Preparation method of high-hardness wear-resistant coating

Abstract

The invention discloses a preparation method of a high-hardness wear-resistant coating, the high-hardness wear-resistant coating comprises FeCoCrNiMn high-entropy alloy powder and TiC powder, the TiC powder accounts for 0%-20% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder, and the mechanical property and wear resistance of the coating material are effectively improved. The high-entropy alloy coating material is used for preparing a coating, and the method is specifically implemented according to the following steps that firstly, the surface of a base material is pretreated; 2, the FeCoCrNiMn high-entropy alloy powder and the TiC powder are subjected to ball milling, mixing and machining; and 3, laser power parameters and the scanning speed are set, the coating is prepared through laser cladding equipment, and the method is used for preparing the high-entropy alloy coating.

Description

Technical Field

[0001] This invention belongs to the field of surface engineering technology, and relates to high-entropy alloy coating materials and methods for preparing high-entropy alloy coatings. Background Technology

[0002] High-entropy alloys (HEAs), as a novel type of multi-principal element alloy material, exhibit high strength, high hardness, excellent wear resistance, and corrosion resistance that are difficult for traditional alloys to achieve due to their high-entropy effect, lattice distortion effect, hysteresis diffusion effect, and "cocktail" effect. The FeCoCrNiMn (also known as Cantor alloy) system is one of the most typical representatives. Its face-centered cubic (FCC) structure endows it with good toughness and machinability, but the intrinsic hardness of the pure FCC phase is relatively low, which to some extent limits its application in extreme wear-resistant fields.

[0003] How to further enhance high-entropy alloys and improve the mechanical properties and wear resistance of coating materials is now a mainstream research topic. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing a high-hardness wear-resistant coating, which effectively improves the mechanical properties and wear resistance of the coating material.

[0005] Another objective of this invention is to provide a method for preparing a high-hardness, wear-resistant coating for use in preparing a high-entropy alloy coating.

[0006] The first technical solution adopted in this invention is a method for preparing a high-hardness wear-resistant coating, comprising FeCoCrNiMn high-entropy alloy powder and TiC powder, wherein the TiC powder is 0%-20% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

[0007] The invention is further characterized by:

[0008] The mass fractions of each element in the FeCoCrNiMn high-entropy alloy powder are as follows: Fe 20-40 parts, Co 3-6 parts, Cr 18-36 parts, Ni 30-60 parts, Mn 26-52 parts.

[0009] The second technical solution adopted in this invention is a method for preparing a high-hardness wear-resistant coating, which uses the high-entropy alloy coating material of this invention to prepare the coating, specifically implemented according to the following steps:

[0010] Step 1: The surface of the substrate material is polished with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. Solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 100-150:2-6 and evenly applied to the surface of the metal substrate. The substrate material is preheated to 180-250℃ and kept at that temperature for 30-60 minutes.

[0011] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0012] Step 3: Set the laser power parameters and scanning speed, and prepare the coating using laser cladding equipment.

[0013] The invention is further characterized by:

[0014] The laser power parameters are 1800W to 2200W, and the scanning speeds are 6mm / s to 10mm / s.

[0015] The laser power parameters are 1800W, and the scanning speed is 6mm / s to 8mm / s.

[0016] The powder is fed synchronously using a coaxial powder feeder that contains FeCoCrNiMn high-entropy alloy powder and TiC powder respectively.

[0017] In step 2, during the laser cladding process, argon is used as a protective gas.

[0018] The solid lubricant is 0.5%-2% of the mass fraction of FeCoCrNiMn high-entropy alloy powder.

[0019] The preparation method of the above-mentioned solid lubricant is as follows:

[0020] S1: By weight, mix 5-8 parts of 1,1,3,3-tetramethyldisiloxane with 500-1000 parts of toluene to obtain a mixed solution. Then add 100-120 parts of molybdenum disulfide powder to the mixed solution, ultrasonically disperse until uniform, heat to reflux toluene, stir and keep warm for 6-10 hours.

[0021] S2: Add 0.05-0.5 parts of tetrabromobisphenol A dielyl ether, 3-6 parts of lanthanum acrylate, 0.03-0.6 parts of 3-(2-carboxyvinyl)phenylboronic acid, and 0.03-0.4 parts of chloroplatinic acid in isopropanol solution; stir at 57-68℃ for 100-150 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0022] The concentration of chloroplatinic acid in the isopropanol solution of the above-mentioned chloroplatinic acid is 0.05-0.5 mol / L.

[0023] The beneficial effects of this invention are:

[0024] This invention discloses a method for preparing a high-hardness, wear-resistant coating. By introducing TiC particles into a high-entropy alloy matrix, the coating material can possess beneficial effects such as high strength, high wear resistance, and corrosion resistance, as detailed below:

[0025] 1) Strength Enhancement: TiC particles possess high hardness and excellent strength, which can effectively enhance the strength and rigidity of high-entropy alloys. TiC particles dispersed in the high-entropy alloy matrix can prevent crack propagation and increase the tensile and compressive strength of the material.

[0026] 2) Improved Wear Resistance: Due to the high hardness and wear resistance of TiC particles, tetrabromobisphenol A can inhibit the oxidation and corrosion of high-entropy alloys. Lanthanum-modified molybdenum disulfide, as a solid lubricant, can reduce the surface friction coefficient of the alloy, lower the wear rate, and enhance the wear resistance of the alloy. Introducing the TiC reinforcing phase can significantly improve the wear resistance of high-entropy alloys. Equipment wear is a common problem. However, materials coated with high-entropy alloys can effectively resist wear and impact. The hard, wear-resistant protective layer they form can extend the service life of equipment, reduce the frequency of maintenance and replacement, and thus reduce maintenance costs.

[0027] 3) Corrosion Resistance: TiC particles possess excellent corrosion resistance and oxidation resistance. Introducing TiC as a reinforcing phase can improve the corrosion resistance of high-entropy alloys. For example, in practical applications, various equipment operating environments may contain humidity, acidic substances, or other corrosive components, which can cause corrosion. However, equipment coated with high-entropy alloy materials exhibits excellent chemical stability and corrosion resistance, effectively resisting various forms of corrosion, extending equipment service life, and reducing maintenance costs.

[0028] 4) Enhanced interface effect: The interface formed between TiC particles and the high-entropy alloy matrix can play a reinforcing role. Lanthanum-modified molybdenum disulfide can also improve the hardness and tensile strength of the alloy by changing the lattice constant and dislocation motion. The combination of the two can prevent crack propagation and improve the toughness of the material. This interface reinforcement effect can effectively improve the fracture toughness of high-entropy alloys, reduce their brittleness, and improve the reliability and durability of the material.

[0029] This invention discloses a method for preparing a high-hardness, wear-resistant coating. By using a high-entropy alloy coating, the severe wear and corrosion problems encountered by equipment during long-term use are solved, significantly extending the equipment's service life and effectively controlling wear and corrosion. Furthermore, equipment using the high-entropy alloy coating also reduces energy consumption; the smooth surface of the coating reduces frictional resistance between the equipment and the environment, further lowering energy consumption and operating costs. Attached Figure Description

[0030] Figure 1 This is a flowchart of a method for preparing a high-hardness wear-resistant coating;

[0031] Figure 2 These are photos of the high-hardness, wear-resistant coating on site.

[0032] Figure 3 These are the XRD patterns of FeCoCrNiMn coatings with different TiC contents;

[0033] Figure 4 These are microstructure diagrams of cladding layers with different TiC addition amounts;

[0034] Figure 5 This is a TiC 5% scanning energy dispersive spectroscopy (EDS) analysis chromatogram.

[0035] Figure 6 This is a hardness distribution diagram of the cladding layer;

[0036] Figure 7 Here is a graph showing the friction coefficients of each sample;

[0037] Figure 8 This is a three-dimensional morphological image of the cladding layer sample. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] This embodiment provides a method for preparing a high-hardness wear-resistant coating, comprising FeCoCrNiMn high-entropy alloy powder and TiC powder. The mass fractions of each element in the FeCoCrNiMn high-entropy alloy powder are as follows: Fe 20.31%, Co 3.78%, Cr 18.76%, Ni 30.83%, Mn 26.31%, and the sum of the mass fractions of the above elements is 100%.

[0041] Introducing TiC (titanium carbide) reinforcing phase into high-entropy alloys can further improve their mechanical properties and wear resistance.

[0042] Example 2

[0043] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0044] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 100:2 and evenly applied to the surface of the substrate material. The substrate material is preheated to 180°C and kept at that temperature for 60 minutes.

[0045] The solid lubricant is 0.5% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0046] S1: Mix 5 kg of 1,1,3,3-tetramethyldisiloxane with 500 kg of toluene to obtain a mixed solution. Then add 100 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 6 hours.

[0047] S2: Add 0.1 kg of tetrabromobisphenol A dielyl ether, 3 kg of lanthanum acrylate, 0.1 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.05 kg of isopropanol solution of 0.1 mol / L chloroplatinic acid; stir at 57 °C for 100 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0048] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0049] The TiC powder is 1% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

[0050] Step 3: Set the laser power parameters to 1800W and the scanning speed to 6mm / s. Use a coaxial powder feeder containing FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0051] Example 3

[0052] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0053] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 100:2 and evenly applied to the surface of the substrate material. The substrate material is preheated to 180°C and kept at that temperature for 60 minutes.

[0054] The solid lubricant is 1.2% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0055] S1: Mix 5 kg of 1,1,3,3-tetramethyldisiloxane with 500 kg of toluene to obtain a mixed solution. Then add 100 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 6 hours.

[0056] S2: Add 0.1 kg of tetrabromobisphenol A dielyl ether, 3 kg of lanthanum acrylate, 0.1 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.05 kg of isopropanol solution of 0.1 mol / L chloroplatinic acid; stir at 57 °C for 100 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0057] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0058] The TiC powder is 3% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

[0059] Step 3: Set the laser power parameters to 2000W and the scanning speed to 6mm / s. Use a coaxial powder feeder containing FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0060] Example 4

[0061] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0062] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 100:2 and evenly applied to the surface of the substrate material. The substrate material is preheated to 180°C and kept at that temperature for 60 minutes.

[0063] The solid lubricant is 2% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0064] S1: Mix 5 kg of 1,1,3,3-tetramethyldisiloxane with 500 kg of toluene to obtain a mixed solution. Then add 100 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 6 hours.

[0065] S2: Add 0.1 kg of tetrabromobisphenol A dielyl ether, 3 kg of lanthanum acrylate, 0.1 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.05 kg of isopropanol solution of 0.1 mol / L chloroplatinic acid; stir at 57 °C for 100 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0066] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0067] The TiC powder is 5% of the FeCoCrNiMn high-entropy alloy powder by mass.

[0068] Step 3: Set the laser power parameters to 2200W and the scanning speed to 6mm / s. Use a coaxial powder feeder containing FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0069] Example 5

[0070] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0071] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 100:6 and evenly applied to the surface of the substrate material. The substrate material is preheated to 220℃ and kept at that temperature for 45 minutes.

[0072] The solid lubricant is 0.5% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0073] S1: Mix 6.5 kg of 1,1,3,3-tetramethyldisiloxane with 750 kg of toluene to obtain a mixed solution. Then add 110 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 8 hours.

[0074] S2: Add 0.25 kg of tetrabromobisphenol A dielyl ether, 4.5 kg of lanthanum acrylate, 0.3 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.2 kg of isopropanol solution of 0.25 mol / L chloroplatinic acid; stir at 63 °C for 125 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0075] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0076] The TiC powder is 7% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

[0077] Step 3: Set the laser power parameters to 1800W and the scanning speed to 8mm / s. Use a coaxial powder feeder loaded with FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0078] Example 6

[0079] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0080] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 100:6 and evenly applied to the surface of the substrate material. The substrate material is preheated to 220℃ and kept at that temperature for 45 minutes.

[0081] The solid lubricant is 1.2% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0082] S1: Mix 6.5 kg of 1,1,3,3-tetramethyldisiloxane with 750 kg of toluene to obtain a mixed solution. Then add 110 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 8 hours.

[0083] S2: Add 0.25 kg of tetrabromobisphenol A dielyl ether, 4.5 kg of lanthanum acrylate, 0.3 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.2 kg of isopropanol solution of 0.25 mol / L chloroplatinic acid; stir at 63 °C for 125 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0084] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0085] The TiC powder is 9% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

[0086] Step 3: Set the laser power parameters to 2000W and the scanning speed to 8mm / s. Use a coaxial powder feeder containing FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0087] Example 7

[0088] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0089] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 100:6 and evenly applied to the surface of the substrate material. The substrate material is preheated to 220℃ and kept at that temperature for 45 minutes.

[0090] The solid lubricant is 2% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0091] S1: Mix 6.5 kg of 1,1,3,3-tetramethyldisiloxane with 750 kg of toluene to obtain a mixed solution. Then add 110 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 8 hours.

[0092] S2: Add 0.25 kg of tetrabromobisphenol A dielyl ether, 4.5 kg of lanthanum acrylate, 0.3 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.2 kg of isopropanol solution of 0.25 mol / L chloroplatinic acid; stir at 63 °C for 125 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0093] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0094] The TiC powder comprises 13% of the FeCoCrNiMn high-entropy alloy powder by mass.

[0095] Step 3: Set the laser power parameters to 2200W and the scanning speed to 8mm / s. Use a coaxial powder feeder containing FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0096] Example 8

[0097] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0098] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 150:2 and evenly applied to the surface of the substrate material. The substrate material is preheated to 250°C and kept at that temperature for 30 minutes.

[0099] The solid lubricant is 0.5% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0100] S1: Mix 8 kg of 1,1,3,3-tetramethyldisiloxane with 1000 kg of toluene to obtain a mixed solution. Then add 120 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 10 hours.

[0101] S2: Add 0.5 kg of tetrabromobisphenol A dielyl ether, 6 kg of lanthanum acrylate, 0.6 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.4 kg of isopropanol solution of 0.5 mol / L chloroplatinic acid; stir at 68 °C for 150 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0102] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0103] The TiC powder is 16% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

[0104] Step 3: Set the laser power parameters to 1800W and the scanning speed to 10mm / s. Use a coaxial powder feeder containing FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0105] Example 9

[0106] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0107] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 150:2 and evenly applied to the surface of the substrate material. The substrate material is preheated to 250°C and kept at that temperature for 30 minutes.

[0108] The solid lubricant is 1.2% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0109] S1: Mix 8 kg of 1,1,3,3-tetramethyldisiloxane with 1000 kg of toluene to obtain a mixed solution. Then add 120 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 10 hours.

[0110] S2: Add 0.5 kg of tetrabromobisphenol A dielyl ether, 6 kg of lanthanum acrylate, 0.6 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.4 kg of isopropanol solution of 0.5 mol / L chloroplatinic acid; stir at 68 °C for 150 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0111] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0112] The TiC powder represents 18% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

[0113] Step 3: Set the laser power parameters to 2000W and the scanning speed to 10mm / s. Use a coaxial powder feeder containing FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0114] Example 10

[0115] This embodiment provides a method for preparing a high-hardness wear-resistant coating. The coating is prepared using the high-entropy alloy coating material from Example 1, and is carried out according to the following steps:

[0116] Step 1: The surface of the substrate material is sanded with SiC sandpaper and cleaned with anhydrous ethanol for pretreatment. The solid lubricant and organic binder water glass are mixed and stirred at a mass ratio of 150:2 and evenly applied to the surface of the substrate material. The substrate material is preheated to 250°C and kept at that temperature for 30 minutes.

[0117] The solid lubricant is 2% by mass of FeCoCrNiMn high-entropy alloy powder, and its preparation method is as follows:

[0118] S1: Mix 8 kg of 1,1,3,3-tetramethyldisiloxane with 1000 kg of toluene to obtain a mixed solution. Then add 120 kg of molybdenum disulfide powder to the mixed solution, ultrasonically disperse it evenly, heat it to reflux the toluene, stir and keep it at this temperature for 10 hours.

[0119] S2: Add 0.5 kg of tetrabromobisphenol A dielyl ether, 6 kg of lanthanum acrylate, 0.6 kg of 3-(2-carboxyvinyl)phenylboronic acid, and 0.4 kg of isopropanol solution of 0.5 mol / L chloroplatinic acid; stir at 68 °C for 150 min, centrifuge, and wash the precipitate with toluene to obtain lanthanum-doped solid lubricant.

[0120] Step 2: After ball milling and mixing FeCoCrNiMn high-entropy alloy powder and TiC powder, the mixture is deposited on a metal substrate by cold spraying to form a deposit. The deposit is then subjected to stirring and friction processing using a stirring head.

[0121] The TiC powder is 20% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

[0122] Step 3: Set the laser power parameters to 2200W and the scanning speed to 10mm / s. Use a coaxial powder feeder containing FeCoCrNiMn high-entropy alloy powder and TiC powder to feed the powder synchronously. Use laser cladding equipment to prepare the coating. During the laser cladding process, use argon as a protective gas.

[0123] The weld width (W / mm), weld height (H / mm), and weld depth (D / mm) of the laser cladding samples in Examples 2-10 were measured. Based on the measured data, α and β were defined as the aspect ratio and dilution rate of the cladding layer, respectively, and the calculation formulas are shown below. The experimental parameters and cladding layer morphology measurement results are shown in Tables 1 and 2, where the serial numbers correspond to the example serial numbers.

[0124]

[0125] Table 1. Experimental parameters and morphological measurement results of laser cladding FeCoCrNiMn layer.

[0126] Serial Number laser power Scan speed Melting point Melting depth Weld width Aspect Ratio Dilution rate No. P / W V:mm / s H / mm D / mm W / mm a β / ％ ① 1800 6 1.065 0.253 2.532 2.38 19.20 ② 2000 6 1.067 0.312 2.614 2.45 22.63 ③ 2200 6 1.068 0.421 2.745 2.57 28.27

[0127] Table 2 Experimental parameters and cladding layer morphology measurement results of laser cladding FeCoCrNiMn

[0128]

[0129]

[0130] Comparative analysis of the data in Tables 1 and 2 shows that when the scanning speed is 6 mm / s, both α and β increase with increasing laser power. The combined effect of different parameters can be represented by specific energy (E), as shown in the following formula.

[0131]

[0132] In the formula, P(W) is the laser power, V(mm / s) is the scanning rate, and D(mm) is the laser spot diameter. At a scanning speed of 6mm / s, as the laser power increases, the input specific energy gradually increases, the powder melting becomes more complete, and the longitudinal and lateral expansion properties of the cladding layer are also enhanced. However, since laser cladding is a surface modification technology, its dilution rate needs to be reduced accordingly, and it is currently generally limited to below 20% in the industrial field. Therefore, it can be concluded that the cladding layer prepared using a laser power of 1800W and a scanning speed of 6mm / s to 8mm / s has better forming quality and good hardness properties.

[0133] like Figure 2 The image shows the actual application effect of using high-entropy alloy coating materials: Taking the middle trough of a scraper conveyor as an example, it has suffered from serious wear and corrosion problems in the past few years, leading to frequent repairs and replacements. This not only increases maintenance costs but also causes production interruptions and losses.

[0134] Significant improvements were observed in coal mines after the installation and use of the high-entropy alloy coating material of this invention. Firstly, the service life of the central trough was significantly extended, and wear and corrosion problems were effectively controlled. Frequent maintenance and replacement of the central trough were no longer required, resulting in a substantial reduction in maintenance costs. Secondly, the excellent wear resistance and corrosion resistance of the high-entropy alloy coating material enabled the central trough to operate smoothly in harsh coal environments. The impact of coal wear and corrosion on the trough was greatly reduced, minimizing downtime and production interruptions, and improving production efficiency and output. Furthermore, the use of the high-entropy alloy coating material in the central trough also reduced energy consumption. The smooth surface of the coating reduced the frictional resistance between the coal and the trough wall, lowering energy consumption and operating costs. This also plays a positive role in the sustainable development and environmental protection of the mine.

[0135] In summary, the coal mine has achieved significant results in solving the wear and corrosion problems of the central trough by adopting the high-entropy alloy coating material of this invention. The service life of the central trough has been extended, maintenance costs have been reduced, production efficiency has been improved, and energy consumption has been reduced, bringing positive impacts to the coal mine's economic benefits and sustainable development.

[0136] Microstructure analysis of high-entropy alloy coating materials:

[0137] (1) XRD pattern analysis

[0138] Figure 3 XRD patterns and calibration results of FeCoCrNiMn coatings with different TiC contents are presented. Figure 3 As can be seen, when TiC is not added to the alloy, the diffraction peaks in the cladding layer are FCC and BCC. The reason for BCC is that the excessive cooling rate during the laser cladding process leads to lattice distortion.

[0139] With the addition of TiC, when the TiC content was 5%, no TiC diffraction peaks were clearly observed in the XRD pattern of the cladding layer; when the TiC content reached 10%, TiC diffraction peaks were clearly observed in the XRD pattern of the cladding layer; and when the TiC content reached 15%, the intensity and number of TiC diffraction peaks gradually increased. Therefore, the XRD diffraction pattern results of the cladding layer indicate that the addition of TiC did not change the phase composition of the FeCoCrNiMn cladding layer, but after the addition of TiC, TiC diffraction peaks appeared in the XRD pattern, and with the increase of TiC content, the number and intensity of the diffraction peaks corresponding to TiC increased.

[0140] (2) Metallographic analysis

[0141] Figure 4 Images (a) to (e) show the microstructure of cladding layers with different TiC addition amounts, magnified at 5000x. Figure 4 (a) It can be seen that when the TiC addition is 0%, the resulting cladding layer has a dense structure, no obvious impurities, and obvious dendrite boundaries. From Figure 4 (b) It can be seen that when the added TiC content reaches 5%, there are second phases of different shapes at the dendrite boundaries. The second phase region was analyzed using EDS energy dispersive spectroscopy, such as... Figure 5 The black area contains C and Ti elements, so the second term corresponding to the black area is always TiC; from Figure 4 (c) It can be seen that when the TiC content is 10%, the amount of TiC phase increases significantly, and a small amount of TiC phase aggregates into small pieces and is evenly distributed; from Figure 4 (e) It can be seen that when the TiC content increases to 20%, the aggregation degree of the TiC phase increases significantly, and a large amount of TiC aggregates and melts into blocks, which are unevenly distributed. Figure 5 The scanning energy spectrum is the result when the TiC content is 5%. Fe, Co, Cr, Ni and Mn elements are relatively uniformly distributed in the coating, while carbon and titanium elements are mainly distributed in the bulk second phase region, indicating that the bulk second phase is TiC.

[0142] Performance analysis of TiC / FeCoCrNiMn cladding layer:

[0143] (1) Hardness test analysis

[0144] To further investigate the effect of TiC on the hardness of the cladding layer, the microhardness of the cladding layer at different distances from the surface was tested. For example... Figure 6 This is a graph showing the hardness variation of the cladding layer with TiC content ranging from 0% to 20% at different distances from the surface. Figure 6It can be seen that the average hardness of the cladding layer increases with increasing TiC content, with the highest hardness value observed at 10% TiC content. This is because the second-phase reinforcement of TiC leads to the increase in coating hardness. These hard phases can effectively restrict dislocation movement, thereby improving the microhardness of the TiC / FeCoCrNiMn coating. The hardness of the 0% TiC and 5% TiC samples changes more smoothly with distance, while the hardness of the 10%, 15%, and 20% TiC samples fluctuates significantly with different surface distances. This is mainly due to the uneven size and distribution of the TiC precipitates.

[0145] (2) Friction and wear analysis of the cladding layer

[0146] The friction and wear test data are shown in Table 3. After processing the experimental data, the friction coefficient diagram and average friction coefficient diagram of the sample coating were plotted using Origin plotting software. The results are as follows: Figure 7 As shown, the coefficient of friction, as an important parameter for judging the wear resistance of a material, is affected by factors such as the material's inherent properties, the wear mechanism, and the roughness of the contact surface.

[0147] from Figure 7 It can be seen that the friction coefficient fluctuates greatly in the initial stage of the friction and wear experiment. When the experiment is carried out for about 5 minutes, the friction coefficient curve gradually stabilizes. Therefore, the friction coefficient value of 5 to 15 minutes after the experiment stabilizes is selected, and the average value of the friction coefficient within this time period is taken.

[0148] Therefore, the sample with a TiC content of 5% has the lowest average friction coefficient among all samples, at 0.530, exhibiting the best wear resistance. Figure 7 The trend of friction coefficients for each sample shows that as the TiC powder content gradually increases, the average friction coefficient curve first decreases and then gradually increases.

[0149] Table 3. Friction and Wear Experiment Data

[0150]

[0151] To investigate the wear mechanism, wear surfaces were compared, such as... Figure 8 The image shows the three-dimensional morphology of cladding layer samples after friction and wear of 0% TiC to 10% TiC. Figure 8 (a) As is known, the surface of the 0% TiC sample has many adhesives and deep grooves. This is because its cladding layer has high hardness, and the shear force between the cladding layer and the friction disk during friction causes significant plastic deformation of the coating, resulting in surface depressions that align with the sliding direction. Because the cladding layer has a large contact area with the friction disk, debris easily adheres to the surface, thus its wear mechanism is severe adhesive wear. The wear morphology of the 5% TiC sample is as follows: Figure 8As shown in (b), compared with 0% TiC, there is a significant reduction in adhesives and fewer abrasive particles distributed on the surface. Its main wear is adhesive wear and abrasive wear. Figure 8 (c) shows the wear morphology of the 10% TiC sample. The wear surface is uneven and has a lot of adhesive material, indicating severe adhesive wear and abrasive wear mechanism.

[0152] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method of producing a high hardness wear resistant coating, characterized by, The FeCoCrNiMn high-entropy alloy powder and TiC powder, wherein the TiC powder is 0-20% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

2. The method of claim 1, wherein the high hardness wear resistant coating is prepared by a process comprising: The mass fraction of each element in the FeCoCrNiMn high-entropy alloy powder is as follows: Fe 20-40 parts, Co 3-6 parts, Cr 18-36 parts, Ni 30-60 parts, and Mn 26-52 parts.

3. The method of claim 1, wherein the high hardness wear resistant coating is prepared by a process comprising: The method is implemented according to the following steps: Step 1, the surface of the base material is polished with SiC sandpaper and cleaned with anhydrous ethanol, and the solid lubricant and organic binder water glass are mixed and stirred in a mass ratio of 100-150:2-6, and then uniformly coated on the surface of the metal substrate, and the base material is preheated to 180-250 DEG C and kept for 30-60 minutes; Step 2, the FeCoCrNiMn high-entropy alloy powder and TiC powder are ball-milled and mixed, and then deposited on the metal substrate by cold spraying to form a deposited body, and then the deposited body is subjected to friction stir processing by using a stirring head; Step 3, the laser power parameter and scanning speed are set, and a coating is prepared by using a laser cladding device.

4. The method of claim 3, wherein the high hardness wear resistant coating is prepared by a process comprising: The laser power parameter is 1800W-2200W, and the scanning speed is 6mm / s-10mm / s.

5. The method of claim 4, wherein the high hardness wear resistant coating is formed by a process comprising: The laser power parameter is 1800W, and the scanning speed is 6mm / s-8mm / s.

6. The method of claim 3, wherein the high hardness wear resistant coating is formed by a process comprising: The coaxial powder feeder loaded with FeCoCrNiMn high-entropy alloy powder and TiC powder is used to synchronously feed the powder.

7. The method of claim 3, wherein the high hardness wear resistant coating is formed by a process comprising: In the process of laser cladding in step 2, argon is used as a protective gas.

8. The method of claim 3, wherein the high hardness wear resistant coating is formed by a process comprising: The solid lubricant is 0.5%-2% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder.

9. The method of claim 3, wherein the high hardness wear resistant coating is prepared by a process comprising: The preparation method of the solid lubricant is as follows: S1: 5-8 parts of 1,1,3,3-tetramethyldisiloxane and 500-1000 parts of toluene are mixed to obtain a mixed solution, then 100-120 parts of molybdenum disulfide powder is added to the mixed solution, ultrasonic dispersion is performed, heating is performed to toluene reflux, stirring and heat preservation are performed for 6-10 hours, S2: 0.05-0.5 parts of tetra bromo bisphenol A double allyl ether, 3-6 parts of lanthanum acrylate, 0.03-0.6 parts of 3-(2-carboxyvinyl) phenylboric acid, and 0.03-0.4 parts of chloroplatinic acid isopropyl alcohol solution are added, stirring is performed at 57-68 DEG C for 100-150 minutes, centrifugal separation is performed, the precipitate is washed with toluene, and a lanthanum-doped solid lubricant is obtained.

10. The method of claim 9, wherein the high hardness wear resistant coating is prepared by a process comprising: The concentration of chloroplatinic acid in the chloroplatinic acid isopropyl alcohol solution is 0.05-0.5mol / L.

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