8.6-10.8% Al, 18.9-23.4% Co, 16.7-20.7% Cr, 17.9-22.1% Fe, and 23.3-37.8% Ni.

5. The method for processing a high-hardness wear-resistant bearing according to claim 2, characterized in that: The mass ratio of reinforcement phase particles, rare earth oxide and high entropy alloy powder is (5-15): (0.2-0.5): (85-95); The gas flow rates used in HVOF spraying include: 10-20L / min nitrogen, 200-300L / min oxygen, and 550-650L / min hydrogen. The spraying distance is 150-220mm; the powder feeding rate is 40-50g / min.

6. The method for processing a high-hardness wear-resistant bearing according to claim 2, characterized in that: The process parameters of the laser remelting in step 1 include: laser power of 150-250 W, spot diameter of 0.5 mm, scanning rate of 2-4 mm / min, and overlap rate of 50-60%.

7. The method for processing a high-hardness wear-resistant bearing according to claim 2, characterized in that: The process parameters of the ion etching in step 1 include: ion beam voltage of 1000-1500 V, working gas of argon, working gas pressure of 0.1-10 Pa, ion energy of 100-1000 eV, and etching time of 30-40 min.

8. The method for processing a high-hardness wear-resistant bearing according to claim 2, characterized in that: The alloy-doped diamond-like carbon film is obtained by magnetron sputtering using a CoCrFeNi alloy target and a graphite target; the process parameters of the magnetron sputtering include: sputtering power of 100-120W, working gas of argon, working gas pressure of 0.1-10Pa, set bias voltage of 600V, CoCrFeNi alloy target current of 1-2A; graphite target current of 0.5-1.2A.

9. The method for processing a high-hardness wear-resistant bearing according to claim 2, characterized in that: The thickness of the high entropy alloy composite coating is 200-300 μm; the thickness of the alloy-doped diamond-like carbon film is 1-2 μm.

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