A high-entropy alloy coating material, its preparation method and application

Abstract

This invention belongs to the field of high-entropy alloy technology, specifically relating to a high-entropy alloy coating material, its preparation method, and its application. The high-entropy alloy coating material is composed of AlCrTiCuMo powder, nano-SiO2, and carbon nanotubes, wherein the AlCrTiCuMo powder comprises 80-90 wt%, nano-SiO2 10-20 wt%, and carbon nanotubes 0.1-1 wt%. It is used to solve the problem that the lack of a protective coating on the inner wall of 13Cr oil well pipes leads to varying degrees of corrosion and sand erosion, thus affecting the service life of the 13Cr oil well pipes. Furthermore, during use, phenomena such as asphalt deposition, wax formation, scaling, formation sand production, and salt formation can easily cause blockages in the 13Cr oil well pipes.

Description

Technical Field

[0001] This invention belongs to the field of high-entropy alloy technology, specifically relating to a high-entropy alloy coating material, its preparation method, and its application. Background Technology

[0002] With the continuous increase in energy demand, the ongoing exploration and development of oil and gas resources has led to the gradual depletion of shallow oil and gas resources. The focus of oil and gas resource extraction has shifted from shallow oil and gas wells to deep and ultra-deep wells. Furthermore, with the continuous increase in well depth, the environment of the extraction wells becomes increasingly harsh. Oil well casings can reach depths of 8000-10000m, with underground temperatures reaching 100℃-300℃, and must also withstand complex and variable surface loads.

[0003] Because 13Cr oil well tubing lacks a protective coating on its inner wall, it is susceptible to corrosion from organic and inorganic salts, hydrogen sulfide, and carbon dioxide present in crude oil. Sand particles mixed in with the oil and gas can also erode the tubing, affecting its lifespan. Furthermore, during use, 13Cr oil well tubing is prone to blockage due to asphalt deposition, wax formation, scaling, formation sand production, and salt deposits. Summary of the Invention

[0004] Based on the problems mentioned in the background art above, the present invention provides a high-entropy alloy coating material, its preparation method and application, to solve the problem that the lack of a protective coating material on the inner wall of 13Cr oil well pipes leads to varying degrees of corrosion and sand erosion inside the 13Cr oil well pipes, thereby affecting the service life of the 13Cr oil well pipes. Furthermore, during use, phenomena such as asphalt deposition, waxing, scaling, formation sand production and salt formation can easily cause blockage of 13Cr oil well pipes.

[0005] The technical solution adopted in this invention is as follows:

[0006] A high-entropy alloy coating material is composed of AlCrTiCuMo powder, nano-SiO2 and carbon nanotubes, wherein AlCrTiCuMo powder is 80-90wt%, nano-SiO2 is 10-20wt% and carbon nanotubes are 0.1-1wt%.

[0007] Furthermore, the AlCrTiCuMo powder contains 86 wt%, nano-SiO2 13.3 wt%, and carbon nanotubes 0.7 wt%.

[0008] Furthermore, the alloy composition of the AlCrTiCuMo powder is Al: 20-25wt%, Cr: 20-23wt%, Ti: 21-25wt%, Cu: 15-20wt%, and Mo: 15-20wt%.

[0009] Furthermore, the alloy composition of the AlCrTiCuMo powder is Al: 23wt%, Cr: 22wt%, Ti: 23wt%, Cu: 17wt%, and Mo: 15wt%.

[0010] Furthermore, in the AlCrTiCuMo powder, Al, Cr, Ti, Cu, and Mo are spherical powders with a purity ≥99% and a particle size of 45–105 μm; the nano-SiO2 is 300 nm spherical nano-SiO2.

[0011] A method for preparing a high-entropy alloy coating material.

[0012] Includes the following steps:

[0013] S1: Place ingots of Al, Cr, Ti, Cu, and Mo into a vacuum furnace, turn on the atomization device, gas supply system, cooling system, powder collection device, etc., and prepare AlCrTiCuMo powder by vacuum argon atomization method, and screen out powder with a size of 45-105 micrometers.

[0014] S2: Weigh AlCrTiCuMo powder, nano SiO2 and carbon nanotubes according to the following ratio: AlCrTiCuMo powder 80-90wt%, nano SiO2 10-20wt%, and carbon nanotubes 0.1-1wt%.

[0015] Carbon nanotubes were dispersed, weighed, and then anhydrous ethanol was added for ultrasonic dispersion.

[0016] A mixture of AlCrTiCuMo powder and nano-SiO2 powder was added to a carbon nanotube dispersion and mixed with magnetic stirring at room temperature. The three mixed powders were then placed in a ball mill for ball milling.

[0017] S3: Place the mixed AlCrTiCuMo powder, nano SiO2 powder and carbon nanotube powder into a vacuum dryer for drying.

[0018] Furthermore, in step S2, the ultrasonic dispersion time is 1-2 hours; the magnetic stirring parameters are set as follows: stirring time 30-50 min, rotation speed 300-500 r / min; the ball mill parameters are set as follows: rotation speed 200-300 r / min, ball milling time 1-2 h, and the mass ratio of grinding balls to material is 3:1; in step S3, the vacuum dryer drying parameters are set as follows: drying time 2-3 hours, drying temperature 60-100℃.

[0019] An application of a high-entropy alloy coating material, wherein the high-entropy alloy coating material is laser-fused onto 13Cr oil well tubing.

[0020] Furthermore, the following steps are included:

[0021] L1: Pre-treatment of the inner surface of 13Cr oil well pipe: First, sand the inner surface of 13Cr oil well pipe with sandpaper, then clean it with alcohol and acetone to remove the surface oxide film and oil stains, and finally sandblast it; after cleaning, use a resistance heater to preheat the 13Cr oil well pipe.

[0022] L2: Laser cladding: The dried high-entropy alloy powder is loaded into the powder feeder, and then the laser cladding robot, laser and powder feeder are turned on in sequence to start the laser cladding;

[0023] L3: Laser remelting: After laser cladding, it is then subjected to laser cladding again.

[0024] Furthermore, in step L2, the laser is a laser robot, and the laser cladding method uses coaxial powder feeding; the laser cladding parameters are set as follows: laser power of 2000W, scanning speed of 3mm / min, spot diameter of 3mm, powder feeding speed of 20g / min, and overlap rate of 30%; single-layer cladding is performed, and the cladding layer thickness is 0.5mm; no protective gas is required during the laser cladding process; in step L3, the laser remelting parameters are set as 1500W laser power and 2mm / min scanning speed.

[0025] The beneficial effects of this invention are:

[0026] 1. This invention uses AlCrTiCuMo powder, which is laser-clad onto the inner wall of 13Cr oil well pipe, giving the 13Cr oil well pipe high strength, wear resistance, and corrosion resistance, and can form a dense oxide film to further improve corrosion resistance.

[0027] 2. This invention adds nano-SiO2 to AlCrTiCuMo powder, which can act as a ceramic reinforcing phase, promote the formation of oxide film, and increase the compactness and density of the coating; the addition of carbon nanotubes utilizes the excellent mechanical and thermal conductivity of carbon nanotubes to further improve the coating performance, reduce or disperse thermal stress, improve thermal stability and durability, and play an interface strengthening role.

[0028] 3. This invention uses three powders, AlCrTiCuMo powder, nano-SiO2, and carbon nanotubes, to laser clad, which can increase the hardness, wear resistance, and corrosion resistance of the coating and form a more uniform and dense glassy coating. The glassy coating has high hardness, good wear and corrosion resistance, and excellent surface smoothness, which can reduce friction and particle adhesion, and reduce the occurrence of blockage inside the tube.

[0029] 4. The AlCrTiCuMo powder produced by the present invention using vacuum argon atomization method has high particle size uniformity, narrower particle size distribution, more regular particle shape, good powder controllability, and high powder purity. Attached Figure Description

[0030] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0031] Figure 1 Comparison of the shapes of AlCrTiCuMo powder prepared by vacuum argon atomization and conventional preparation methods;

[0032] Figure 2 The comparative experimental data charts are shown in Example 2.

[0033] Figure 3 This is a surface morphology diagram of the composite coating. Detailed Implementation

[0034] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0035] Example 1

[0036] A high-entropy alloy coating material is composed of AlCrTiCuMo powder, nano-SiO2 and carbon nanotubes, wherein AlCrTiCuMo powder is 80-90wt%, nano-SiO2 is 10-20wt% and carbon nanotubes are 0.1-1wt%.

[0037] The alloy composition of the AlCrTiCuMo powder is Al: 20-25wt%, Cr: 20-23wt%, Ti: 21-25wt%, Cu: 15-20wt%, and Mo: 15-20wt%.

[0038] Example 2

[0039] A method for preparing a high-entropy alloy coating material.

[0040] Includes the following steps:

[0041] S1: Place ingots of Al, Cr, Ti, Cu, and Mo into a vacuum furnace, turn on the atomization device, gas supply system, cooling system, powder collection device, etc., and prepare AlCrTiCuMo powder by vacuum argon atomization method, and screen out powder with a size of 45-105 micrometers.

[0042] S2: Weigh AlCrTiCuMo powder, nano SiO2 and carbon nanotubes according to the following ratio: AlCrTiCuMo powder 80-90wt%, nano SiO2 10-20wt%, and carbon nanotubes 0.1-1wt%.

[0043] Carbon nanotubes were dispersed, weighed, and then anhydrous ethanol was added for ultrasonic dispersion.

[0044] A mixture of AlCrTiCuMo powder and nano-SiO2 powder was added to a carbon nanotube dispersion and mixed with magnetic stirring at room temperature. The three mixed powders were then placed in a ball mill for ball milling.

[0045] S3: Place the mixed AlCrTiCuMo powder, nano SiO2 powder and carbon nanotube powder into a vacuum dryer for drying.

[0046] In step S2, the ultrasonic dispersion time is 1-2 hours; the magnetic stirring parameters are set as follows: stirring time 30-50 min, rotation speed 300-500 r / min; the ball mill parameters are set as follows: rotation speed 200-300 r / min, ball milling time 1-2 h, and the mass ratio of grinding balls to material is 3:1; in step S3, the vacuum dryer drying parameters are set as follows: drying time 2-3 hours, drying temperature 60-100℃.

[0047] In this solution, the carbon nanotubes and nano-SiO2 are existing technologies and were purchased from Dongguan Kelude Experimental Equipment Technology Co., Ltd. and Shanghai McLean Reagent Co., Ltd., respectively.

[0048] In preparing AlCrTiCuMo powder, this method uses vacuum argon atomization. The performance comparison between this method and AlCrTiCuMo powder prepared by conventional methods is as follows:

[0049] 1. High particle size uniformity: Gas atomization powder production technology can produce very uniform particle size, with a narrower particle size distribution and more regular particle shape. In contrast, traditional powder production technologies often produce powders with a wider particle size distribution and irregular particle shape. Highly uniform particle size can improve product stability and consistency, making it suitable for applications requiring high precision.

[0050] 2. Excellent powder controllability: Air atomization powder production equipment can achieve precise control over the particle size and shape of powder by adjusting process parameters. Traditional powder production technology often relies on mechanical grinding or particle crushing to adjust the particle size, which is often not precise and controllable enough.

[0051] 3. High powder purity: Gas atomization powder production technology can produce high-purity powder products because a high degree of physical isolation and anti-contamination measures can be achieved during the gas atomization process. In contrast, traditional powder production technologies are often affected by impurities and contaminants introduced by mechanical grinding processes, making it difficult to obtain highly pure powder products.

[0052] Furthermore, a structural comparison of AlCrTiCuMo powder prepared by vacuum argon atomization and conventional methods can be found in the appendix of the instruction manual. Figure 1 .

[0053] For the preparation of AlCrTiCuMo powder in this scheme:

[0054] In Example 1, raw materials in the following proportions were selected and prepared according to the steps in S1 of Example 2. The resulting AlCrTiCuMo powder, made from metal elements such as Al, Cr, Ti, Cu, and Mo in different weight ratios, was applied to 13Cr oil well tubing. Strength, wear resistance, and corrosion resistance tests were conducted on the 13Cr oil well tubing, and the data obtained are as follows:

[0055] 1. Strength test:

[0056] Compressive strength test: The AlCrTiCuMo powder sample was placed in a universal testing machine and gradually increased pressure was applied. The stress-strain curve was observed to analyze its compressive strength and deformation characteristics.

[0057] 2. Abrasion resistance test:

[0058] Wear testing: A wear testing machine (e.g., a ball-and-disc wear tester) is used to simulate the friction between a material surface and another material. A certain load and frictional motion are applied, and the wear amount and coefficient of friction of the AlCrTiCuMo powder sample are measured to analyze its wear resistance.

[0059] 3. Corrosion resistance test:

[0060] Salt spray test: AlCrTiCuMo powder samples are placed in a salt spray test chamber to simulate corrosion conditions under working conditions. The degree of corrosion and surface changes of the samples are observed over a certain period of time to evaluate their corrosion resistance.

[0061] Aluminum (AL): One of the fundamental elements in high-entropy alloys, it possesses good strength and toughness, and provides excellent corrosion resistance. The addition of aluminum can increase the alloy's oxidation resistance and improve the wear resistance and corrosion resistance of the coating.

[0062] Chromium (Cr): Can increase the hardness, wear resistance, and corrosion resistance of high-entropy alloys. Chromium can form a multiphase structure with high hardness and strength, improving the wear resistance and corrosion resistance of coatings.

[0063] Titanium (Ti): Titanium is a strengthening element that can effectively increase the mechanical properties of high-entropy alloys. The addition of titanium can improve the hardness, fatigue resistance, and strength of high-entropy alloys, making the coating more durable and wear-resistant.

[0064] Copper (Cu): Copper is an element with good electrical and thermal conductivity, playing a role in solid solution strengthening and grain boundary strengthening in high-entropy alloys. The addition of copper can improve the strength and toughness of high-entropy alloys and enhance their electrical conductivity.

[0065] Molybdenum (Mo): It possesses excellent corrosion resistance and high-temperature strength. The addition of molybdenum can improve the wear resistance, corrosion resistance, and high-temperature strength of high-entropy alloys, and plays a role in strengthening and stabilizing the microstructure in coatings.

[0066] All five elements mentioned above have good resistance to hydrogen sulfide and carbon dioxide corrosion. After laser cladding, the coating has high strength, wear resistance, and corrosion resistance, and can form a dense oxide film to further improve corrosion resistance.

[0067] In this scheme, a high-entropy alloy coating material is provided, which is composed of AlCrTiCuMo powder, nano-SiO2 and carbon nanotubes, and the alloy composition of AlCrTiCuMo powder is Al: 20-25wt%, Cr: 20-23wt%, Ti: 21-25wt%, Cu: 15-20wt%, and Mo: 15-20wt%.

[0068] Table 1: Experimental data on the strength, wear resistance, and corrosion resistance of 13Cr oil well pipes after AlCrTiCuMo powder prepared with different weight ratios of various metal elements was applied to 13Cr oil well pipes.

[0069]

[0070] As shown in Table 1, when Al: 23wt%, Cr: 22wt%, Ti: 23wt%, Cu: 17wt%, and Mo: 15wt%, the AlCrTiCuMo powder prepared has better strength and the lowest weight loss due to erosion and corrosion, making it the optimal solution in this study.

[0071] In this scheme, by adding nano-SiO2 to AlCrTiCuMo powder, it can act as a ceramic reinforcing phase, promote the formation of oxide film, and increase the compactness and density of the coating. The addition of carbon nanotubes utilizes the excellent mechanical and thermal conductivity of carbon nanotubes to further improve the coating performance, reduce or disperse thermal stress, improve thermal stability and durability, and play an interface strengthening role. Furthermore, the coating made by mixing AlCrTiCuMo powder, nano-SiO2, and carbon nanotubes has better hardness, wear resistance, and corrosion resistance, and forms a more uniform and dense glassy coating. The glassy coating has high hardness, good wear and corrosion resistance, and excellent surface smoothness, which can reduce friction and particle adhesion, and reduce the occurrence of blockage inside the tube.

[0072] The following comparison of several embodiments of this solution yields Embodiments 3-6, as detailed below:

[0073] Example 3:

[0074] A high-entropy alloy coating material is composed of AlCrTiCuMo powder, nano-SiO2, and carbon nanotubes, wherein the AlCrTiCuMo powder is 80 wt%, the nano-SiO2 is 19.9 wt%, and the carbon nanotubes are 0.1 wt%.

[0075] The alloy composition of the AlCrTiCuMo powder is Al: 23wt%, Cr: 22wt%, Ti: 23wt%, Cu: 17wt%, and Mo: 15wt%.

[0076] The AlCrTiCuMo powder contains Al, Cr, Ti, Cu, and Mo as spherical powders with a purity ≥99% and a particle size of 45–105 μm; the nano-SiO2 is 300 nm spherical nano-SiO2.

[0077] Example 4:

[0078] The only difference between this embodiment and Embodiment 3 is that the AlCrTiCuMo powder contains 83wt%, nano-SiO2 contains 16.6wt%, and carbon nanotubes contain 0.4wt%.

[0079] Example 5:

[0080] The only difference between this embodiment and Embodiment 3 is that the AlCrTiCuMo powder contains 86 wt%, nano-SiO2 contains 13.3 wt%, and carbon nanotubes contain 0.7 wt%.

[0081] Example 6:

[0082] The only difference between this embodiment and Embodiment 3 is that the AlCrTiCuMo powder contains 90wt%, nano-SiO2 contains 9wt%, and carbon nanotubes contain 1wt%.

[0083] Table 2: Components of Examples 3-6

[0084]

[0085] The coating prepared using the above four proportions of raw materials was applied to 13Cr oil well tubing. The strength, hardness, high-temperature resistance, wear resistance, corrosion resistance, thermal conductivity, and stress concentration changes of the 13Cr oil well tubing were then tested, and the corresponding data are as follows:

[0086] Strength test:

[0087] Compressive strength test: The sample is placed in a universal testing machine and gradually increased pressure is applied. The stress-strain curve is observed to analyze its compressive strength and deformation characteristics.

[0088] Shear strength and yield strength testing: During testing, the sample is placed on a shear testing machine, and the shear force is gradually increased until the material fractures. The shear strength and yield strength of the material are obtained from the stress-strain curve recorded by the testing machine.

[0089] Abrasion resistance test:

[0090] Wear test: A reciprocating wear tester is used to simulate friction between materials. The indenter applies a certain load to the sample and performs reciprocating frictional motion. The wear amount and friction coefficient of the sample are measured, and the wear traces of the worn sample are analyzed to determine its wear resistance.

[0091] Corrosion resistance test:

[0092] The samples were exposed to different acidic or alkaline solutions, such as acids or alkalis, to assess their resistance to acid and alkali corrosion. The corrosion condition, mass loss, and surface changes on the sample surface were observed to analyze their corrosion resistance.

[0093] Hardness test:

[0094] The hardness of the coating and the substrate was tested using a microhardness tester, and the improvement in coating hardness was compared.

[0095] High temperature resistance test:

[0096] Thermogravimetric analysis (TGA) test: The thermal stability of a material is determined by measuring the change in mass of a sample after heating it at a controlled temperature.

[0097] thermal conductivity

[0098] In the heat flow method, a sample of uniform thickness is inserted between two plates, and a specific temperature gradient is established. A calibrated heat flow sensor is used to measure the heat flow through the sample, with the sensor in contact with the sample between the plates. By measuring the sample thickness, the temperature gradient between the upper and lower plates, and the heat flow through the sample, the thermal conductivity of the sample can be calculated.

[0099] Stress Concentration Variation

[0100] Fatigue test: By applying load to the actual sample block and recording the number of loading cycles and stress level, the deformation and damage caused by stress concentration are detected, so as to calculate the stress concentration factor.

[0101] Table 3: Data on the changes in strength, hardness, high-temperature resistance, wear resistance, corrosion resistance, thermal conductivity, and stress concentration of 13Cr oil well pipes after the coatings prepared with the above four raw material ratios are applied to the pipes.

[0102]

[0103] As shown in Tables 2 and 3, in this scheme, the coating made with 86wt% AlCrTiCuMo powder, 13.3wt% nano-SiO2, and 0.7wt% carbon nanotubes exhibits the best strength and hardness when applied to 13Cr oil well pipes. It also has the lowest resistance to high-temperature oxidation, wear resistance, corrosion resistance, and stress concentration factor, making it the optimal solution in this scheme.

[0104] Comparative Example 1:

[0105] When this high-entropy alloy coating material was applied to 13Cr oil well tubing, the performance of the improved 13Cr oil well tubing was compared with that of the unimproved 13Cr oil well tubing, and the performance data are as follows:

[0106] Table 4: Performance Comparison Data of Improved and Unimproved 13Cr Oil Well Pipes

[0107]

[0108] Example 7:

[0109] An application of a high-entropy alloy coating material, wherein the high-entropy alloy coating material is laser-clad onto a 13Cr oil well pipe;

[0110] Includes the following steps:

[0111] L1: Pre-treatment of the inner surface of 13Cr oil well pipe: First, sand the inner surface of 13Cr oil well pipe with sandpaper, then clean it with alcohol and acetone to remove the surface oxide film and oil stains, and finally sandblast it; after cleaning, use a resistance heater to preheat the 13Cr oil well pipe.

[0112] L2: Laser cladding: The dried high-entropy alloy powder is loaded into the powder feeder, and then the laser cladding robot, laser and powder feeder are turned on in sequence to start the laser cladding;

[0113] L3: Laser remelting: After laser cladding, it is then subjected to laser cladding again.

[0114] In step L2, a laser robot is used as the laser, and the laser cladding method adopts a coaxial powder feeding method. The laser cladding parameters are set as follows: laser power of 2000W, scanning speed of 3mm / min, spot diameter of 3mm, powder feeding speed of 20g / min, and overlap rate of 30%. Single-layer cladding is performed, and the cladding layer thickness is 0.5mm. No protective gas is required during the laser cladding process. In step L3, the laser remelting parameters are set as follows: laser power of 1500W and scanning speed of 2mm / min.

[0115] By laser cladding the coating onto the wall of the 13Cr oil well pipe according to the steps in Example 7 above, the laser-clad AlCrTiCuMo high-entropy alloy coating will spontaneously form oxides such as aluminum oxide, chromium oxide, and titanium oxide, giving the coating high strength and hardness, good high-temperature oxidation resistance, and excellent wear and corrosion resistance.

[0116] The carbon nanotubes added to the coating can enhance the thermal conductivity and corrosion resistance of the high-entropy alloy coating and reduce stress concentration; the added nano-SiO2 powder can enhance the performance of the high-entropy alloy coating, improve its strength, wear resistance and wear resistance, reduce stress concentration, and after laser cladding, a glassy coating can be generated, which can isolate oil and gas and reduce corrosion.

[0117] Three powders were added to the laser cladding process to increase the coating's hardness, wear resistance, and corrosion resistance, forming a more uniform and dense glassy coating. This glassy coating exhibits high hardness, excellent wear and corrosion resistance, and the addition of nano-SiO2 forms a lubricating film on the friction surface, reducing direct metal-to-metal contact. The addition of carbon nanotubes provides additional lubrication, reducing friction and wear. Furthermore, the glassy coating formed by the alloy powder under laser irradiation also enhances lubrication, resulting in excellent smoothness on the inner surface of the improved 13Cr oil well pipe, reducing friction and particle adhesion, and minimizing pipe blockage.

[0118] Comparative Example 2:

[0119] The improved 13Cr oil well tubing and the original 13Cr oil well tubing were compared under the same environmental conditions and service period. The thickness and density of scale buildup on the inner walls of the two tubings were compared, and the comparative experimental data can be found in the attached rectangular chart in the instruction manual. Figure 2 ;

[0120] As attached Figure 2 As shown, the surface roughness of the 13Cr oil well pipe before improvement is greater than that of the 13Cr oil well pipe after improvement, and the mass of the 13Cr oil well pipe before improvement is also greater than that of the 13Cr oil well pipe after improvement. This means that the inner wall of the 13Cr oil well pipe after improvement is less prone to the accumulation of dirt and reduces the risk of blockage of the inner wall of the oil well pipe.

[0121] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A high-entropy alloy coating material, characterized in that: The high-entropy alloy coating material is composed of AlCrTiCuMo powder, nano-SiO2, and carbon nanotubes. The AlCrTiCuMo powder contains 86 wt%, nano-SiO2 contains 13.3 wt%, and carbon nanotubes contain 0.7 wt%. The alloy composition of the AlCrTiCuMo powder is Al: 23 wt%, Cr: 22 wt%, Ti: 23 wt%, Cu: 17 wt%, and Mo: 15 wt%. After laser cladding, the high-entropy alloy coating material forms a uniform, dense, glassy, ​​smooth coating.

2. The high-entropy alloy coating material according to claim 1, characterized in that: The nano-SiO2 is 300nm spherical nano-SiO2.

3. A method for preparing the high-entropy alloy coating material according to claim 1, characterized in that: Includes the following steps: S1: Place ingots of Al, Cr, Ti, Cu, and Mo into a vacuum furnace, turn on the atomization device, gas supply system, cooling system, and powder collection device, and prepare AlCrTiCuMo powder using the vacuum argon atomization method, and screen out powders of 45-105 micrometers. S2: Weigh AlCrTiCuMo powder, nano SiO2 and carbon nanotubes according to the following proportions: AlCrTiCuMo powder 86wt%, nano SiO2 13.3wt%, and carbon nanotubes 0.7wt%. Dispersing carbon nanotubes: After weighing the carbon nanotubes, add anhydrous ethanol and disperse them using ultrasound. The mixed powder of AlCrTiCuMo powder and nano SiO2 was added to the carbon nanotube dispersion and mixed magnetically at room temperature. The mixed powder was then placed in a ball mill for ball milling. S3: The ball-milled AlCrTiCuMo powder, nano-SiO2 powder and carbon nanotube mixed powder are placed in a vacuum dryer for drying to obtain a high-entropy alloy coating material.

4. The preparation method according to claim 3, characterized in that: In step S2, the ultrasonic dispersion time is 1-2 hours; the magnetic stirring parameters are set as follows: stirring time 30-50 min, rotation speed 300-500 r / min; the ball mill parameters are set as follows: rotation speed 200-300 r / min, ball milling time 1-2 h, and the mass ratio of grinding balls to material is 3:1; in step S3, the vacuum dryer drying parameters are set as follows: drying time 2-3 hours, drying temperature 60-100℃.

5. An application of the high-entropy alloy coating material according to claim 1, characterized in that: The high-entropy alloy coating material was laser-fused onto a 13Cr oil well pipe.

6. The application according to claim 5, characterized in that: Includes the following steps: L1: Pre-treatment of the inner surface of 13Cr oil well pipe: First, sand the inner surface of 13Cr oil well pipe with sandpaper, then clean it with alcohol and acetone to remove the surface oxide film and oil stains, and finally sandblast it; after cleaning, use a resistance heater to preheat the 13Cr oil well pipe. L2: Laser Cladding: The dried high-entropy alloy coating material is loaded into the powder feeder. Then, the laser cladding robot, laser, and powder feeder are turned on in sequence to start laser cladding. The laser cladding method adopts coaxial powder feeding. The laser cladding parameters are set as follows: laser power of 2000W, scanning speed of 3mm / min, spot diameter of 3mm, powder feeding speed of 20g / min, and overlap rate of 30%. Single-layer cladding is performed, with a cladding layer thickness of 0.5mm. No protective gas is required during the laser cladding process. L3: Laser remelting: After laser cladding, laser remelting is performed. The laser remelting parameters are set to a laser power of 1500W and a scanning speed of 2mm / min.

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