Nickel-based alloy composite plate and preparation method thereof

Abstract

The present invention relates to a nickel-based alloy composite plate and a preparation method thereof, and belongs to the technical field of alloy preparation. An alloy reinforcing agent is prepared by mixing lanthanum elements and nano-alumina and sintering under high-temperature reducing gas protection. The addition of the alloy reinforcing agent can refine the particle size during the smelting process, and effectively improves the wear resistance, hardness, strength and oxidation resistance of the alloy. Nickel is used as a matrix, and alloy reinforcing agents and elements such as molybdenum, copper, boron and hafnium are added. At the same time, a mixture of potassium chloride and magnesium fluoride is used as a flux to promote uniform mixing and reaction of alloy components. The nickel-based alloy smelted by step-by-step heating in a vacuum has high hardness and strength, good wear resistance, corrosion resistance and high temperature resistance, and the stainless steel substrate and the nickel-based alloy plate are tightly combined by welding. The nickel-based alloy composite plate is suitable for manufacturing a vacuum chamber.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy preparation and relates to a nickel-based alloy composite plate and a preparation method thereof. Background Art

[0002] Nickel is an indispensable metal material in the process of industrial development. With nickel as the matrix and adding suitable elements, its mechanical and chemical properties will be further improved. Therefore, nickel-based alloys are widely used in modern industrial fields such as aerospace, petrochemicals, integrated circuits and marine engineering. However, with the development of science and technology and the progress of industry, the requirements for the strength, high temperature resistance, corrosion resistance and good processing performance of nickel-based alloys are getting higher and higher. Although traditional nickel-based alloys have certain performance advantages, they are still difficult to meet the needs in extreme environments. Therefore, it is urgent to develop higher performance nickel-based alloy composite materials. Summary of the invention

[0003] The object of the present invention is to provide a nickel-based alloy composite plate and a preparation method thereof, which has the characteristics of high strength and corrosion resistance.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A nickel-based alloy composite plate, comprising a 304 stainless steel bottom plate and a nickel-based alloy plate, wherein the nickel-based alloy plate has the following formula, in parts by weight, 35-45 parts of nickel powder, 10-15 parts of molybdenum powder, 5-10 parts of copper powder, 5-10 parts of boron powder, 3-5 parts of hafnium powder, 2-3 parts of alloy reinforcing agent, 0.5-1.5 parts of flux,

[0006] Wherein, the preparation method of the alloy reinforcing agent is as follows:

[0007] S1-1: 10-15 parts by weight of lanthanum nitrate hexahydrate are added to 50-60 parts by weight of deionized water, and ultrasonically stirred at 60°C for 30 minutes, and 5-10 parts by weight of nano-alumina are added, and stirring is continued for 2.5-3 hours, and the mixture is filtered and placed in a vacuum drying oven at 100°C for 6 hours to obtain powder A;

[0008] S1-2: Powder A is placed in a muffle furnace and calcined at 800-850 °C for 1.5 h, then placed in a ball mill and added with hard steel balls, with the ball-to-material ratio controlled at 10:1. After being filled with high-purity argon, the powder is ball milled on a planetary ball mill for 30 min, and passed through a 500-mesh sieve to obtain the alloy reinforcing agent.

[0009] Furthermore, the flux is a mixture of potassium chloride and magnesium fluoride, wherein potassium chloride and magnesium fluoride are mixed in a mass ratio of 1:(2-3).

[0010] Furthermore, the stirring speed in S1-1 is 750~850 r / min.

[0011] Furthermore, the calcination in the muffle furnace in S1-2 is carried out in a hydrogen atmosphere.

[0012] Furthermore, the ball milling speed in S1-2 is 300~400 r / min.

[0013] Furthermore, the preparation method of the nickel-based alloy plate is as follows:

[0014] S6-1: Nickel powder, molybdenum powder, zirconium powder, boron powder, hafnium powder and alloy reinforcing agent were mixed according to the formula and placed in a ball mill for ball milling. The ball milling was carried out under high-purity argon gas. The ball-to-material ratio was 10:1. The ball milling speed was set to 500-600 r / min. The ball milling time was 20-24 h. The ball milling method was 1 h and 1 h rest. The powder after ball milling was sieved with a 200-mesh screen to obtain mixed powder A.

[0015] S6-2: First, evacuate the furnace to a vacuum degree of 5×10 -3 Pa, high-purity argon is introduced to 0.8 atmospheres, and the smelting furnace is preheated to 200 ° C, the mixed powder A and the flux are added into the smelting furnace, the temperature is raised to 1000 ° C and kept warm for 20-30 min, then continued to be heated to 1500 ° C and kept warm for 30-40 min, and finally the temperature is raised to 1800 ° C and kept warm for 10-20 min, and the mixed melt is quickly poured into a mold preheated at 200 ° C to obtain the nickel-based alloy plate.

[0016] Furthermore, the thickness of the nickel-based alloy plate is 2.5 mm.

[0017] A method for preparing a nickel-based alloy composite plate, the specific steps of the method for preparing the composite plate are as follows:

[0018] S8-1: using anhydrous ethanol to clean the surfaces to be bonded of the 304 stainless steel base plate and the nickel-based alloy plate, and using 200 mesh, 500 mesh and 800 mesh sandpaper to grind the cleaned surfaces to be bonded step by step to obtain the pretreated 304 stainless steel base plate and the nickel-based alloy plate;

[0019] S8-2: The pre-treated 304 stainless steel base plate and the nickel-based alloy plate are combined by welding technology, and then cut and polished to obtain the nickel-based alloy composite plate.

[0020] Furthermore, the roughness of the surface to be bonded after the step-by-step grinding process in S8-1 is 3-5 μm.

[0021] Furthermore, the welding technology in S8-2 is laser welding, the laser beam spot diameter is 0.2 mm, the pulse frequency is 30 Hz, the voltage is 100 V, and the welding speed is 10 mm / s.

[0022] Nickel is the main component of the alloy, providing good mechanical strength, corrosion resistance and high temperature resistance; molybdenum can significantly improve the corrosion resistance, hardness and strength of the alloy, especially at high temperatures; the addition of copper can improve the electrical and thermal conductivity of the alloy, while improving corrosion resistance; boron can serve as a hard phase to enhance the hardness of the alloy, while improving wear resistance and corrosion resistance; hafnium has an extremely high melting point, which can further improve the high temperature resistance of the alloy. Using a mixture of potassium chloride and magnesium fluoride as a flux can reduce the melting point of the alloy during the smelting process and promote uniform mixing and reaction between the components.

[0023] The alloy reinforcement is prepared by mixing lanthanum and nano-alumina and sintering under high-temperature reducing gas protection, which can significantly improve the microstructure and performance of nickel-based alloys. Nano-alumina, with its excellent high hardness and high wear resistance as a hard phase, can greatly improve the wear resistance and hardness of the alloy, making it more suitable for harsh operating environments of high temperature, high pressure and corrosion; nano-alumina itself has good antioxidant properties and can effectively resist oxidation and corrosion of the alloy at high temperatures; at the same time, the lanthanum doped in the lattice further improves the antioxidant properties of nickel alloys by providing electrons to the nickel surface; the alloy reinforcement can form a dense and stable oxide film at high temperatures, effectively preventing oxygen from diffusing into the interior of the nickel-based alloy, thereby improving the high-temperature oxidation resistance of the nickel-based alloy.

[0024] In addition, alloying agents will inhibit the grain growth of nickel-based alloys during solidification, thereby refining the grains. Since fine grains can more effectively hinder the expansion of cracks, they help to improve the strength and toughness of the alloy. Alloying agents may change the nucleation and growth mechanism of nickel-based alloys during solidification. Alloying agents can serve as the core of heterogeneous nucleation, promote the formation of more nucleation points, and thus refine the grains. At the same time, the lanthanum element in the alloying agent may also affect the grain growth process by affecting the diffusion rate of solute atoms.

[0025] In addition, when a nickel-based alloy is subjected to external forces, the matrix grains will slide and deform to adapt to the external forces. However, when fine alloy reinforcement particles are evenly distributed in the alloy matrix, these particles act as obstacles and effectively limit the sliding and deformation between grains. This limiting effect enables the alloy to absorb and disperse more energy when subjected to force, thereby improving its strength and hardness, and giving the nickel-based alloy better creep resistance.

[0026] Induction melting is carried out in a step-by-step heating manner to ensure that all elements are fully melted and mixed evenly. First, the temperature is raised to 1000°C and kept warm to melt the low-melting-point elements into liquid form first; then the temperature is raised to 1500°C and kept warm to completely melt the high-melting-point metal and fully mix it with the melted elements to form a uniform melt; finally, the temperature is raised to 1800°C and kept warm to fully superheat the melt, reduce the melt viscosity, improve the diffusion capacity of each element, and further promote the homogenization of the alloy composition, thereby reducing the component segregation and coarse grains in the melt. In the process of step-by-step heating, the grain growth rate in the alloy melt can be controlled, and the solute atoms in the alloy can be redistributed and aggregated to form finer grains.

[0027] Beneficial effects of the present invention:

[0028] Using nickel as the alloy matrix, molybdenum, copper, boron, hafnium elements, alloy strengtheners and flux are introduced and heated step by step under vacuum melting to prepare fine-grained nickel-based alloys. The nickel-based alloy composite plate formed by combining the nickel-based alloy and stainless steel plate has the properties of high strength and high hardness, and is suitable for use in a variety of harsh working environments. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0030] The 304 stainless steel bottom plate used in the embodiments and comparative examples was purchased from Wuxi Youzhuo Stainless Steel Co., Ltd. and had a thickness of 3 mm.

[0031] Example 1

[0032] A nickel-based alloy composite plate comprises a 304 stainless steel bottom plate and a nickel-based alloy plate, wherein the formula 1 of the nickel-based alloy plate is as follows, in parts by weight, 40 parts of nickel powder, 12 parts of molybdenum powder, 8 parts of copper powder, 7 parts of boron powder, 4 parts of hafnium powder, 2.5 parts of alloy strengthener, and 1 part of flux, wherein the flux is a mixture of potassium chloride and magnesium fluoride, wherein the potassium chloride and magnesium fluoride are mixed in a mass ratio of 1:2.5.

[0033] Wherein, the preparation method of the alloy reinforcing agent is as follows:

[0034] S1-1: 12 parts by weight of lanthanum nitrate hexahydrate were added to 55 parts by weight of deionized water, and ultrasonically stirred at 60°C for 30 min at a stirring speed of 800 r / min, and 7 parts by weight of nano-alumina were added, and stirring was continued for 3 h. The mixture was filtered and dried in a vacuum drying oven at 100°C for 6 h to obtain powder A.

[0035] S1-2: Powder A was placed in a muffle furnace and calcined at 850 °C for 1.5 h in a hydrogen atmosphere, then placed in a ball mill and added with hard steel balls, with the ball-to-material ratio controlled at 10:1. After being filled with high-purity argon, the powder was ball milled on a planetary ball mill for 30 min at a ball milling speed of 350 r / min, and passed through a 500-mesh sieve to obtain the alloy reinforcing agent.

[0036] The preparation method of the nickel-based alloy plate is as follows:

[0037] S6-1: According to formula 1, nickel powder, molybdenum powder, zirconium powder, boron powder, hafnium powder and alloy reinforcing agent were mixed and placed in a ball mill for ball milling. The ball milling was carried out under high-purity argon gas. The ball-to-material ratio was 10:1. The ball milling speed was set to 550 r / min. The ball milling time was 22 h. The ball milling method was 1 h and 1 h rest. The ball milled powder was sieved with a 200-mesh screen to obtain mixed powder A.

[0038] S6-2: First, evacuate the furnace to a vacuum degree of 5×10 -3 Pa, high-purity argon is introduced to 0.8 atmospheres, and the smelting furnace is preheated to 200 ° C, the mixed powder A and the flux are added into the smelting furnace, the temperature is raised to 1000 ° C and kept warm for 25 min, then continued to be heated to 1500 ° C and kept warm for 35 min, and finally the temperature is raised to 1800 ° C and kept warm for 15 min, and the mixed melt is quickly poured into a mold preheated at 200 ° C to obtain the nickel-based alloy plate with a thickness of 2.5 mm.

[0039] A method for preparing a nickel-based alloy composite plate, the specific steps of the method for preparing the composite plate are as follows:

[0040] S8-1: The surfaces to be bonded of the 304 stainless steel base plate and the nickel-based alloy plate were cleaned with anhydrous ethanol, and the cleaned surfaces to be bonded were polished step by step with 200-mesh, 500-mesh and 800-mesh sandpapers to a roughness of 4 μm, thereby obtaining the pretreated 304 stainless steel base plate and the nickel-based alloy plate;

[0041] S8-2: The pretreated 304 stainless steel base plate and the nickel-based alloy plate are combined by laser welding technology. The laser beam spot diameter is 0.2 mm, the pulse frequency is 30 Hz, the voltage is 100 V, and the welding speed is 10 mm / s. The nickel-based alloy composite plate is then obtained after cutting and polishing.

[0042] Example 2

[0043] A nickel-based alloy composite plate comprises a 304 stainless steel bottom plate and a nickel-based alloy plate, wherein the formula 2 of the nickel-based alloy plate is as follows, in parts by weight, 35 parts of nickel powder, 10 parts of molybdenum powder, 5 parts of copper powder, 5 parts of boron powder, 3 parts of hafnium powder, 2 parts of alloy strengthener, and 0.5 parts of flux, wherein the flux is a mixture of potassium chloride and magnesium fluoride, wherein potassium chloride and magnesium fluoride are mixed in a mass ratio of 1:2.

[0044] Wherein, the preparation method of the alloy reinforcing agent is as follows:

[0045] S1-1: 10 parts by weight of lanthanum nitrate hexahydrate were added to 50 parts by weight of deionized water, and ultrasonically stirred at 60°C for 30 min at a stirring speed of 750 r / min, and 5 parts by weight of nano-alumina were added, and stirring was continued for 2.5 h. The mixture was filtered and dried in a vacuum drying oven at 100°C for 6 h to obtain powder A.

[0046] S1-2: Powder A is placed in a muffle furnace and calcined at 800 °C for 1.5 h in a hydrogen atmosphere, then placed in a ball mill and added with hard steel balls, with the ball-to-material ratio controlled at 10:1. After being filled with high-purity argon, the powder is ball milled on a planetary ball mill for 30 min at a ball milling speed of 300 r / min, and passed through a 500-mesh sieve to obtain the alloy reinforcing agent.

[0047] The preparation method of the nickel-based alloy plate is as follows:

[0048] S6-1: According to formula 2, nickel powder, molybdenum powder, zirconium powder, boron powder, hafnium powder and alloy reinforcing agent were mixed and placed in a ball mill for ball milling. The ball milling was carried out under high-purity argon gas. The ball-to-material ratio was 10:1. The ball milling speed was set to 500 r / min. The ball milling time was 20 h. The ball milling method was 1 h and 1 h rest. The ball milled powder was sieved with a 200-mesh screen to obtain mixed powder A.

[0049] S6-2: First, evacuate the furnace to a vacuum degree of 5×10 -3 Pa, high-purity argon is introduced to 0.8 atmospheres, and the smelting furnace is preheated to 200 ° C, the mixed powder A and the flux are added into the smelting furnace together, the temperature is raised to 1000 ° C and kept warm for 20 min, then continued to be heated to 1500 ° C and kept warm for 30 min, and finally the temperature is raised to 1800 ° C and kept warm for 10 min, and the mixed melt is quickly poured into a mold preheated at 200 ° C to obtain the nickel-based alloy plate with a thickness of 2.5 mm.

[0050] A method for preparing a nickel-based alloy composite plate, the specific steps of the method for preparing the composite plate are as follows:

[0051] S8-1: The surfaces to be bonded of the 304 stainless steel base plate and the nickel-based alloy plate were cleaned with anhydrous ethanol, and the cleaned surfaces to be bonded were polished step by step with 200-mesh, 500-mesh and 800-mesh sandpapers to a roughness of 3 μm, thereby obtaining the pretreated 304 stainless steel base plate and the nickel-based alloy plate;

[0052] S8-2: The pretreated 304 stainless steel base plate and the nickel-based alloy plate are combined by laser welding technology. The laser beam spot diameter is 0.2 mm, the pulse frequency is 30 Hz, the voltage is 100 V, and the welding speed is 10 mm / s. The nickel-based alloy composite plate is then obtained after cutting and polishing.

[0053] Example 3

[0054] A nickel-based alloy composite plate comprises a 304 stainless steel bottom plate and a nickel-based alloy plate, wherein the formula 3 of the nickel-based alloy plate is as follows, in parts by weight, 45 parts of nickel powder, 15 parts of molybdenum powder, 10 parts of copper powder, 10 parts of boron powder, 5 parts of hafnium powder, 3 parts of alloy strengthener, and 1.5 parts of flux, wherein the flux is a mixture of potassium chloride and magnesium fluoride, wherein potassium chloride and magnesium fluoride are mixed in a mass ratio of 1:2.5.

[0055] Wherein, the preparation method of the alloy reinforcing agent is as follows:

[0056] S1-1: 15 parts by weight of lanthanum nitrate hexahydrate were added to 60 parts by weight of deionized water, and ultrasonically stirred at 60°C for 30 min at a stirring speed of 850 r / min, and 10 parts by weight of nano-alumina were added, and stirring was continued for 3 h. The mixture was filtered and dried in a vacuum drying oven at 100°C for 6 h to obtain powder A.

[0057] S1-2: Powder A is placed in a muffle furnace and calcined at 850 °C for 1.5 h in a hydrogen atmosphere, then placed in a ball mill and added with hard steel balls, with the ball-to-material ratio controlled at 10:1. After being filled with high-purity argon, the powder is ball milled on a planetary ball mill for 30 min at a ball milling speed of 400 r / min, and passed through a 500-mesh sieve to obtain the alloy reinforcing agent.

[0058] The preparation method of the nickel-based alloy plate is as follows:

[0059] S6-1: According to formula 3, nickel powder, molybdenum powder, zirconium powder, boron powder, hafnium powder and alloy reinforcing agent were mixed and placed in a ball mill for ball milling. The ball milling was carried out under high-purity argon gas. The ball-to-material ratio was 10:1. The ball milling speed was set to 600 r / min. The ball milling time was 24 h. The ball milling method was 1 h and 1 h rest. The ball milled powder was sieved with a 200-mesh screen to obtain mixed powder A.

[0060] S6-2: First, evacuate the furnace to a vacuum degree of 5×10 -3 Pa, high-purity argon is introduced to 0.8 atmospheres, and the smelting furnace is preheated to 200 ° C, the mixed powder A and the flux are added into the smelting furnace, the temperature is raised to 1000 ° C and kept warm for 30 min, then continued to be heated to 1500 ° C and kept warm for 40 min, and finally the temperature is raised to 1800 ° C and kept warm for 20 min, and the mixed melt is quickly poured into a mold preheated at 200 ° C to obtain the nickel-based alloy plate with a thickness of 2.5 mm.

[0061] A method for preparing a nickel-based alloy composite plate, the specific steps of the method for preparing the composite plate are as follows:

[0062] S8-1: The surfaces to be bonded of the 304 stainless steel base plate and the nickel-based alloy plate were cleaned with anhydrous ethanol, and the cleaned surfaces to be bonded were polished step by step with 200-mesh, 500-mesh and 800-mesh sandpapers to a roughness of 5 μm, thereby obtaining the pretreated 304 stainless steel base plate and the nickel-based alloy plate;

[0063] S8-2: The pretreated 304 stainless steel base plate and the nickel-based alloy plate are combined by laser welding technology. The laser beam spot diameter is 0.2 mm, the pulse frequency is 30 Hz, the voltage is 100 V, and the welding speed is 10 mm / s. The nickel-based alloy composite plate is then obtained after cutting and polishing.

[0064] Comparative Example 1

[0065] No alloy reinforcing agent is added, and the remaining steps are consistent with those of Example 1.

[0066] Comparative Example 2

[0067] Lanthanum nitrate hexahydrate is not added in the preparation method of the alloy reinforcing agent, and the remaining steps are consistent with those in Example 1.

[0068] Comparative Example 3

[0069] Alumina is not added in the preparation method of the alloy reinforcing agent, and the remaining steps are consistent with Example 1.

[0070] The Vickers hardness of the embodiments and comparative examples was tested using a micro Vickers hardness tester (HVS-100 manual turret micro Vickers hardness tester) with a loading pressure of 10 N and a holding time of 15 s. 20 data points were tested and the average value was calculated.

[0071] The experimental data are summarized in the following table:

[0072]

[0073] It can be seen from the data of the examples and comparative examples that the alloy reinforcing agent prepared by using lanthanum and aluminum oxide together helps to refine the nickel-based alloy particles and significantly improve the strength of the nickel-based alloy.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A nickel-based alloy composite plate, characterized in that: It includes a 304 stainless steel base plate and a nickel-based alloy plate, wherein the nickel-based alloy plate has the following formula, in parts by weight, 35-45 parts of nickel powder, 10-15 parts of molybdenum powder, 5-10 parts of copper powder, 5-10 parts of boron powder, 3-5 parts of hafnium powder, 2-3 parts of alloy reinforcing agent, 0.5-1.5 parts of flux, Wherein, the preparation method of the alloy reinforcing agent is as follows: S1-1: 10-15 parts by weight of lanthanum nitrate hexahydrate are added to 50-60 parts by weight of deionized water, and ultrasonically stirred at 60°C for 30 minutes, and 5-10 parts by weight of nano-alumina are added, and stirring is continued for 2.5-3 hours, and the mixture is filtered and placed in a vacuum drying oven at 100°C for 6 hours to obtain powder A; S1-2: Powder A is placed in a muffle furnace and calcined at 800-850 °C for 1.5 h, then placed in a ball mill and added with hard steel balls, with the ball-to-material ratio controlled at 10:1, filled with high-purity argon gas, and ball milled on a planetary ball mill for 30 min, and passed through a 500-mesh sieve to obtain the alloy reinforcing agent; The preparation method of the nickel-based alloy plate is as follows: S6-1: Nickel powder, molybdenum powder, zirconium powder, boron powder, hafnium powder and alloy reinforcing agent were mixed according to the formula and placed in a ball mill for ball milling. The ball milling was carried out under high-purity argon gas. The ball-to-material ratio was 10:

1. The ball milling speed was set to 500-600 r / min. The ball milling time was 20-24 h. The ball milling method was 1 h and 1 h rest. The powder after ball milling was sieved with a 200-mesh screen to obtain mixed powder A. S6-2: First, evacuate the furnace to a vacuum degree of 5×10 -3 Pa, high-purity argon is introduced to 0.8 atmospheres, and the smelting furnace is preheated to 200 ° C, the mixed powder A and the flux are added into the smelting furnace, the temperature is raised to 1000 ° C and kept warm for 20-30 min, then continued to be heated to 1500 ° C and kept warm for 30-40 min, and finally the temperature is raised to 1800 ° C and kept warm for 10-20 min, and the mixed melt is quickly poured into a mold preheated at 200 ° C to obtain the nickel-based alloy plate.

2. A nickel-based alloy composite plate according to claim 1, characterized in that: The flux is a mixture of potassium chloride and magnesium fluoride, wherein potassium chloride and magnesium fluoride are mixed in a mass ratio of 1:(2-3).

3. A nickel-based alloy composite plate according to claim 1, characterized in that: The stirring speed in S1-1 is 750-850 r / min.

4. The nickel-based alloy composite plate according to claim 1, characterized in that: The calcination in the muffle furnace in S1-2 is carried out in a hydrogen atmosphere.

5. The nickel-based alloy composite plate according to claim 1, characterized in that: The ball milling speed in S1-2 is 300-400 r / min.

6. The nickel-based alloy composite plate according to claim 1, characterized in that: The thickness of the nickel-based alloy plate is 2.5 mm.

7. A method for preparing a nickel-based alloy composite plate according to any one of claims 1 to 6, characterized in that: The specific steps of the preparation method of the composite plate are as follows: S8-1: using anhydrous ethanol to clean the surfaces to be bonded of the 304 stainless steel base plate and the nickel-based alloy plate, and using 200 mesh, 500 mesh and 800 mesh sandpaper to grind the cleaned surfaces to be bonded step by step to obtain the pretreated 304 stainless steel base plate and the nickel-based alloy plate; S8-2: The pre-treated 304 stainless steel base plate and the nickel-based alloy plate are combined by welding technology, and then cut and polished to obtain the nickel-based alloy composite plate.

8. The method for preparing a nickel-based alloy composite plate according to claim 7, characterized in that: After the step-by-step grinding process in S8-1, the roughness of the surface to be bonded is 3-5 μm.

9. The method for preparing a nickel-based alloy composite plate according to claim 7, characterized in that: The welding technology in S8-2 is laser welding, the laser beam spot diameter is 0.2 mm, the pulse frequency is 30 Hz, the voltage is 100 V, and the welding speed is 10 mm / s.

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