Molybdenum alloy surface multi-element anti-oxidation coating and preparation method thereof

Abstract

The invention belongs to the technical field of metal coatings, and particularly relates to a molybdenum alloy surface multi-element anti-oxidation coating and a preparation method thereof.A laser cladding method is adopted for preparing a multi-element Si-ZrB2-Ti-Cr coating, oxygen can be prevented from diffusing and entering through cracks in the coating, a SiO2 + ZrO2 oxidation layer can be formed on the coating under the high-temperature condition, and the oxidation resistance of the coating is improved; and the high-temperature oxidation resistance of the molybdenum alloy is remarkably improved, and the molybdenum alloy can be applied to surface protection of the molybdenum alloy in a high-temperature service environment.

Description

Technical Field

[0001] The invention belongs to the technical field of metal coating preparation, and specifically relates to a multi-element anti-oxidation coating on the surface of a molybdenum alloy and a preparation method thereof. Background Art

[0002] Molybdenum-based alloys have high melting points, low thermal expansion coefficients, high strength and excellent corrosion resistance, and have become high-temperature structural materials with great potential in the aerospace and nuclear fields. However, molybdenum-based alloys are very susceptible to rapid oxidation above 600°C, causing molybdenum alloys to lose their excellent high-temperature properties and cause structural failure, thus limiting the wider application of molybdenum alloys. Therefore, improving the oxidation resistance of molybdenum alloys is the key to ensuring their long-term safe service, and it is urgent to develop high-temperature oxidation-resistant coating materials that can be used under ultra-high temperature conditions.

[0003] Current research shows that MoSi2 coatings are widely used in the design of anti-oxidation on the surface of molybdenum alloys because they can react with O2 at high temperatures to generate a chemically stable SiO2 glass phase. Their low oxygen diffusion rate can prevent O2 from diffusing into the coating to reduce the erosion rate of oxygen on the coating. However, the thermal expansion coefficients of MoSi2 coatings and molybdenum alloy substrates are quite different, which makes the surface coating prone to cracking, seriously affecting the anti-oxidation performance of the coating. At present, it is difficult to achieve crack optimization modification of MoSi2 coatings by modifying a single alloy element. Therefore, a design of a multi-element anti-oxidation coating on the surface of molybdenum alloys is proposed to achieve better bonding and higher anti-oxidation performance of the coating. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the main purpose of the present invention is to provide a multi-component anti-oxidation coating on the surface of a molybdenum alloy and a preparation method thereof, and to prepare the multi-component anti-oxidation coating on the surface of a molybdenum alloy by a laser cladding method.

[0005] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0006] A method for preparing a multi-element anti-oxidation coating on a molybdenum alloy surface comprises the following steps:

[0007] S1. Use a planetary ball mill to mix Si powder, ZrB2 powder, Ti powder and Cr powder and then dry them;

[0008] S2. Prepare Si-ZrB2-Ti-Cr multi-component antioxidant coating on the surface of molybdenum alloy by laser cladding method: The Si-ZrB2-Ti-Cr mixed powder is transported to the focal area of ​​the laser beam through a powder feeder. Under the protection of inert gas, the laser beam is used to quickly melt the powder and the thin layer on the surface of the molybdenum substrate. The mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. Subsequently, it is heat-insulated in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-component antioxidant coating on the surface of the molybdenum alloy.

[0009] As a preferred embodiment of the method for preparing a multi-element anti-oxidation coating on the surface of a molybdenum alloy according to the present invention, the method further comprises: before step S1,

[0010] S0. The molybdenum alloy substrate is polished, cleaned, and then dried for standby use.

[0011] As a preferred embodiment of the method for preparing a multi-element anti-oxidation coating on the surface of a molybdenum alloy described in the present invention, in the step S0, the surface of the molybdenum alloy is coarsely ground with 70-2000# sandpaper, then rinsed with clean water, and then ultrasonically cleaned with alkaline solution, pickling solution and anhydrous ethanol in sequence, and finally dried for standby use.

[0012] As a preferred embodiment of the method for preparing a multi-component anti-oxidation coating on the surface of a molybdenum alloy described in the present invention, wherein: in the step S1, the ball-to-material ratio of ball milling is (5-20):1, the rotation speed is 100-300r / min, and the particle size of Si powder, ZrB2 powder, Ti powder and Cr powder after ball milling is 10-40μm.

[0013] As a preferred embodiment of the method for preparing a multi-element anti-oxidation coating on the surface of a molybdenum alloy described in the present invention, wherein: in the step S1, the mixing time of ball milling is 24 to 48 hours, wherein the forward and reverse rotation times each account for half.

[0014] As a preferred embodiment of the method for preparing a multi-element anti-oxidation coating on the surface of a molybdenum alloy described in the present invention, in step S1, the mass ratio of Si powder, ZrB2 powder, Ti powder and Cr powder is (10-40):(5-35):(5-35):(20-50).

[0015] As a preferred embodiment of the method for preparing a multi-component anti-oxidation coating on the surface of a molybdenum alloy described in the present invention, wherein: in the step S1, Si powder, ZrB2 powder, Ti powder, and Cr powder are taken in the same planetary ball mill according to the mass ratio and ball-milled to obtain a Si-ZrB2-Ti-Cr mixed powder; or Si powder, ZrB2 powder, Ti powder, and Cr powder are respectively ball-milled in a planetary ball mill, and then Si powder, ZrB2 powder, Ti powder, and Cr powder are mixed in the mass ratio and ball-milled in a planetary ball mill to obtain a Si-ZrB2-Ti-Cr mixed powder.

[0016] As a preferred embodiment of the method for preparing a multi-element anti-oxidation coating on the surface of a molybdenum alloy described in the present invention, in step S2, the laser power is 1-3 kW, the cladding speed is 450-800 mm / s, and argon gas is used for protection. The sequence of first spreading powder and then cladding is adopted, so that the laser beam is focused on the powder, instantly heating and melting the powder to form a coating.

[0017] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0018] A multi-component anti-oxidation coating on the surface of a molybdenum alloy is prepared by adopting the preparation method of the multi-component anti-oxidation coating on the surface of a molybdenum alloy.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention proposes a multi-component anti-oxidation coating on the surface of a molybdenum alloy and a preparation method thereof. The multi-component Si-ZrB2-Ti-Cr coating is prepared by a laser cladding method, which can prevent oxygen from diffusing into the coating through cracks in the coating. The coating can form a SiO2+ZrO2 oxide layer under high temperature conditions, which significantly improves the high-temperature oxidation resistance of the molybdenum alloy and can be used for surface protection of molybdenum alloys under high-temperature service environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 Surface and cross-sectional SEM images of the coating prepared in Example 2 of the present invention.

[0023] Figure 2 Surface and cross-sectional SEM images of the coating prepared in Example 4 of the present invention.

[0024] Figure 3Surface and cross-sectional SEM images of the coating prepared in Comparative Example 1 of the present invention.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The main purpose of the present invention is to provide a multi-component anti-oxidation coating on the surface of a molybdenum alloy and a preparation method thereof. The multi-component anti-oxidation coating is prepared on the surface of a molybdenum alloy by a laser cladding method, and exhibits excellent anti-oxidation performance.

[0028] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0029] Example 1

[0030] A method for preparing a multi-element alloy anti-oxidation coating by laser cladding on a molybdenum alloy surface comprises the following steps:

[0031] S0. Use 70-2000# sandpaper to grind the molybdenum alloy substrate, then rinse with clean water, then use alkaline solution, pickling solution and anhydrous ethanol for ultrasonic cleaning in sequence, and finally blow dry for standby use;

[0032] S1. Use a planetary ball mill to ball-mill Si powder, ZrB2 powder, Ti powder and Cr powder, and then dry them for use, and the particle size is 10-40μm; mix the treated Si powder, ZrB2 powder, Ti powder and Cr powder in a certain proportion, wherein: the content of Si powder is 40wt%, the content of ZrB2 powder is 5wt%, the content of Ti powder is 35wt%, and the content of Cr powder is 20wt%; use a planetary ball mill for mixed grinding, the ball-to-material ratio of the ball mill is 5:1, the rotation speed is 100r / min, the mixing time of the ball mill is 24h, wherein the forward and reverse rotations are 12h each; prepare a uniform Si-ZrB2-Ti-Cr mixed powder for use.

[0033] S2. The Si-ZrB2-Ti-Cr multi-element alloy coating is prepared on the surface of the molybdenum alloy by laser cladding. First, the mixed Si-ZrB2-Ti-Cr mixed powder is transported to the focal area of ​​the laser beam through a powder feeder. The laser power is 1 kW, the cladding speed is 450 mm / s, and argon gas is used for protection. The order of first spreading the powder and then cladding is adopted to focus the laser beam on the powder, instantly heat and melt the powder, and use the laser beam to quickly melt the powder and the thin layer on the surface of the molybdenum substrate. The mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. Subsequently, it is heat-insulated in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-element antioxidant coating on the surface of the molybdenum alloy.

[0034] Example 2

[0035] A method for preparing a multi-element alloy anti-oxidation coating by laser cladding on a molybdenum alloy surface comprises the following steps:

[0036] S0. Use 70-2000# sandpaper to grind the molybdenum alloy substrate, then rinse with clean water, then use alkaline solution, pickling solution and anhydrous ethanol for ultrasonic cleaning in sequence, and finally blow dry for standby use;

[0037] S1. Use a planetary ball mill to ball-mill Si powder, ZrB2 powder, Ti powder and Cr powder, and then dry them for use, and the particle size is 10-40μm; mix the treated Si powder, ZrB2 powder, Ti powder and Cr powder in a certain proportion, wherein: the content of Si powder is 35wt%, the content of ZrB2 powder is 10wt%, the content of Ti powder is 30wt%, and the content of Cr powder is 25wt%; use a planetary ball mill for mixed grinding, the ball-to-material ratio of the ball mill is 5:1, the rotation speed is 100r / min, the mixing time of the ball mill is 24h, wherein the forward and reverse rotations are 12h each; prepare a uniform Si-ZrB2-Ti-Cr mixed powder for use.

[0038] S2. The Si-ZrB2-Ti-Cr multi-element alloy coating is prepared on the surface of the molybdenum alloy by laser cladding. First, the mixed Si-ZrB2-Ti-Cr mixed powder is transported to the focal area of ​​the laser beam through a powder feeder. The laser power is 1 kW, the cladding speed is 500 mm / s, and argon gas is used for protection. The order of first spreading the powder and then cladding is adopted to focus the laser beam on the powder, instantly heat and melt the powder, and use the laser beam to quickly melt the powder and the thin layer on the surface of the molybdenum substrate. The mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. Subsequently, it is heat-insulated in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-element antioxidant coating on the surface of the molybdenum alloy.

[0039] The surface and cross-sectional SEM images of the multi-alloy anti-oxidation coating on the molybdenum alloy surface prepared in this embodiment are as follows: Figure 1 As shown (the left side is the surface SEM image, and the right side is the cross-sectional SEM image), it can be seen that the coating surface is relatively smooth and no obvious cracks are found in the cross section; the coating has a good bonding effect with the substrate, and the interior of the coating is dense and uniform.

[0040] Example 3

[0041] A method for preparing a multi-element alloy anti-oxidation coating by laser cladding on a molybdenum alloy surface comprises the following steps:

[0042] S0. Use 70-2000# sandpaper to grind the molybdenum alloy substrate, then rinse with clean water, then use alkaline solution, pickling solution and anhydrous ethanol for ultrasonic cleaning in sequence, and finally blow dry for standby use;

[0043] S1. Use a planetary ball mill to ball-mill Si powder, ZrB2 powder, Ti powder and Cr powder, and then dry them for use, and the particle size is 10-40μm; mix the treated Si powder, ZrB2 powder, Ti powder and Cr powder in a certain proportion, wherein: the content of Si powder is 30wt%, the content of ZrB2 powder is 15wt%, the content of Ti powder is 25wt%, and the content of Cr powder is 30wt%; use a planetary ball mill for mixed grinding, the ball-to-material ratio of the ball mill is 10:1, the rotation speed is 150r / min, the mixing time of the ball mill is 36h, wherein the forward and reverse rotations are 18h each; prepare uniform Si-ZrB2-Ti-Cr mixed powder for use.

[0044] S2. The Si-ZrB2-Ti-Cr multi-element alloy coating is prepared on the surface of the molybdenum alloy by laser cladding. First, the mixed Si-ZrB2-Ti-Cr mixed powder is transported to the focal area of ​​the laser beam through a powder feeder. The laser power is 1.5 kW, the cladding speed is 550 mm / s, and argon gas is used for protection. The order of first spreading the powder and then cladding is adopted to focus the laser beam on the powder, instantly heat and melt the powder, and use the laser beam to quickly melt the powder and the thin layer on the surface of the molybdenum substrate. The mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. Subsequently, it is heat-insulated in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-element antioxidant coating on the surface of the molybdenum alloy.

[0045] Example 4

[0046] A method for preparing a multi-element alloy anti-oxidation coating by laser cladding on a molybdenum alloy surface comprises the following steps:

[0047] S0. Use 70-2000# sandpaper to grind the molybdenum alloy substrate, then rinse with clean water, then use alkaline solution, pickling solution and anhydrous ethanol for ultrasonic cleaning in sequence, and finally blow dry for standby use;

[0048] S1. Use a planetary ball mill to ball-mill Si powder, ZrB2 powder, Ti powder and Cr powder, and then dry them for use, and the particle size is 10-40μm; mix the treated Si powder, ZrB2 powder, Ti powder and Cr powder in a certain proportion, wherein: the content of Si powder is 25wt%, the content of ZrB2 powder is 20wt%, the content of Ti powder is 20wt%, and the content of Cr powder is 35wt%; use a planetary ball mill for mixed grinding, the ball-to-material ratio of the ball mill is 10:1, the rotation speed is 150r / min, the mixing time of the ball mill is 36h, wherein the forward and reverse rotations are 18h each; prepare a uniform Si-ZrB2-Ti-Cr mixed powder for use.

[0049] S2. The Si-ZrB2-Ti-Cr multi-element alloy coating is prepared on the surface of the molybdenum alloy by laser cladding. First, the mixed Si-ZrB2-Ti-Cr mixed powder is transported to the focal area of ​​the laser beam through a powder feeder. The laser power is 1.5 kW, the cladding speed is 600 mm / s, and argon gas is used for protection. The sequence of first spreading the powder and then cladding is adopted to focus the laser beam on the powder, instantly heat and melt the powder, and use the laser beam to quickly melt the powder and the thin layer on the surface of the molybdenum substrate. The mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. Subsequently, the coating is heat-insulated in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-element antioxidant coating on the surface of the molybdenum alloy.

[0050] The surface and cross-sectional SEM images of the multi-alloy anti-oxidation coating on the molybdenum alloy surface prepared in this embodiment are as follows: Figure 2 As shown (the left side is the surface SEM image, and the right side is the cross-sectional SEM image), it can be seen that the coating surface is relatively smooth and no micro cracks are found in the cross section; the coating has a good bonding effect with the substrate, and the interior of the coating is dense and uniform.

[0051] Example 5

[0052] A method for preparing a multi-element alloy anti-oxidation coating by laser cladding on a molybdenum alloy surface comprises the following steps:

[0053] S0. Use 70-2000# sandpaper to grind the molybdenum alloy substrate, then rinse with clean water, then use alkaline solution, pickling solution and anhydrous ethanol for ultrasonic cleaning in sequence, and finally blow dry for standby use;

[0054] S1. Use a planetary ball mill to ball-mill Si powder, ZrB2 powder, Ti powder and Cr powder, and then dry them for use, and the particle size is 10-40μm; mix the treated Si powder, ZrB2 powder, Ti powder and Cr powder in a certain proportion, wherein: the content of Si powder is 20wt%, the content of ZrB2 powder is 25wt%, the content of Ti powder is 15wt%, and the content of Cr powder is 40wt%; use a planetary ball mill for mixed grinding, the ball-to-material ratio of the ball mill is 15:1, the rotation speed is 200r / min, the mixing time of the ball mill is 48h, wherein the forward and reverse rotations are 24h each; prepare a uniform Si-ZrB2-Ti-Cr mixed powder for use.

[0055] S2. The Si-ZrB2-Ti-Cr multi-element alloy coating is prepared on the surface of the molybdenum alloy by laser cladding. First, the mixed Si-ZrB2-Ti-Cr mixed powder is transported to the focal area of ​​the laser beam through a powder feeder. The laser power is 2 kW, the cladding speed is 650 mm / s, and argon gas is used for protection. The order of first spreading the powder and then cladding is adopted to focus the laser beam on the powder, instantly heat and melt the powder, and use the laser beam to quickly melt the powder and the thin layer on the surface of the molybdenum substrate. The mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. Subsequently, the coating is heat-insulated in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-element antioxidant coating on the surface of the molybdenum alloy.

[0056] Example 6

[0057] A method for preparing a multi-element alloy anti-oxidation coating by laser cladding on a molybdenum alloy surface comprises the following steps:

[0058] S0. Use 70-2000# sandpaper to grind the molybdenum alloy substrate, then rinse with clean water, then use alkaline solution, pickling solution and anhydrous ethanol for ultrasonic cleaning in sequence, and finally blow dry for standby use;

[0059] S1. Use a planetary ball mill to ball-mill Si powder, ZrB2 powder, Ti powder and Cr powder, and then dry them for use, and the particle size is 10-40μm; mix the treated Si powder, ZrB2 powder, Ti powder and Cr powder in a certain proportion, wherein: the content of Si powder is 15wt%, the content of ZrB2 powder is 30wt%, the content of Ti powder is 10wt%, and the content of Cr powder is 45wt%; use a planetary ball mill for mixed grinding, the ball-to-material ratio of the ball mill is 15:1, the rotation speed is 200r / min, the mixing time of the ball mill is 48h, wherein the forward and reverse rotations are 24h each; prepare a uniform Si-ZrB2-Ti-Cr mixed powder for use.

[0060] S2. The Si-ZrB2-Ti-Cr multi-element alloy coating is prepared on the surface of the molybdenum alloy by laser cladding. First, the mixed Si-ZrB2-Ti-Cr mixed powder is transported to the focal area of ​​the laser beam through a powder feeder. The laser power is 2 kW, the cladding speed is 700 mm / s, and argon gas is used for protection. The sequence of first spreading the powder and then cladding is adopted to focus the laser beam on the powder, instantly heat and melt the powder, and use the laser beam to quickly melt the powder and the thin layer on the surface of the molybdenum substrate. The mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. Subsequently, the coating is heat-insulated in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-element antioxidant coating on the surface of the molybdenum alloy.

[0061] Example 7

[0062] A method for preparing a multi-element alloy anti-oxidation coating by laser cladding on a molybdenum alloy surface comprises the following steps:

[0063] S0. Use 70-2000# sandpaper to grind the molybdenum alloy substrate, then rinse with clean water, then use alkaline solution, pickling solution and anhydrous ethanol for ultrasonic cleaning in sequence, and finally blow dry for standby use;

[0064] S1. Use a planetary ball mill to ball-mill Si powder, ZrB2 powder, Ti powder and Cr powder, and then dry them for use, and the particle size is 10-40μm; mix the treated Si powder, ZrB2 powder, Ti powder and Cr powder in a certain proportion, wherein: the content of Si powder is 10wt%, the content of ZrB2 powder is 35wt%, the content of Ti powder is 5wt%, and the content of Cr powder is 50wt%; use a planetary ball mill for mixed grinding, the ball-to-material ratio of the ball mill is 20:1, the rotation speed is 300r / min, the mixing time of the ball mill is 48h, wherein the forward and reverse rotations are 24h each; prepare a uniform Si-ZrB2-Ti-Cr mixed powder for use.

[0065] S2. The Si-ZrB2-Ti-Cr multi-element alloy coating is prepared on the surface of the molybdenum alloy by laser cladding. First, the mixed Si-ZrB2-Ti-Cr mixed powder is transported to the focal area of ​​the laser beam through a powder feeder. The laser power is 3 kW, the cladding speed is 750 mm / s, and argon gas is used for protection. The order of first spreading the powder and then cladding is adopted to focus the laser beam on the powder, instantly heat and melt the powder, and use the laser beam to quickly melt the powder and the thin layer on the surface of the molybdenum substrate. The mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. Subsequently, the coating is heat-insulated in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-element antioxidant coating on the surface of the molybdenum alloy.

[0066] Comparative Example 1

[0067] The difference from Example 1 is that the content of ZrB2 powder is 0wt% and the content of Ti powder is 40wt%.

[0068] The surface and cross-sectional SEM images of the coating on the molybdenum alloy surface prepared in this comparative example are as follows: Figure 3 As shown (the left side is the surface SEM image, and the right side is the cross-sectional SEM image), the single Si-Ti-Cr coating has obvious cracks on the surface and the surface is relatively rough; the coating is well bonded to the substrate, and the interior of the coating is dense and uneven.

[0069] The molybdenum alloys with coatings on the surfaces prepared in the above embodiments and comparative examples were subjected to a static oxidation resistance test in air at 1000°C with a holding time of 10 to 20 hours. The integrity of the coating after oxidation and the presence of cracks were used as a basis for judging the oxidation resistance life. The results are shown in the following table. It can be seen that the oxidation resistance life of the oxidation resistance coatings on the surfaces of the molybdenum alloys in each embodiment of the present invention is ≥15 hours.

[0070]

[0071]

[0072] It can be seen from the above embodiments and comparative examples that the present invention prepares a Si-ZrB2-Ti-Cr multi-element alloy coating on the surface of a molybdenum alloy, and the added Si and Ti will form a relatively continuous SiO2 and TiO2 protective film, which can greatly reduce the oxygen permeability and improve the oxidation resistance of the coating. This composite coating significantly improves the resistance of the molybdenum alloy to high-temperature oxidation.

[0073] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing a multi-element anti-oxidation coating on a molybdenum alloy surface, characterized in that: The steps include: S1, ball milling Si powder, ZrB2 powder, Ti powder and Cr powder and drying them; S2. Prepare Si-ZrB2-Ti-Cr multi-component antioxidant coating on the surface of molybdenum alloy by laser cladding method: transport Si-ZrB2-Ti-Cr mixed powder to the focal area of ​​the laser beam, and under the protection of inert gas, use the laser beam to quickly melt the powder and the thin layer on the surface of the molybdenum substrate, and the mixed powder is metallurgically bonded with the molybdenum substrate to form an alloy coating with excellent antioxidant properties. It is then subjected to insulation treatment in a vacuum furnace and slowly cooled to room temperature with the furnace to obtain a multi-component antioxidant coating on the surface of the molybdenum alloy.

2. The method for preparing the multi-component anti-oxidation coating on the surface of a molybdenum alloy according to claim 1, characterized in that: Before step S1, the step also includes: S0. The molybdenum alloy substrate is polished, cleaned, and then dried for standby use.

3. The method for preparing the multi-component anti-oxidation coating on the surface of a molybdenum alloy according to claim 2, characterized in that: In the step S0, the surface of the molybdenum alloy is roughly ground with 70-2000# sandpaper, then rinsed with clean water, and then ultrasonically cleaned with alkaline solution, pickling solution and anhydrous ethanol in sequence, and finally dried for standby use.

4. The method for preparing the multi-component anti-oxidation coating on the surface of a molybdenum alloy according to claim 1, characterized in that: In the step S1, the ball-to-material ratio of the ball mill is (5-20):1, the rotation speed is 100-300 r / min, and the particle size of the Si powder, ZrB2 powder, Ti powder, and Cr powder after ball milling is 10-40 μm.

5. The method for preparing the multi-element anti-oxidation coating on the surface of a molybdenum alloy according to claim 1, characterized in that: In step S1, the mixing time of ball milling is 24 to 48 hours, wherein the forward and reverse times account for half each.

6. The method for preparing the multi-component anti-oxidation coating on the surface of a molybdenum alloy according to claim 1, characterized in that: In the step S1, the mass ratio of Si powder, ZrB2 powder, Ti powder and Cr powder is (10-40):(5-35):(5-35):(20-50).

7. The method for preparing the multi-component anti-oxidation coating on the surface of a molybdenum alloy according to claim 6, characterized in that: In the step S1, Si powder, ZrB2 powder, Ti powder, and Cr powder are taken in the same planetary ball mill according to the mass ratio and ball-milled to obtain Si-ZrB2-Ti-Cr mixed powder; or Si powder, ZrB2 powder, Ti powder, and Cr powder are respectively ball-milled in a planetary ball mill, and then Si powder, ZrB2 powder, Ti powder, and Cr powder are mixed in the mass ratio and ball-milled in a planetary ball mill to obtain Si-ZrB2-Ti-Cr mixed powder.

8. The method for preparing the multi-element anti-oxidation coating on the surface of a molybdenum alloy according to claim 1, characterized in that: In the step S2, the laser power is 1-3 kW, the cladding speed is 450-800 mm / s, and argon gas is used for protection.

9. A multi-element anti-oxidation coating on the surface of a molybdenum alloy, characterized in that: The multi-component anti-oxidation coating on the surface of a molybdenum alloy is prepared by the method for preparing the multi-component anti-oxidation coating on the surface of a molybdenum alloy according to any one of claims 1 to 8.

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