A refractory high-entropy alloy coating and method of making

Abstract

The application discloses a kind of refractory high-entropy alloy powder for ultra-high-speed laser cladding, and relates to the technical field of surface engineering.The refractory high-entropy alloy powder of the application is composed of seven elements of Nb, Mo, Ta, W, V, Cr and Si, and contains 15-18% of Nb, 15-18% of Mo, 15-18% of Ta, 15-18% of W, 15-18% of V, 15-18% of Cr and 1-2% of Si in terms of atomic percentage.The refractory high-entropy alloy composite powder of the application is prepared into a refractory high-entropy alloy coating by ultra-high-speed laser cladding technology.The obtained coating is metallurgically bonded with the substrate, has no cracks, and has excellent high-temperature resistance, wear resistance and corrosion resistance.The preparation efficiency is high, the thermal influence on the substrate is small, and the coating can be used for surface protection and remanufacturing of key high-temperature components in aerospace, nuclear power and other fields serving in extreme working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of surface engineering, and in particular to a refractory high-entropy alloy powder for ultra-high-speed laser cladding, a coating thereof and a preparation method. BACKGROUND

[0002] High-temperature components such as aerospace engines and nuclear reactors need to serve in extreme environments of ultra-high-temperature corrosion for a long time, and extremely stringent requirements are put forward for the high-temperature resistance, corrosion resistance, strength and other properties of the materials. The most commonly used nickel-based high-temperature alloy is limited by the melting point, and its service temperature is lower than 1200℃, so it is urgent to develop new high-temperature resistant alloy materials that can withstand higher temperatures.

[0003] As a new and popular metal material, high-entropy alloy has high hardness, strong oxidation resistance, outstanding mechanical properties, excellent wear resistance and corrosion resistance due to its unique design concept and high entropy, lattice distortion, slow diffusion and cocktail effect. In particular, refractory high-entropy alloy is a new multi-principal-element alloy developed on the basis of high-entropy alloy, mainly composed of refractory metal elements (melting point higher than 1650℃, such as Nb, Ta, Mo, W, V, etc.), and has high strength, high specific strength, high-temperature resistance and radiation resistance, etc. It has a very broad application prospect in the fields of aerospace, nuclear reactors and other fields.

[0004] Ultra-high-speed laser cladding technology is a new surface engineering technology, which has a special melting method different from traditional laser cladding technology, and the deposition rate can be increased to 20-500m / min, which is 100-250 times of traditional laser cladding, and the overall processing efficiency is increased by 3-5 times. Ultra-high-speed laser cladding is expected to become a revolutionary alternative technology to traditional coating technology due to its high efficiency, high performance, green energy saving and environmental protection, and provides an effective means for the preparation and application of refractory high-entropy alloy coatings. However, at present, there is still a lack of powder raw materials and coating preparation technology special for ultra-high-speed laser cladding technology. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provides a refractory high-entropy alloy powder for ultra-high-speed laser cladding, a coating thereof and a preparation method. The refractory high-entropy alloy coating of the present application is metallurgically combined with the substrate without cracks, and the coating has excellent high-temperature resistance, wear resistance and corrosion resistance, high preparation efficiency and small thermal influence on the substrate, and can be used for surface protection and remanufacturing of key high-temperature components such as aerospace and nuclear power in extreme working conditions.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] In a first aspect, the present application provides a refractory high-entropy alloy powder for ultra-high-speed laser cladding, which contains 15-18% Nb, 15-18% Mo, 15-18% Ta, 15-18% W, 15-18% V, 15-18% Cr and 1-2% Si in terms of atomic percentage.

[0008] In the present application, the seven-element high-entropy alloy is formed by the synergistic compounding of Nb, Mo, Ta, W, V, Cr and Si, and the BCC solid solution phase and Laves phase with high thermal stability can be formed in the process of ultra-high-speed laser cladding, which has the high-entropy effect in thermodynamics, the lattice distortion effect in structure, the delayed diffusion effect in kinetics and the cocktail effect in performance, thereby having excellent high-temperature resistance, high strength, radiation resistance and other excellent properties. In addition, the Laves phase with high melting point and medium density is formed by the synergistic compounding of Nb, Mo, Ta, W, V, Cr and Si in a specific ratio, which further improves the high-temperature strength and creep resistance of the refractory high-entropy alloy, and improves the oxidation resistance and hot corrosion resistance at high temperature.

[0009] Preferably, the refractory high-entropy alloy powder contains 16-17% Nb, 16-17% Mo, 16-17% Ta, 16-17% W, 16-17% V, 16-17% Cr and 1.2-1.8% Si.

[0010] In the present application, the above-mentioned Nb, Mo, Ta, W, V, Cr and Si are compounded in the above-mentioned ratio, so that the powder composition is uniform, the sphericity and flowability are excellent, and the particle size distribution of the refractory high-entropy alloy powder is uniform, which is very suitable for ultra-high-speed laser cladding technology.

[0011] Preferably, the sphericity of the refractory high-entropy alloy powder is 95-100%.

[0012] In the present application, if the sphericity of the refractory high-entropy alloy powder is less than 95%, the coating forming quality is poor and has many defects; when the sphericity is 95-100%, the coating forming quality is better and the performance of the coating is better.

[0013] Preferably, the particle size distribution range of the refractory high-entropy alloy powder is 15-85 μm, the D50 is 35-65 μm, and the flowability is 15-20 s / 50 g.

[0014] In the present application, the particle size of the refractory high-entropy alloy powder affects the performance of the coating. If D50 is less than 35 microns, the powder as a whole is too fine, resulting in poor powder feeding effect, and further causing poor coating forming quality. If D50 is greater than 65 microns, the powder as a whole is too coarse, resulting in that the laser cannot fully melt the powder, and further causing poor coating forming quality. In addition, the flowability also affects the quality and performance of the coating forming. Therefore, the present application controls the above parameters within a certain range, which can better improve the quality and performance of the coating forming.

[0015] In a second aspect, the present application provides a refractory high-entropy alloy coating deposited on the surface of a substrate by the above refractory high-entropy alloy powder through ultra-high-speed laser cladding.

[0016] Preferably, the thickness of the refractory high-entropy alloy coating is 0.5-2 mm.

[0017] In the present application, if the thickness of the refractory high-entropy alloy coating is less than 0.5 mm, the coating is too thin, the forming quality is difficult to control, and the forming quality is poor. If the thickness of the refractory high-entropy alloy coating is greater than 2 mm, the coating is too thick, the coating forming stress is large, which causes the coating to easily crack and the bonding effect to be poor. Therefore, the present application controls the thickness of the coating within a certain range, which is beneficial to improve the quality and performance of the coating forming.

[0018] Preferably, the thickness of the refractory high-entropy alloy coating can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, or any other value within the range of 0.5-2 mm.

[0019] Preferably, the refractory high-entropy alloy coating has BCC phase and Laves phase.

[0020] In the present application, during the ultra-high-speed laser cladding process, the elements diffuse with each other, and the non-equilibrium solidification forms BCC phase and Laves phase, so that the refractory high-entropy alloy coating has BCC phase and Laves phase. Compared with the existing FCC solid solution phase, the hardness of the refractory high-entropy alloy coating of the present application is higher, and the wear resistance and high-temperature performance are better.

[0021] In a third aspect, the present application provides a preparation method of a refractory high-entropy alloy coating, which deposits the above refractory high-entropy alloy powder on the surface of a substrate by ultra-high-speed laser cladding.

[0022] Preferably, the process parameters of the ultra-high-speed laser cladding include: laser power is 2800-3500 W, spot diameter is 0.8-1.2 mm, powder feeding rate is 1.5-2.0 kg / h, laser scanning rate is 85-100 m / min, and overlap rate is 46-66%.

[0023] The application is beneficial to further improve the quality of the refractory high-entropy alloy coating, thereby improving the high-temperature oxidation resistance and wear resistance of the coating by simultaneously controlling the laser power, the laser scanning rate, the powder feeding rate, the spot diameter and the overlap rate within a certain range.

[0024] Preferably, the laser power can be 2800W, 2900W, 3000W, 3100W, 3200W, 3300W, 3400W, 3500W, or any other value within the range of 2800-3500W.

[0025] Preferably, the laser scanning rate can be 85m / min, 90m / min, 95m / min, 100m / min, or any other value within the range of 85-100m / min.

[0026] Preferably, the substrate is subjected to induction preheating before the ultra-high-speed laser cladding, and the preheating is performed at 250-350℃ for 20-40min.

[0027] Preferably, inert gas protection is performed during the ultra-high-speed laser cladding, and the entire cladding process is protected by inert gas through a protection atmosphere box.

[0028] Compared with the prior art, the application has the following beneficial effects:

[0029] (1) The Nb, Mo, Ta, W, V, Cr and Si high-entropy alloy powder prepared by the application has different component proportions and is completely alloyed, and has uniform components, excellent sphericity and flowability, and uniform refractory high-entropy alloy powder particle size distribution, which is very suitable for use in ultra-high-speed laser cladding technology.

[0030] (2) The Nb, Mo, Ta, W, V, Cr and Si refractory high-entropy alloy coating prepared by the ultra-high-speed laser cladding technology has high thermal stability BCC solid solution phase and Laves phase, has high-entropy effect, lattice distortion effect, delayed diffusion effect and cocktail effect, and has excellent high-temperature resistance, high strength, radiation resistance and other excellent properties. The ingenious design of Cr element and refractory metal elements can form Laves phase with high melting point and medium density, further improve the high-temperature strength and creep resistance of the refractory high-entropy alloy, and improve the oxidation resistance and hot corrosion resistance at high temperature.

[0031] (3) The super-high-speed laser cladding technology preparation method of the application has high efficiency, is easy to operate, has low cost, has small thermal influence on the substrate, forms metallurgical bonding with the substrate, and prepares a dense and defect-free refractory high-entropy alloy coating, and the obtained coating can be used for surface protection and remanufacturing of key parts of aerospace, nuclear reactors and the like serving in high-temperature extreme working conditions, and has important economic value and popularization significance. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is an electron microscope image of the refractory high-entropy alloy powder of embodiment 1 of the application.

[0033] Figure 2 is a cross-sectional microstructure structure diagram of the refractory high-entropy alloy coating of embodiment 1 of the application.

[0034] Figure 3 is an X-ray diffraction diagram of the refractory high-entropy alloy coating of embodiment 1 of the application. DETAILED DESCRIPTION

[0035] In order to better illustrate the purpose, technical scheme and advantages of the application, the application will be further described below in combination with specific embodiments, but the protection scope and implementation mode of the application are not limited thereto.

[0036] The materials, reagents and the like used in the following examples are commercially available reagents and materials unless otherwise specified.

[0037] Embodiment 1

[0038] The embodiment discloses a refractory high-entropy alloy powder for super-high-speed laser cladding, which contains 17% of Nb, 17% of Mo, 16% of Ta, 16% of W, 17% of V, 16% of Cr and 1% of Si.

[0039] The refractory high-entropy alloy powder is prepared by a radio frequency plasma spheroidization method, the sphericity of the refractory high-entropy alloy powder is ≥95%, the particle size distribution range is 15-85 μm, the D50 is 50 μm, and the fluidity is 15 s / 50 g.

[0040] The embodiment also discloses a refractory high-entropy alloy coating, which is obtained by depositing the refractory high-entropy alloy powder on the surface of a substrate by a super-high-speed laser cladding method. The thickness of the refractory high-entropy alloy coating is 2 mm, and according to the X-ray diffraction diagram of the refractory high-entropy alloy coating, the refractory high-entropy alloy coating has a BCC phase and a Laves phase.

[0041] The embodiment also discloses a preparation method of the refractory high-entropy alloy coating, and the refractory high-entropy alloy powder is deposited on the surface of the substrate by using the super-speed laser cladding mode. The process parameters of the super-speed laser cladding mode include that the laser power is 3200 W, the spot diameter is 1 mm, the powder feeding rate is 1.8 kg / h, the laser scanning rate is 85 m / min, and the lap rate is 50%.

[0042] The substrate is subjected to induction heating treatment before the super-speed laser cladding, and is preheated at 300 DEG C for 30 min. Inert gas protection is performed during the super-speed laser cladding, and the inert gas protection is performed on the whole cladding process by using a protection atmosphere box.

[0043] Finally, the refractory high-entropy alloy coating sample prepared by the super-speed laser cladding is subjected to forming quality, microhardness, friction and wear, high-temperature corrosion test analysis.

[0044] Embodiment 2

[0045] Different from the embodiment 1, the refractory high-entropy alloy powder contains 16% of Nb, 16% of Mo, 17% of Ta, 17% of W, 16% of V, 17% of Cr and 1% of Si, and the other conditions are the same as those in the embodiment 1.

[0046] Embodiment 3

[0047] Different from the embodiment 1, the refractory high-entropy alloy powder contains 16% of Nb, 16% of Mo, 16% of Ta, 16% of W, 17% of V, 17% of Cr and 2% of Si, and the other conditions are the same as those in the embodiment 1.

[0048] Embodiment 4

[0049] Different from the embodiment 1, the refractory high-entropy alloy powder contains 17% of Nb, 17% of Mo, 16% of Ta, 16% of W, 17% of V, 15.8% of Cr and 1.2% of Si, and the other conditions are the same as those in the embodiment 1.

[0050] Embodiment 5

[0051] Different from the embodiment 1, the refractory high-entropy alloy powder contains 17% of Nb, 17% of Mo, 16% of Ta, 16% of W, 17% of V, 15.2% of Cr and 1.8% of Si, and the other conditions are the same as those in the embodiment 1.

[0052] Embodiment 6

[0053] The embodiment discloses a refractory high-entropy alloy powder for super-speed laser cladding, which contains 15% of Nb, 15% of Mo, 18% of Ta, 18% of W, 15% of V, 18% of Cr and 1% of Si.

[0054] The refractory high-entropy alloy powder is prepared by a radio frequency plasma spheroidization method, the refractory high-entropy alloy powder has a sphericity of ≥95%, a particle size distribution range of 15-85 μm, a D50 of 35 μm, and a fluidity of 20 s / 50 g.

[0055] The refractory high-entropy alloy coating has a thickness of 0.5 mm, and has a BCC phase and a Laves phase.

[0056] The refractory high-entropy alloy coating has a thickness of 0.5 mm, and has a BCC phase and a Laves phase.

[0057] The refractory high-entropy alloy coating has a thickness of 0.5 mm, and has a BCC phase and a Laves phase.

[0058] Example 7

[0059] The refractory high-entropy alloy powder for the super-high-speed laser cladding contains 18% of Nb, 18% of Mo, 15% of Ta, 15% of W, 18% of V, 15% of Cr, and 1% of Si.

[0060] The refractory high-entropy alloy powder is prepared by a radio frequency plasma spheroidization method, the refractory high-entropy alloy powder has a sphericity of ≥95%, a particle size distribution range of 15-85 μm, a D50 of 35 μm, and a fluidity of 20 s / 50 g.

[0061] The refractory high-entropy alloy coating has a thickness of 0.5 mm, and has a BCC phase and a Laves phase.

[0062] The refractory high-entropy alloy coating has a thickness of 0.5 mm, and has a BCC phase and a Laves phase.

[0063] The substrate is subjected to induction heating treatment before the ultra-high-speed laser cladding, and is preheated at 350℃ for 40 minutes; inert gas protection is performed during the ultra-high-speed laser cladding, and the entire cladding process is protected by an inert gas atmosphere box.

[0064] Example 8

[0065] Different from example 1 is that the D50 of the refractory high-entropy alloy powder is 40 μm, and the others are the same as example 1.

[0066] Example 9

[0067] Different from example 1 is that the thickness of the refractory high-entropy alloy coating is 1 mm, and the others are the same as example 1.

[0068] Example 10

[0069] Different from example 1 is that the laser power of the ultra-high-speed laser cladding is 3500 W, and the others are the same as example 1.

[0070] Comparative example 1

[0071] Different from example 1 is that the refractory high-entropy alloy powder contains 15% of Nb, 15% of Mo, 15% of Ta, 24% of W, 15% of V, 15% of Cr and 1% of Si, and the others are the same as example 1.

[0072] Comparative example 2

[0073] Different from example 1 is that the refractory high-entropy alloy powder contains 20% of Nb, 20% of Mo, 19% of Ta, 20% of W, 20% of V, 0% of Cr and 1% of Si, and the others are the same as example 1.

[0074] Comparative example 3

[0075] Different from example 1 is that the refractory high-entropy alloy powder contains 17% of Nb, 17% of Mo, 16% of Ta, 16% of W, 17% of V, 17% of Cr and 0% of Si, and the others are the same as example 1.

[0076] Comparative example 4

[0077] Different from example 1 is that the sphericity of the refractory high-entropy alloy powder is 60%, and the others are the same as example 1.

[0078] Comparative example 5

[0079] Different from example 1 is that the D50 of the refractory high-entropy alloy powder is 15 μm, and the others are the same as example 1.

[0080] Comparative Example 6

[0081] The difference from Example 1 is that the refractory high-entropy alloy powder D50 is 100 μm, and the others are the same as Example 1.

[0082] Comparative Example 7

[0083] The difference from Example 1 is that the thickness of the refractory high-entropy alloy coating is 5 mm, and the others are the same as Example 1.

[0084] Comparative Example 8

[0085] The difference from Example 1 is that the thickness of the refractory high-entropy alloy coating is 0.2 mm, and the others are the same as Example 1.

[0086] Comparative Example 9

[0087] The difference from Example 1 is that the laser power of the ultra-high-speed laser cladding is 2000 W, and the others are the same as Example 1.

[0088] Comparative Example 10

[0089] The difference from Example 1 is that the laser power of the ultra-high-speed laser cladding is 4000 W, and the others are the same as Example 1.

[0090] Comparative Example 11

[0091] The difference from Example 1 is that the scanning speed of the ultra-high-speed laser cladding is 20 m / s, and the others are the same as Example 1.

[0092] Comparative Example 12

[0093] The difference from Example 1 is that the scanning speed of the ultra-high-speed laser cladding is 120 m / s, and the others are the same as Example 1.

[0094] Comparative Example 13

[0095] The difference from Example 1 is that the substrate is not subjected to induction heating treatment before ultra-high-speed laser cladding, and the others are the same as Example 1.

[0096] Comparative Example 14

[0097] The difference from Example 1 is that the atmosphere is not protected during the process of ultra-high-speed laser cladding, and the others are the same as Example 1.

[0098] Experiment

[0099] Test method of coating forming quality: determined according to national standard “GB / T 36591-2018”

[0100] Test method of abrasion weight loss: determined according to national standard GB / T 12444-2006

[0101] Test method of high temperature oxidation weight gain: determined according to national standard HB 5258-2000

[0102] Test method of microhardness: determined according to national standard GB / T 4342-1991

[0103] Table 1

[0104]

[0105]

[0106] According to the comparison between Comparative Example 1 and Example 1 in Table 1, the content of W in Comparative Example 1 is not within the range of 15-18%, the coating forming quality in Comparative Example 1 is poor, the defects are many, the abrasion weight loss is also higher than that of Example 1, and the high temperature oxidation weight gain content is also higher than that of Example 1, which indicates that the content of elements in the refractory high-entropy alloy powder will affect the performance of the coating.

[0107] According to the comparison between Comparative Examples 2-3 and Example 1 in Table 1, the refractory high-entropy alloy powder in Comparative Example 2 does not contain Cr, the abrasion weight loss of the coating is higher than that of Example 1, and the high temperature oxidation weight gain content is also higher than that of Example 1. The refractory high-entropy alloy powder in Comparative Example 3 does not contain Si, and the wear resistance and high temperature oxidation resistance are all not as good as those of Example 1, which indicates that there is a synergistic effect between Nb, Mo, Ta, W, V, Cr and Si in the refractory high-entropy alloy powder, and the absence of Cr or Si cannot achieve the effect of the present application.

[0108] According to the comparison between Comparative Example 4 and Example 1 in Table 1, the sphericity of the refractory high-entropy alloy powder in Comparative Example 4 is 60%, the coating forming quality is poor, the defects are many, and the wear resistance and high temperature oxidation resistance of the coating are all not as good as those of Example 1, which indicates that the sphericity of the refractory high-entropy alloy powder less than 95% cannot achieve the effect of the present application. In the present application, only when the sphericity of the refractory high-entropy alloy powder is greater than 95% can the coating have excellent high temperature oxidation resistance and wear resistance.

[0109] According to the comparison between Comparative Examples 5-6 and Example 1 in Table 1, the D50 of the refractory high-entropy alloy powder in Comparative Examples 5 and 6 are not within the range protected by the present application, the coating forming quality in Comparative Examples 5 and 6 is poor, the defects are many, and the wear resistance and high temperature oxidation resistance of the coating are all not as good as those of Example 1, which indicates that the refractory high-entropy alloy powder cannot achieve the effect of the present application with any D50, and only when the D50 of the refractory high-entropy alloy powder is within the range of 35-65 μm can the coating have excellent high temperature oxidation resistance and wear resistance.

[0110] According to Table 1, the thicknesses of the refractory high-entropy alloy coatings in Comparative Examples 7-8 are not within the range defined in the present application, the forming quality of the coatings is poor, there are many defects, and the wear resistance and high-temperature oxidation resistance of the coatings are not as good as in Example 1, indicating that the thickness of the refractory high-entropy alloy coating must be within the range defined in the present application to enable the coating to have excellent high-temperature oxidation resistance and wear resistance.

[0111] According to Table 1, the laser power in the ultra-high-speed laser cladding in Comparative Example 9 is less than 2800 W, and the performance of the coating is not as good as in Example 1. Too low laser power can easily result in insufficient input energy and incomplete melting of the powder. The laser power in the ultra-high-speed laser cladding in Comparative Example 10 is greater than 3500 W, and the performance of the coating is not as good as in Example 1. Too high laser power can easily result in high input energy and burning of elements, thus forming defects. It can be seen that the laser power in the ultra-high-speed laser cladding has a great influence on the performance of the coating. In the present application, the laser power in the ultra-high-speed laser cladding must be within the range of 2800-3500 W to enable the coating to have excellent high-temperature oxidation resistance, high hardness, and wear resistance.

[0112] According to Table 1, the scanning speeds in the ultra-high-speed laser cladding in Comparative Examples 11-12 are not within the range protected in the present application, the forming quality of the coatings is poor, there are many defects, and the performance of the coatings is not as good as in Example 1, indicating that the scanning speed in the ultra-high-speed laser cladding has an influence on the performance of the coating. In the present application, the scanning speed in the ultra-high-speed laser cladding must be within the range of 85-100 m / min to enable the coating to have excellent high-temperature oxidation resistance and wear resistance.

[0113] According to Table 1, the substrate in Comparative Example 13 is not subjected to induction heating treatment, and the process of the ultra-high-speed laser cladding in Comparative Example 14 is not protected by an inert gas atmosphere. The forming quality of the coatings is poor, there are many defects, and the wear resistance of the coatings is not as good as in Example 1, indicating that induction heating treatment of the substrate before the ultra-high-speed laser cladding and protection by an inert gas atmosphere during the process of the ultra-high-speed laser cladding can improve the wear resistance of the coating.

[0114] According to Table 1, the refractory high-entropy alloy coating of the present application has excellent high-temperature oxidation resistance, high hardness, and wear resistance.

[0115] Finally, it should be noted that the above examples are merely intended to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A refractory high-entropy alloy coating, characterized in that, The refractory high-entropy alloy powder is deposited on the surface of a substrate by super-high-speed laser cladding; The refractory high-entropy alloy powder contains the following elements in terms of atomic percentage: 17% Nb, 17% Mo, 16% Ta, 16% W, 17% V, 16% Cr, and 1% Si; The refractory high-entropy alloy powder has a sphericity of 95-100%. The refractory high-entropy alloy powder has a particle size distribution range of 15-85 μm, a D50 of 35-65 μm, and a flowability of 15-20 s / 50 g. The laser power during the super-high-speed laser cladding is 2900-3500 W, and the laser scanning rate is 85-100 m / min.

2. The refractory high-entropy alloy coating of claim 1, wherein, The refractory high-entropy alloy coating has a thickness of 0.5-2 mm.

3. A method of producing a refractory high-entropy alloy coating as claimed in any one of claims 1-2, characterized in that, The refractory high-entropy alloy powder is deposited on the surface of a substrate by super-high-speed laser cladding.

4. The method of claim 3, wherein the refractory high-entropy alloy coating is prepared by a process comprising: The process parameters of the super-high-speed laser cladding include a spot diameter of 0.8-1.2 mm, a powder feeding rate of 1.5-2.0 kg / h, and an overlapping rate of 46-66%.

5. The method of claim 3, wherein the refractory high-entropy alloy coating is prepared by a process comprising: The super-high-speed laser cladding further comprises the following step before the super-high-speed laser cladding: performing induction preheating treatment on the substrate, and preheating at 250-350 °C for 20-40 min.

6. The method of claim 3, wherein the refractory high-entropy alloy coating is prepared by a process comprising: Inert gas protection is performed during the super-high-speed laser cladding.

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