A high-toughness carbon steel composite plate and its preparation process

Abstract

The present invention relates to a high-toughness carbon steel composite plate and its preparation process, belonging to the technical field of metal composite materials. The present invention proposes a high-toughness carbon steel composite plate comprising an inner carbon steel layer, an intermediate stainless steel plate, and an outer toughness coating. The outer toughness coating adopts a formulation of copper-zinc-nickel complex, tungsten carbide, natural rubber, ethanolamine, and deionized water, and through a fine preparation process, uniform dispersion and tight bonding among the components are achieved; the present invention optimizes the preparation process of the composite plate, including steps such as welding, polishing, spraying, laser drying, and hot pressing treatment, to ensure that the composite plate has excellent comprehensive properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal composite materials, and relates to a high-toughness carbon steel composite plate and a preparation process thereof. Background Art

[0002] In the field of materials science, composite plates are widely used in various industrial fields due to their excellent comprehensive properties. Among them, carbon steel composite plates have become one of the preferred materials in many industries due to their high strength, good processing performance, and relatively low cost.

[0003] However, traditional carbon steel composite plates still have limitations in toughness. Especially in extreme working environments, such as high temperature, high pressure, strong corrosion, or high impact load conditions, their comprehensive performance often fails to meet the requirements of complex working conditions. To improve the toughness of carbon steel composite plates, researchers have tried various methods, including adjusting the substrate composition, introducing ductile alloying elements, optimizing the heat treatment process, and developing new coating technologies.

[0004] Although these methods have improved the toughness of carbon steel composite plates to a certain extent, there are still some problems, such as complex processes, high costs, limited toughness improvement, or affecting other properties (such as strength and corrosion resistance). Therefore, developing a high-toughness carbon steel composite plate that can significantly improve toughness, maintain other excellent properties, and has a simple preparation process and controllable cost has become a research hotspot.

[0005] The present invention is proposed under this background, aiming to solve the problem of insufficient toughness of traditional carbon steel composite plates through innovative material design and preparation processes. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-toughness carbon steel composite plate and a preparation process thereof, which have the characteristics of high toughness.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A high-toughness carbon steel composite plate, the carbon steel composite plate includes an inner layer of carbon steel, an intermediate layer of stainless steel plate, and an outer layer of toughness coating,

[0009] The formula of the outer layer of toughness coating is, by mass percentage, 20 - 30% of copper-zinc-nickel complex, 20 - 30% of tungsten carbide, 20 - 30% of natural rubber, 10 - 15% of ethanolamine, and 10 - 15% of deionized water.

[0010] Among them, the preparation method of the copper-zinc-nickel complex is as follows,

[0011] S1.1: Mix copper nitrate pentahydrate, zinc nitrate hexahydrate, and nickel nitrate hexahydrate in a mass ratio of 5:2:3, grind at a rotation speed of 300 r / min for 15 - 30 min, then add 2 - 3 wt% oxalic acid monohydrate and continue grinding for 10 - 15 min to obtain a homogeneous and viscous mixture A;

[0012] S1.2: Mix mixture A and ammonia water with a concentration of (0.5 - 1) mol / L in a mass ratio of 1:1, ultrasonicate for 30 min, and then dry at 110 °C for 12 h to obtain mixture B;

[0013] S1.3: Heat mixture B from room temperature to 200 °C, keep it at a constant temperature and calcine for 1 - 2 h, then heat it to 350 °C, keep it at a constant temperature and calcine for 1 h. After calcination, crush and grind it to obtain a copper-zinc-nickel composite;

[0014] The preparation method of the outer tough coating is as follows.

[0015] S2.1: Mix the copper-zinc-nickel composite and tungsten carbide according to the formula ratio, put them into a ball mill and grind at a rotation speed of 400 r / min for 2 h to obtain mixture C;

[0016] S2.2: Heat natural rubber to 130 - 140 °C, stir in a blender at a rotation speed of 150 r / min for 1 - 2 h, add ethanolamine and deionized water according to the formula ratio, increase the rotation speed of the blender to 200 r / min, add mixture C, and stir for 3 - 4 h to obtain the coating.

[0017] Further, the heating rate from room temperature to 200 °C in S1.3 is 5 °C / min.

[0018] Further, the heating rate from 200 °C to 350 °C in S1.3 is 3 °C / min.

[0019] Further, the particle size of the copper-zinc-nickel composite obtained in S1.3 is 100 mesh.

[0020] Further, the particle size of mixture C in S2.1 is 200 mesh.

[0021] A preparation process of a high-toughness carbon steel composite plate, and the specific process flow of the preparation process of the high-toughness carbon steel composite plate is as follows.

[0022] S3.1: Place the inner carbon steel and the middle stainless steel in a vacuum-sealed environment, perform welding treatment on the two, and the welding parameters are that the welding vacuum degree ≤ 1.0 Pa, and in an argon atmosphere, the welding current is 80 - 100 A, and the welding depth is 50 - 80 mm;

[0023] S3.2: After welding is completed, polish the surface of the intermediate layer stainless steel, and after the polishing treatment, blow it with nitrogen at a speed of 10 m / s. After the blowing is completed, evenly spray the outer layer tough coating on the surface of the intermediate layer stainless steel by the spraying method, and let it stand for 1 - 2 h;

[0024] S3.3: Dry the coating by the laser drying method, and then further perform hot pressing treatment by the hot pressing method. The hot pressing parameters are a temperature of 60 - 70 °C, an applied force of 10 KN - 15 KN, and a hot pressing duration of 120 - 300 s. After hot pressing, first blow it with hydrogen at 80 °C for 1 h, and then blow it with nitrogen at 80 °C for 0.5 h to obtain the high-toughness carbon steel composite plate.

[0025] Further, in S3.2, the polishing parameters are to first polish with a grinding head composed of 500-mesh elastic modules at 1 - 2 MPa for 1 h, and then polish with a grinding head composed of 2000-mesh elastic modules at 0.3 - 0.5 MPa for 0.5 h.

[0026] Further, in S3.2, the spraying parameters are a spraying distance of 100 mm and a spraying rate of 60 mm / s.

[0027] Further, in S3.3, the laser drying parameters are a laser power of 260 - 300 W, a temperature of 50 - 60 °C, and an irradiation duration of 20 - 30 min.

[0028] Further, in S3.3, the blowing flow rates of hydrogen and nitrogen are 20 m / s.

[0029] The present invention provides a high-toughness carbon steel composite plate including an inner layer carbon steel, an intermediate layer stainless steel plate, and an outer layer tough coating. The outer layer tough coating adopts a formulation of copper-zinc-nickel complex, tungsten carbide, natural rubber, ethanolamine, and deionized water, and realizes the uniform dispersion and tight combination among the components through a fine preparation process. At the same time, the present invention also optimizes the preparation process of the composite plate, including steps such as welding, polishing, spraying, laser drying, and hot pressing treatment, to ensure that the composite plate has excellent comprehensive performance.

[0030] By welding the inner carbon steel and the middle layer of stainless steel in a vacuum-sealed environment and controlling parameters such as welding vacuum, welding atmosphere, welding current, and welding depth, oxidation and contamination during the welding process are significantly reduced, ensuring the quality and strength of the welded joint. After welding, the surface of the middle layer of stainless steel is polished to remove surface defects and dirt generated during welding, improving the surface finish and flatness. Subsequently, nitrogen is used for purging to further clean the surface, providing a good foundation for the spraying of the outer tough coating. The present invention uses the spraying method to evenly spray the outer tough coating on the surface of the middle layer of stainless steel and allows it to stand for a period of time to enable the coating to fully bond with the substrate, improving the adhesion and durability of the coating. The present invention uses the laser drying method to dry the coating, which can remove solvents and moisture in the coating, avoiding problems such as cracking and peeling of the coating during subsequent processing. Then, the hot pressing method is used to further hot press the coating to enhance the bonding force between the coating and the substrate, while improving the density and hardness of the coating. After hot pressing, hydrogen and nitrogen are used for purging to further remove residual gases and impurities in the coating, improving the purity and quality of the coating. Utilizing the reducibility of hydrogen, oxides that may exist on the surface of the composite plate are reduced at high temperature, thereby removing these oxide impurities and ensuring the cleanliness of the surface of the composite plate. At the same time, hydrogen purging can also help remove gas residues that may be generated during hot pressing and tiny bubbles that may exist between the coating and the substrate, enhancing the bonding force between the coating and the substrate. Finally, nitrogen purging is used to further clean the surface of the composite plate, improving its surface purity and finish.

[0031] The present invention prepares a high-toughness carbon steel composite plate including an inner carbon steel layer, a middle layer of stainless steel plate, and an outer tough coating. The inner carbon steel layer provides the main strength and rigidity of the composite plate, enabling the composite plate to withstand large loads and stresses. The middle layer of stainless steel plate has good corrosion resistance and oxidation resistance, which can effectively prevent the composite plate from being corroded and oxidized during use and extend its service life. The outer tough coating enhances the toughness and wear resistance of the composite plate, improving its ability to resist impact, scratches, and abrasion, while also improving the surface properties of the composite plate, making it smoother and more beautiful.

[0032] Through steps such as grinding, mixing, drying, and roasting, chemical reactions occur among copper, zinc, and nickel elements under the action of oxalic acid and ammonia water to form uniform composite particles, which play a role in strengthening and dispersing in the coating. As one of the main components of the coating, the copper-zinc-nickel composite has excellent electrical conductivity, thermal conductivity, and corrosion resistance. In the coating, it can form a dense protective film to prevent the external environment from eroding the composite board; tungsten carbide is a material with extremely high hardness, which can significantly improve the hardness and wear resistance of the coating. In the coating, tungsten carbide particles play a role in wear resistance and hardness enhancement, making the composite board more durable; natural rubber has good elasticity and toughness, which can increase the flexibility and impact resistance of the coating. In the coating, natural rubber plays a role in buffering and shock absorption, enabling the composite board to reduce damage when impacted. In this invention, the natural rubber is purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd., with the product number PB959232.

[0033] During the preparation process, the copper-zinc-nickel composite undergoes steps such as grinding, mixing, drying, and roasting to form a uniform and dense particle structure. These particles can be closely arranged in the coating to form a continuous network structure, improving the overall strength and toughness of the coating; tungsten carbide particles can form a wear-resistant "skeleton" in the coating and jointly form a wear-resistant layer with the copper-zinc-nickel composite, significantly improving the wear resistance of the coating; the polar groups in natural rubber can form chemical bonding and physical adsorption with the copper-zinc-nickel composite and tungsten carbide particles, thereby improving the adhesion between the coating and the substrate. The improvement of this adhesion helps the coating to form a more firm bond on the surface of the composite board.

[0034] Components such as the copper-zinc-nickel composite, tungsten carbide, and natural rubber interact synergistically in the coating to jointly improve the hardness, wear resistance, and toughness of the coating; the addition of ethanolamine and deionized water enables various components in the coating to be evenly dispersed in the coating, forming a dense coating structure; the uniformity and density of the coating make the surface of the composite board smoother and more beautiful, while improving its scratch and wear resistance.

[0035] The beneficial effects of this invention:

[0036] This invention proposes a high-toughness carbon steel composite board comprising an inner layer of carbon steel, an intermediate layer of stainless steel plate, and an outer layer of tough coating. The outer layer of tough coating adopts a formulation of copper-zinc-nickel composite, tungsten carbide, natural rubber, ethanolamine, and deionized water, and through a fine preparation process, uniform dispersion and tight combination among various components are achieved; this invention optimizes the preparation process of the composite board, including steps such as welding, polishing, spraying, laser drying, and hot pressing treatment, to ensure that the composite board has excellent wear resistance and toughness. Specific embodiments

[0037] To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in combination with embodiments, elaborate in detail on the specific implementation manners, structures, features and their effects according to the present invention as follows.

[0038] Coating formula 1: 30% copper-zinc-nickel complex, 30% tungsten carbide, 20% natural rubber, 10% ethanolamine, 10% deionized water;

[0039] Coating formula 2: 20% copper-zinc-nickel complex, 20% tungsten carbide, 30% natural rubber, 15% ethanolamine, 15% deionized water;

[0040] Coating formula 3: 25% copper-zinc-nickel complex, 25% tungsten carbide, 25% natural rubber, 10% ethanolamine, 15% deionized water.

[0041] Example 1

[0042] Among them, the preparation method of the copper-zinc-nickel complex is as follows.

[0043] S1.1: Mix copper nitrate pentahydrate, zinc nitrate hexahydrate, and nickel nitrate hexahydrate in a mass ratio of 5:2:3, grind at a rotation speed of 300 r / min for 20 min, then add 2 wt% oxalic acid monohydrate, and continue grinding for 10 - 15 min to obtain a uniform and viscous mixture A;

[0044] S1.2: Mix mixture A and ammonia water with a concentration of 1 mol / L in a mass ratio of 1:1, ultrasonicate for 30 min, and then dry at 110 °C for 12 h to obtain mixture B;

[0045] S1.3: Heat mixture B from room temperature to 200 °C at a heating rate of 5 °C / min, keep it at a constant temperature and calcine for 2 h, then heat it to 350 °C at a heating rate of 3 °C / min, keep it at a constant temperature and calcine for 1 h. After the calcination is completed, crush and grind to obtain the copper-zinc-nickel complex. The particle size of the copper-zinc-nickel complex is 100 mesh;

[0046] The preparation method of the outer tough coating is as follows.

[0047] S2.1: Mix the copper-zinc-nickel complex and tungsten carbide according to the formula ratio, put them into a ball mill and grind at a rotation speed of 400 r / min for 2 h to obtain mixture C, and the particle size is 200 mesh;

[0048] S2.2: Heat the natural rubber to 135 °C, stir in a blender at a rotation speed of 150 r / min for 1 h, add ethanolamine and deionized water according to the formula ratio, increase the rotation speed of the blender to 200 r / min, add mixture C, and stir for 3 h to obtain the coating.

[0049] A preparation process of a high-toughness carbon steel composite plate, and the specific process of the preparation process of the high-toughness carbon steel composite plate is as follows.

[0050] S3.1: Place the inner carbon steel and the middle-layer stainless steel in a vacuum-sealed environment, and perform welding treatment on the two. The welding parameters are that the welding vacuum degree ≤ 1.0 Pa. Under an argon atmosphere, the welding current is 80 A, and the welding depth is 70 mm;

[0051] S3.2: After welding, perform polishing and grinding treatment on the surface of the middle-layer stainless steel. The parameters of polishing and grinding are to first use a grinding head composed of 500-mesh elastic modules to grind for 1 h under 2 MPa, then use a grinding head composed of 2000-mesh elastic modules to grind for 0.5 h under 0.5 MPa. After grinding treatment, use nitrogen at 10 m / s for purging. After purging is completed, use the spraying method to evenly spray the outer-layer toughness coating on the surface of the middle-layer stainless steel. The spraying parameters are a spraying distance of 100 mm, a spraying rate of 60 mm / s, and stand for 1 h;

[0052] S3.3: Use the laser drying method to dry the coating. The parameters of laser drying are a laser power of 300 W, a temperature of 50 °C, and an irradiation duration of 20 min. Then use the hot pressing method for further hot pressing treatment. The hot pressing parameters are a temperature of 70 °C, an applied force of 10 KN, and a hot pressing duration of 200 s. After hot pressing, first use hydrogen at 80 °C for purging. The purging flow rate of hydrogen is 20 m / s, and the purging duration is 1 h. Then use nitrogen at 80 °C for purging. The purging duration is 0.5 h, and the purging flow rate of nitrogen is 20 m / s to obtain the high-toughness carbon steel composite plate.

[0053] Example 2

[0054] Among them, the preparation method of the copper-zinc-nickel composite is as follows,

[0055] S1.1: Mix copper nitrate pentahydrate, zinc nitrate hexahydrate, and nickel nitrate hexahydrate according to a mass ratio of 5:2:3, grind at a rotation speed of 300 r / min for 30 min, then add 3 wt% oxalic acid monohydrate, and continue to grind for 10 min to obtain a uniform and viscous mixture A;

[0056] S1.2: Mix mixture A and ammonia water with a concentration of 0.5 mol / L according to a mass ratio of 1:1. After ultrasonic treatment for 30 min, dry at 110 °C for 12 h to obtain mixture B;

[0057] S1.3: Heat mixture B from room temperature to 200 °C at a heating rate of 5 °C / min. After constant temperature, calcine for 2 h, then heat up to 350 °C at a heating rate of 3 °C / min. After constant temperature, calcine for 1 h. After calcination is completed, pulverize and grind to obtain the copper-zinc-nickel composite. The particle size of the copper-zinc-nickel composite is 100 mesh;

[0058] The preparation method of the outer layer tough coating is as follows:

[0059] S2.1: Mix the copper-zinc-nickel complex and tungsten carbide according to the formula ratio, put them into a ball mill and grind at a speed of 400 r / min for 2 h to obtain mixture C with a particle size of 200 mesh.

[0060] S2.2: Heat natural rubber to 130 °C, stir in a blender at a speed of 150 r / min for 2 h, add ethanolamine and deionized water according to the formula ratio, increase the blender speed to 200 r / min, add mixture C, and stir for 3 h to obtain the coating.

[0061] A preparation process of a high-toughness carbon steel composite plate, and the specific process of the preparation process of the high-toughness carbon steel composite plate is as follows.

[0062] S3.1: Place the inner layer carbon steel and the middle layer stainless steel in a vacuum-sealed environment and perform welding treatment on the two. The welding parameters are that the welding vacuum degree ≤ 1.0 Pa, and in an argon atmosphere, the welding current is 100 A and the welding depth is 80 mm.

[0063] S3.2: After welding, polish the surface of the middle layer stainless steel. The polishing parameters are to first use a grinding head composed of 500-mesh elastic modules to polish at 2 MPa for 1 h, then use a grinding head composed of 2000-mesh elastic modules to polish at 0.4 MPa for 0.5 h. After the polishing treatment, blow it with nitrogen at 10 m / s. After the blowing is completed, use the spraying method to evenly spray the outer layer tough coating on the surface of the middle layer stainless steel. The spraying parameters are a spraying distance of 100 mm, a spraying rate of 60 mm / s, and stand still for 2 h.

[0064] S3.3: Use the laser drying method to dry the coating. The laser drying parameters are a laser power of 260 W, a temperature of 60 °C, and an irradiation time of 30 min. Then use the hot pressing method for further hot pressing treatment. The hot pressing parameters are a temperature of 60 °C, an applied force of 15 KN, and a hot pressing time of 300 s. After hot pressing, first blow it with hydrogen at 80 °C. The blowing flow rate of hydrogen is 20 m / s and the blowing time is 1 h. Then blow it with nitrogen at 80 °C. The blowing time is 0.5 h and the blowing flow rate of nitrogen is 20 m / s to obtain the high-toughness carbon steel composite plate.

[0065] Example 3

[0066] Among them, the preparation method of the copper-zinc-nickel complex is as follows:

[0067] S1.1: Mix cupric nitrate pentahydrate, zinc nitrate hexahydrate, and nickel nitrate hexahydrate in a mass ratio of 5:2:3, grind them at a rotation speed of 300 r / min for 15 min, then add 3 wt% oxalic acid monohydrate and continue grinding for 15 min to obtain a homogeneous viscous mixture A;

[0068] S1.2: Mix mixture A and ammonia water with a concentration of 1 mol / L in a mass ratio of 1:1, ultrasonicate for 30 min, and then dry at 110 °C for 12 h to obtain mixture B;

[0069] S1.3: Heat mixture B from room temperature to 200 °C at a heating rate of 5 °C / min, calcine for 1 h after constant temperature, then heat to 350 °C at a heating rate of 3 °C / min, calcine for 1 h after constant temperature, and pulverize and grind after calcination to obtain a copper-zinc-nickel composite. The particle size of the copper-zinc-nickel composite is 100 mesh;

[0070] The preparation method of the outer tough coating is as follows.

[0071] S2.1: Mix the copper-zinc-nickel composite and tungsten carbide according to the formula ratio, put them into a ball mill and grind at a rotation speed of 400 r / min for 2 h to obtain mixture C with a particle size of 200 mesh;

[0072] S2.2: Heat natural rubber to 140 °C, stir in a blender at a rotation speed of 150 r / min for 2 h, add ethanolamine and deionized water according to the formula ratio, increase the rotation speed of the blender to 200 r / min, add mixture C, and stir for 3 h to obtain the coating.

[0073] The preparation process of a high-toughness carbon steel composite plate is as follows.

[0074] S3.1: Place the inner carbon steel and the middle-layer stainless steel in a vacuum-sealed environment and perform welding on the two. The welding parameters are as follows: the welding vacuum degree ≤ 1.0 Pa, under an argon atmosphere, the welding current is 100 A, and the welding depth is 50 mm;

[0075] S3.2: After welding, polish and grind the surface of the middle-layer stainless steel. The polishing and grinding parameters are as follows: first use a grinding head composed of 500-mesh elastic modules to grind at 2 MPa for 1 h, then use a grinding head composed of 2000-mesh elastic modules to grind at 0.3 MPa for 0.5 h. After grinding, blow it with nitrogen at 10 m / s. After blowing, use the spraying method to evenly spray the outer tough coating on the surface of the middle-layer stainless steel. The spraying parameters are as follows: the spraying distance is 100 mm, the spraying rate is 60 mm / s, and let it stand for 2 h;

[0076] S3.3: Dry the coating using the laser drying method. The parameters for laser drying are a laser power of 300 W, a temperature of 60 °C, and an irradiation duration of 30 min. Then, further perform hot pressing using the hot pressing method. The hot pressing parameters are a temperature of 70 °C, an applied force of 15 KN, and a hot pressing duration of 120 s. After hot pressing, first purge with hydrogen at 80 °C. The purge flow rate of hydrogen is 20 m / s, and the purge duration is 1 h. Then, purge with nitrogen at 80 °C. The purge duration is 0.5 h, and the purge flow rate of nitrogen is 20 m / s, to obtain the high-toughness carbon steel composite plate.

[0077] Comparative Example 1

[0078] In this comparative example, no coating is sprayed on the surface, and the remaining steps are the same as those in Example 1.

[0079] Comparative Example 2

[0080] In this comparative example, the coating is not dried using the laser drying method, and the remaining steps are the same as those in Example 1.

[0081] Comparative Example 3

[0082] In this comparative example, the coating is not hot pressed, and the remaining steps are the same as those in Example 1.

[0083] Comparative Example 4

[0084] In this comparative example, the stainless steel surface is not polished and ground, and the remaining steps are the same as those in Example 1.

[0085] Conduct a tensile test on the examples and comparative examples according to the standard of GB / T 228.1-2021. The experimental data is organized in the following table.

[0086] Conduct wear resistance detection on the examples and comparative examples. Use a JM IV type abrasion tester and the rotating friction rubber wheel method. After grinding 100 revolutions, the average value of the sample loss (weight loss method) is used to measure the wear resistance of the present invention. The applied load is 10 N, the rotation speed is 80 r / min, the test temperature is 25 °C, the relative humidity is 50%, and the mass is measured accurately to 0.01 mg. Take the average value of 3 measurements as the result. The detection results are organized in the following table.

[0087]

[0088] It can be seen from the experimental data that the high-toughness carbon steel composite plate prepared by the present invention has better tensile strength and wear resistance.

[0089] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high-toughness carbon steel composite plate, characterized in that: The carbon steel composite plate comprises an inner layer of carbon steel, a middle layer of stainless steel plate and an outer layer of tough coating. The outer toughness coating has a formula of 20-30% copper-zinc-nickel compound, 20-30% tungsten carbide, 20-30% natural rubber, 10-15% ethanolamine, and 10-15% deionized water, by mass percentage. The preparation method of the copper-zinc-nickel composite is as follows: S1.1: Copper nitrate pentahydrate, zinc nitrate hexahydrate, and nickel nitrate hexahydrate are mixed in a mass ratio of 5:2:3, and ground at a speed of 300 r / min for 15-30 min, and then 2-3 wt% oxalic acid monohydrate is added, and the grinding is continued for 10-15 min to obtain a uniform and viscous mixture A; S1.2: Mix the mixture A and aqueous ammonia with a concentration of (0.5-1) mol / L in a mass ratio of 1:1, ultrasonicate for 30 min, and dry at 110 °C for 12 h to obtain a mixture B; S1.3: The mixture B is heated from room temperature to 200°C, kept at a constant temperature and then roasted for 1-2 hours, then heated to 350°C, kept at a constant temperature and then roasted for 1 hour, and after roasting, it is crushed and ground to obtain a copper-zinc-nickel composite; The outer toughness coating preparation method is as follows: S2.1: Mix the copper-zinc-nickel composite and tungsten carbide according to the formula ratio, put them into a ball mill and grind them at a speed of 400 r / min for 2 hours to obtain a mixture C; S2.2: Heat the natural rubber to 130-140° C., stir it in a stirrer at a speed of 150 r / min for 1-2 h, add ethanolamine and deionized water according to the formula ratio, increase the stirrer speed to 200 r / min, add mixture C, stir for 3-4 h, and obtain the coating.

2. The high-toughness carbon steel composite plate according to claim 1, characterized in that: The rate of heating from room temperature to 200°C in S1.3 is 5°C / min.

3. The high-toughness carbon steel composite plate according to claim 1, characterized in that: The rate of heating from 200°C to 350°C in S1.3 is 3°C / min.

4. The high-toughness carbon steel composite plate according to claim 1, characterized in that: The copper-zinc-nickel composite obtained in S1.3 has a particle size of 100 mesh.

5. The high-toughness carbon steel composite plate according to claim 1, characterized in that: The particle size of the mixture C in S2.1 is 200 mesh.

6. A process for preparing a high-toughness carbon steel composite plate, based on a high-toughness carbon steel composite plate according to any one of claims 1 to 5, characterized in that: The specific process of the preparation process of the high-toughness carbon steel composite plate is as follows: S3.1: Place the inner carbon steel and the middle stainless steel in a vacuum sealed environment and weld them together. The welding parameters are: welding vacuum degree ≤ 1.0Pa, welding current 80~100A, welding depth 50~80mm under argon atmosphere; S3.2: After welding, the surface of the middle layer stainless steel is polished and ground. After polishing, it is purged with 10m / s nitrogen. After purging, the outer toughness coating is evenly sprayed on the surface of the middle layer stainless steel by spraying method and left to stand for 1~2h; S3.3: The coating is dried by a laser drying method, and then further hot-pressed by a hot pressing method. The hot pressing parameters are a temperature of 60-70°C, an applied force of 10KN-15KN, and a hot pressing time of 120-300s. After hot pressing, it is first purged with 80°C hydrogen for 1 hour, and then purged with 80°C nitrogen for 0.5 hours to obtain the high-toughness carbon steel composite plate.

7. The process for preparing a high-toughness carbon steel composite plate according to claim 6, characterized in that: The polishing parameters in S3.2 are as follows: first, use a grinding head composed of 500-mesh elastic modules to polish at 1-2 MPa for 1 hour, and then use a grinding head composed of 2000-mesh elastic modules to polish at 0.3-0.5 MPa for 0.5 hour.

8. The process for preparing a high-toughness carbon steel composite plate according to claim 6, characterized in that: The spraying parameters in S3.2 are spraying distance 100 mm and spraying rate 60 mm / s.

9. The process for preparing a high-toughness carbon steel composite plate according to claim 6, characterized in that: The parameters of the laser drying in S3.3 are: laser power 260-300 W, temperature 50-60° C., and irradiation time 20-30 min.

10. The process for preparing a high-toughness carbon steel composite plate according to claim 6, characterized in that: The purge flow rate of hydrogen and nitrogen in S3.3 is 20 m / s.

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