Corrosion-resistant alloy powder and method for producing the same

Abstract

The application discloses a kind of corrosion-resistant alloy powder and preparation method thereof, belong to alloy technical field.The corrosion-resistant alloy powder includes nickel alloy base material, aluminum nitride and silicon carbide;The aluminum nitride is 10-15% of the mass of the nickel alloy base material, and the silicon carbide is 5-10% of the mass of the nickel alloy base material.In addition, the application also proposes a kind of preparation method of the above-mentioned corrosion-resistant alloy powder, including the following steps: S1, according to the component allocation ratio, nickel-based alloy base material, aluminum nitride is mixed, then first ball milling is carried out, then first smelting is carried out, then first atomization powder is carried out to obtain modified nickel-based alloy powder;S2, the modified nickel-based alloy powder and silicon carbide are mixed, then second ball milling is carried out, then second smelting is carried out, then second atomization powder is carried out to obtain the corrosion-resistant alloy powder.The alloy powder proposed in the application has excellent corrosion resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alloy, in particular to a kind of corrosion-resistant alloy powder and preparation method thereof. BACKGROUND

[0002] In many key industrial fields such as chemical industry, energy, marine engineering, the corrosion problem of metal materials has been an important factor restricting the long-term stable operation of equipment and increasing maintenance cost.For example, in marine environment, seawater contains a large amount of salt, dissolved oxygen and other corrosive substances, and metal structural parts will suffer from various corrosion forms such as electrochemical corrosion and pitting corrosion;in the process of chemical production, various corrosive media such as acid and alkali will cause serious erosion to equipment.Although traditional corrosion-resistant metal materials such as stainless steel and some copper alloys have certain corrosion resistance, their corrosion resistance cannot meet the demand under extreme conditions, and they also have problems such as insufficient mechanical properties and difficult processing.

[0003] To improve the corrosion resistance of materials, researchers try to develop new corrosion-resistant alloys by adjusting alloy composition and optimizing preparation process.Among them, nickel-based alloy has become one of the research hotspots due to its good high-temperature resistance, corrosion resistance and comprehensive mechanical properties.However, the corrosion resistance and mechanical properties of conventional nickel-based alloy still need to be improved when it faces high-concentration strong corrosive medium and complex stress environment.Under this background, developing high-performance corrosion-resistant alloy powder by adding special strengthening phase, optimizing alloy element ratio and preparation process has become a key direction to solve the above problems.

[0004] How to improve the corrosion resistance of alloy powder is a technical problem to be solved in the prior art. SUMMARY

[0005] In the research of alloy strengthening phase, aluminum nitride and silicon carbide, as excellent ceramic materials, have high hardness, high chemical stability and good high-temperature performance etc.Introducing them into metal alloy system may significantly improve the hardness, wear resistance and corrosion resistance of the alloy through dispersion strengthening and improving surface passivation film etc.In the field of alloy preparation process, the synergistic application of ball milling, vacuum melting and atomization powder preparation etc.may further tap the performance potential of the alloy.However, at present, how to reasonably design the composition of nickel-based alloy containing aluminum nitride and silicon carbide, and optimize the preparation process parameters to realize the synergistic improvement of alloy corrosion resistance and other performances, is still a technical problem to be solved urgently.The corrosion-resistant alloy powder scheme of the present application is proposed based on this demand, aiming to provide a new technical approach to solve the material problem under complex corrosion environment.

[0006] Therefore, the purpose of the present application is to overcome the above technical deficiencies, provide a kind of corrosion-resistant alloy powder and preparation method thereof, solve the technical problem of how to improve the corrosion resistance of alloy powder in the prior art.

[0007] To achieve the above technical purpose, the technical scheme of the present application provides a kind of corrosion-resistant alloy powder, including nickel alloy base material, aluminum nitride and silicon carbide;The aluminum nitride is 10-15% of the mass of the nickel alloy base material, and the silicon carbide is 5-10% of the mass of the nickel alloy base material.

[0008] In any embodiment, the mass percentage of the nickel alloy base material is composed of: 45-50wt% of Ni, 3-7wt% of Mg, 1-3wt% of Zn, 4-7wt% of Mn, 0.5-1.0wt% of Ce, and the balance is Cu.

[0009] Furthermore, the present application also proposes a kind of preparation method of the above-mentioned corrosion-resistant alloy powder, comprising the following steps:

[0010] S1, according to the proportion of each component, nickel-based alloy base material, aluminum nitride is mixed, then first ball milling is carried out, then first smelting is carried out, then first atomization powder is obtained to obtain modified nickel-based alloy powder;

[0011] S2, the modified nickel-based alloy powder and silicon carbide are mixed, then second ball milling is carried out, then second smelting is carried out, then second atomization powder is obtained to obtain the corrosion-resistant alloy powder.

[0012] In any embodiment, in step S1, the rotation speed of the first ball milling is 200-400rpm, and the ball milling time is 1-3h.

[0013] In any embodiment, in step S1, the first smelting is vacuum smelting, the temperature of the first smelting is 1400-1500℃, the vacuum degree is <1.0×10 -2 Pa, and the smelting time is 0.5-1h.

[0014] In any embodiment, in step S1, the pressure of the first atomization powder is 2.5-3MPa.

[0015] In any embodiment, in step S2, the second smelting is vacuum smelting, the temperature of the second smelting is 1600-1700℃, the vacuum degree is <1.0×10 -2 Pa, and the smelting time is 0.5-1h.

[0016] In any embodiment, in step S2, the rotation speed of the second ball milling is 300-400rpm.

[0017] In any embodiment, in step S2, the second ball milling time is 1-2h.

[0018] In any embodiment, the pressure of the second atomization powdering in step S2 is 3-3.5 MPa.

[0019] Compared with the prior art, the beneficial effects of the present application include: the aluminum nitride is 10-15% of the mass of the nickel alloy base material, and the nitrogen atoms generated by the decomposition of the aluminum nitride are dissolved into the nickel-based alloy to form nitrides. These nitrides can refine the grains, increase the resistance to dislocation movement, and improve the hardness of the alloy. At the same time, the presence of nitrides can improve the passivation film on the surface of the alloy, making it more protective and improving corrosion resistance. The silicon carbide is 5-10% of the mass of the nickel alloy base material, and the silicon carbide reacts with certain elements (such as nickel, copper, etc.) in the alloy to form carbides (such as Ni3C, etc.) with high hardness. These carbides are dispersedly distributed in the alloy matrix, like "dispersion strengthening phase", hindering the movement of dislocations, and improving the hardness and wear resistance of the alloy. In addition, silicon carbide can further form a protective film on the surface of the alloy, preventing the corrosion of corrosive media, improving corrosion resistance, and thus the alloy powder has excellent corrosion resistance. DETAILED DESCRIPTION

[0020] The "ranges" disclosed herein are defined by their lower and upper limits, given that a range is defined by selecting a lower limit and an upper limit, the selected lower and upper limits define the boundaries of the particular range. Ranges defined by the lower and upper limits can be inclusive or exclusive of the end values, and can be arbitrarily combined, i.e., any lower limit can be combined with any upper limit to form a range. For example, if a range of 60-120 and 80-110 is listed for a particular parameter, it is understood that a range of 60-110 and 80-120 is also contemplated. In addition, if a minimum range value of 1 and 2 is listed, and if a maximum range value of 3, 4, and 5 is listed, then the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, a numerical range "a-b" indicates a shorthand way of describing each and every intervening real number between the upper and lower limits of that range, wherein a and b are both real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed herein, and "0-5" is merely a shorthand way of describing those numerical combinations. In addition, when a parameter is stated to be an integer ≥ 2, it is equivalent to disclose that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0021] Unless otherwise specified, "comprise", "comprising", "include", "including" and "contains", "containing" as used herein, are intended to be open-ended, and also to mean including, but not limited to.

[0022] If not specifically stated, the term "or" in this application is inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, any of the following satisfy the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0023] The specific embodiment provides a corrosion-resistant alloy powder, comprising a nickel alloy base material, aluminum nitride and silicon carbide; the aluminum nitride is 10-15% of the mass of the nickel alloy base material, and the silicon carbide is 5-10% of the mass of the nickel alloy base material; the mass percentage of the nickel alloy base material is composed of 45-50wt% of Ni, 3-7wt% of Mg, 1-3wt% of Zn, 4-7wt% of Mn, 0.5-1.0wt% of Ce, and the balance of Cu.

[0024] The specific embodiment also provides a preparation method of the above-mentioned corrosion-resistant alloy powder, comprising the following steps:

[0025] S1, according to the allocation ratio of each component, the nickel-based alloy base material and aluminum nitride are mixed, then first ball milling is carried out, then first smelting is carried out, then first atomization powdering is carried out to obtain a modified nickel-based alloy powder; the rotation speed of the first ball milling is 200-400rpm, and the ball milling time is 1-3h; the first smelting is vacuum smelting, the temperature of the first smelting is 1400-1500℃, and the vacuum degree is <1.0×10 -2 Pa, and the smelting time is 0.5-1h; the pressure of the first atomization powdering is 2.5-3MPa;

[0026] S2, the modified nickel-based alloy powder and silicon carbide are mixed, then second ball milling is carried out, then second smelting is carried out, and then second atomization powdering is carried out to obtain the corrosion-resistant alloy powder; the second smelting is vacuum smelting, the temperature of the second smelting is 1600-1700℃, and the vacuum degree is <1.0×10 -2 Pa, and the smelting time is 0.5-1h; the rotation speed of the second ball milling is 300-400rpm, the time of the second ball milling is 1-2h; and the pressure of the second atomization powdering is 3-3.5MPa.

[0027] The first ball milling and the first high-temperature smelting make the nickel-based alloy substrate fully melt with aluminum nitride, and the nitrogen atoms generated by the decomposition of aluminum nitride are dissolved into the nickel-based alloy to form nitrides. The nitrogen atom has a small radius, and after entering the crystal lattice, it can cause lattice distortion and produce solid solution strengthening effect, thereby improving the hardness of the alloy. In addition, the formation of nitrides can also refine the grains. According to the Hall-Petch formula, grain refinement can improve the strength and hardness of the alloy, and is also beneficial to improving the corrosion resistance, because the small grains can increase the grain boundary area, the atomic arrangement at the grain boundary is irregular, and the energy is higher, which is more prone to form a dense passivation film to prevent the invasion of corrosive media; the modified nickel-based alloy powder is mixed with silicon carbide. Ball milling makes the silicon carbide particles uniformly distributed in the modified nickel-based alloy powder, and further refines the powder particles, increases the activity and defects of the particle surface, which is beneficial to the combination of silicon carbide and alloy powder in the subsequent smelting process, and then the temperature is 1600-1700 ℃, the vacuum degree is <1.0×10 - 2 Pa, the smelting time is 0.5-1h, the second smelting, at high temperature, silicon carbide reacts with some elements (such as nickel, chromium, etc.) in the alloy to form high-hardness carbides (such as Cr3C2, Ni3C, etc.), which are dispersedly distributed in the alloy matrix, like "dispersion strengthening phase", to hinder the dislocation movement, so that the hardness of the alloy is significantly improved. In addition, high-temperature smelting also makes the alloy structure further uniform, eliminates the possible local non-uniformity in the first smelting and ball milling process, and improves the corrosion resistance of the alloy.

[0028] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0029] In the present application, "some embodiments", "the present embodiment" and examples are described, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subset of all possible embodiments, and can be combined with each other without conflict.

[0030] If the application file contains similar descriptions of "first / second", the following description is added, in the following description, the terms "first\second\third" are only used to distinguish similar objects, and do not represent the specific order of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence as allowed, so that the embodiments described herein can be implemented in an order other than that described herein.

[0031] The term "and / or" in this embodiment is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, object A and / or object B, which can represent three cases: object A exists alone, object A and object B exist together, and object B exists alone.

[0032] Embodiment 1

[0033] The embodiment provides a kind of corrosion-resistant alloy powder, including nickel alloy base material, aluminum nitride and silicon carbide;The aluminum nitride is 10% of the mass of the nickel alloy base material, and the silicon carbide is 10% of the mass of the nickel alloy base material;The mass percentage of the nickel alloy base material is: 45wt% of Ni, 7wt% of Mg, 1wt% of Zn, 7wt% of Mn, 0.8wt% of Ce, and the balance is Cu.

[0034] The embodiment provides a kind of corrosion-resistant alloy powder, including nickel alloy base material, aluminum nitride and silicon carbide;The aluminum nitride is 10% of the mass of the nickel alloy base material, and the silicon carbide is 10% of the mass of the nickel alloy base material;The mass percentage of the nickel alloy base material is: 45wt% of Ni, 7wt% of Mg, 1wt% of Zn, 7wt% of Mn, 0.8wt% of Ce, and the balance is Cu.

[0035] S1, according to the allocation ratio of each component, nickel-based alloy base material, aluminum nitride is mixed, then first ball milling, then first smelting, then first atomization powder is prepared in argon atmosphere to obtain modified nickel-based alloy powder;The rotation speed of the first ball milling is 300 rpm, and the ball milling time is 1.5 h;The first smelting is vacuum smelting, and the temperature of the first smelting is 1400 DEG C, and the vacuum degree is less than 1.0 × 10 -2 Pa, the smelting time is 1h;The pressure of the first atomization powder is 2.5 MPa;

[0036] S2, the modified nickel-based alloy powder and silicon carbide are mixed, then second ball milling is carried out, then second smelting is carried out, then second atomization powder is prepared to obtain the corrosion-resistant alloy powder;The second smelting is vacuum smelting, and the temperature of the second smelting is 1700 DEG C, and the vacuum degree is less than 1.0 × 10 -2 Pa, the smelting time is 0.5h;The rotation speed of the second ball milling is 300 rpm, and the second ball milling time is 2h;The pressure of the second atomization powder is 3 MPa.

[0037] Embodiment 2

[0038] The embodiment provides a kind of corrosion-resistant alloy powder, including nickel alloy base material, aluminum nitride and silicon carbide;The aluminum nitride is 10% of the mass of the nickel alloy base material, and the silicon carbide is 10% of the mass of the nickel alloy base material;The mass percentage of the nickel alloy base material is: 45wt% of Ni, 7wt% of Mg, 1wt% of Zn, 7wt% of Mn, 0.8wt% of Ce, and the balance is Cu.

[0039] The embodiment provides a preparation method of the corrosion-resistant alloy powder, and the method comprises the following steps:

[0040] S1, according to the allocation ratio of each component, the nickel-based alloy substrate and aluminum nitride are mixed, then first ball milling is performed, then first smelting is performed, and then first atomization powdering is performed under an argon atmosphere to obtain a modified nickel-based alloy powder; the rotating speed of the first ball milling is 200 rpm, and the ball milling time is 3h; the first smelting is vacuum smelting, the temperature of the first smelting is 1500 DEG C, the vacuum degree is < 1.0 * 10 -2 Pa, and the smelting time is 0.5h; the pressure of the first atomization powdering is 2.5 MPa;

[0041] S2, the modified nickel-based alloy powder and silicon carbide are mixed, then second ball milling is performed, then second smelting is performed, and then second atomization powdering is performed to obtain the corrosion-resistant alloy powder; the second smelting is vacuum smelting, the temperature of the second smelting is 1600 DEG C, the vacuum degree is < 1.0 * 10 -2 Pa, the rotating speed of the second ball milling is 300 rpm, the ball milling time is 2h, and the pressure of the second atomization powdering is 3 MPa.

[0042] Embodiment 3

[0043] The embodiment provides a corrosion-resistant alloy powder, which comprises a nickel alloy substrate, aluminum nitride and silicon carbide; the aluminum nitride accounts for 12% of the mass of the nickel alloy substrate, and the silicon carbide accounts for 6% of the mass of the nickel alloy substrate; the mass percentage of the nickel alloy substrate comprises 47wt% of Ni, 4wt% of Mg, 3wt% of Zn, 6wt% of Mn, 0.6wt% of Ce, and the balance is Cu.

[0044] The embodiment provides a preparation method of the corrosion-resistant alloy powder, and the method comprises the following steps:

[0045] S1, according to the allocation ratio of each component, the nickel-based alloy substrate and aluminum nitride are mixed, then first ball milling is performed, then first smelting is performed, and then first atomization powdering is performed under an argon atmosphere to obtain a modified nickel-based alloy powder; the rotating speed of the first ball milling is 200 rpm, and the ball milling time is 3h; the first smelting is vacuum smelting, the temperature of the first smelting is 1500 DEG C, the vacuum degree is < 1.0 * 10 -2 Pa, and the smelting time is 0.5h; the pressure of the first atomization powdering is 2.5 MPa;

[0046] S2, mixing the modified nickel-based alloy powder and silicon carbide, then performing second ball milling, then performing second melting, then performing second atomization to obtain the corrosion-resistant alloy powder; the second melting is vacuum melting, the temperature of the second melting is 1600℃, the vacuum degree is <1.0x10 -2 Pa, the melting time is 1h; the rotation speed of the second ball milling is 400rpm, the second ball milling time is 1h; the pressure of the second atomization is 3.5MPa.

[0047] Example 4

[0048] The embodiment provides a corrosion-resistant alloy powder, which comprises a nickel alloy substrate, aluminum nitride and silicon carbide; the aluminum nitride is 11% of the mass of the nickel alloy substrate, and the silicon carbide is 8% of the mass of the nickel alloy substrate; the mass percentage of the nickel alloy substrate is composed of 50wt% of Ni, 3wt% of Mg, 2.5wt% of Zn, 5wt% of Mn, 1wt% of Ce, and the balance of Cu.

[0049] The embodiment provides a preparation method of the corrosion-resistant alloy powder, and the preparation method comprises the following steps:

[0050] S1, mixing a nickel-based alloy substrate and aluminum nitride according to the allocation ratio of each component, then performing first ball milling, then performing first melting, and then performing first atomization in an argon atmosphere to obtain a modified nickel-based alloy powder; the rotation speed of the first ball milling is 400rpm, and the ball milling time is 2.5h; the first melting is vacuum melting, the temperature of the first melting is 1400℃, the vacuum degree is <1.0x10 -2 Pa, and the melting time is 1h; the pressure of the first atomization is 3MPa;

[0051] S2, mixing the modified nickel-based alloy powder and silicon carbide, then performing second ball milling, then performing second melting, then performing second atomization to obtain the corrosion-resistant alloy powder; the second melting is vacuum melting, the temperature of the second melting is 1600℃, the vacuum degree is <1.0x10 -2 Pa, the melting time is 1h; the rotation speed of the second ball milling is 400rpm, the second ball milling time is 1h; the pressure of the second atomization is 3.5MPa.

[0052] Comparative Example 1

[0053] The difference between the present comparative example and Example 1 is that no aluminum nitride and silicon carbide are added. The present comparative example provides a corrosion-resistant alloy powder comprising a nickel alloy base material; the nickel alloy base material has a mass percentage composition of 45wt% of Ni, 7wt% of Mg, 1wt% of Zn, 7wt% of Mn, 0.8wt% of Ce, and the balance of Cu.

[0054] The present comparative example provides a preparation method of the above-mentioned corrosion-resistant alloy powder, comprising the following steps:

[0055] S1, according to the allocation ratio of each component, the nickel-based alloy base material is subjected to first ball milling, then subjected to first smelting, and then subjected to first atomization powdering under an argon atmosphere to obtain a nickel-based alloy powder; the rotation speed of the first ball milling is 300 rpm, and the ball milling time is 1.5 h; the first smelting is vacuum smelting, the temperature of the first smelting is 1400℃, the vacuum degree is <1.0x10 -2 Pa, and the smelting time is 1 h; the pressure of the first atomization powdering is 2.5 MPa;

[0056] S2, the nickel-based alloy powder is subjected to second ball milling, then subjected to second smelting, and then subjected to second atomization powdering to obtain the corrosion-resistant alloy powder; the second smelting is vacuum smelting, the temperature of the second smelting is 1700℃, the vacuum degree is <1.0x10 -2 Pa, and the smelting time is 0.5 h; the rotation speed of the second ball milling is 300 rpm, the ball milling time of the second ball milling is 2 h; and the pressure of the second atomization powdering is 3 MPa.

[0057] Comparative Example 2

[0058] The difference between the present comparative example and Example 1 is that no silicon carbide is added, and an equal amount of aluminum nitride is used to replace the silicon carbide.

[0059] The present example provides a corrosion-resistant alloy powder comprising a nickel alloy base material and aluminum nitride; the aluminum nitride is 20% of the mass of the nickel alloy base material; the nickel alloy base material has a mass percentage composition of 45wt% of Ni, 7wt% of Mg, 1wt% of Zn, 7wt% of Mn, 0.8wt% of Ce, and the balance of Cu.

[0060] The present comparative example provides a preparation method of the above-mentioned corrosion-resistant alloy powder, comprising the following steps:

[0061] S1, according to the distribution ratio of each component, the nickel-based alloy substrate, aluminum nitride is mixed, then the first ball milling, then the first smelting, then the first atomization powder is prepared under the atmosphere of argon to obtain the modified nickel-based alloy powder; the rotation speed of the first ball milling is 300 rpm, the ball milling time is 1.5 h; the first smelting is vacuum smelting, the temperature of the first smelting is 1400℃, the vacuum degree is <1.0*10 -2 Pa, the smelting time is 1h; the pressure of the first atomization powder is 2.5MPa;

[0062] S2, the modified nickel-based alloy powder is subjected to second ball milling, then second smelting, then second atomization powder is prepared to obtain the corrosion-resistant alloy powder; the second smelting is vacuum smelting, the temperature of the second smelting is 1700℃, the vacuum degree is <1.0*10 -2 Pa, the smelting time is 0.5h; the rotation speed of the second ball milling is 300 rpm, the time of the second ball milling is 2h; the pressure of the second atomization powder is 3MPa.

[0063] Comparative Example 3

[0064] The difference between this comparative example and Example 1 is that no aluminum nitride is added, and an equal amount of silicon carbide is used to replace the aluminum nitride.

[0065] This example provides a corrosion-resistant alloy powder, which comprises a nickel alloy substrate and silicon carbide; the silicon carbide is 20% of the mass of the nickel alloy substrate; the mass percentage composition of the nickel alloy substrate is: 45wt% of Ni, 7wt% of Mg, 1wt% of Zn, 7wt% of Mn, 0.8wt% of Ce, and the balance is Cu.

[0066] This comparative example provides a preparation method of the above-mentioned corrosion-resistant alloy powder, comprising the following steps:

[0067] S1, according to the distribution ratio of each component, the nickel-based alloy substrate, aluminum nitride is mixed, then the first ball milling, then the first smelting, then the first atomization powder is prepared under the atmosphere of argon to obtain the modified nickel-based alloy powder; the rotation speed of the first ball milling is 300 rpm, the ball milling time is 1.5 h; the first smelting is vacuum smelting, the temperature of the first smelting is 1400℃, the vacuum degree is <1.0*10 -2 Pa, the smelting time is 1h; the pressure of the first atomization powder is 2.5MPa;

[0068] S2, mixing the nickel-based alloy powder and silicon carbide, then performing second ball milling, then performing second melting, then performing second atomization to obtain the corrosion-resistant alloy powder; the second melting is vacuum melting, the temperature of the second melting is 1700℃, the vacuum degree is <1.0x10 -2 Pa, the melting time is 0.5h; the rotation speed of the second ball milling is 300rpm, the second ball milling time is 2h; the pressure of the second atomization is 3MPa.

[0069] Comparative Example 4

[0070] The difference between the present comparative example and Example 1 is that the aluminum nitride and silicon carbide are added synchronously.

[0071] The present comparative example provides a corrosion-resistant alloy powder comprising a nickel alloy substrate, aluminum nitride and silicon carbide; the aluminum nitride is 10% of the mass of the nickel alloy substrate, and the silicon carbide is 10% of the mass of the nickel alloy substrate; the mass percentage of the nickel alloy substrate is composed of 45wt% of Ni, 7wt% of Mg, 1wt% of Zn, 7wt% of Mn, 0.8wt% of Ce, and the balance of Cu.

[0072] The present comparative example provides a preparation method of the above-mentioned corrosion-resistant alloy powder, comprising the following steps:

[0073] S1, according to the component ratio, mixing the nickel-based alloy substrate, aluminum nitride and silicon nitride, then performing first ball milling, then performing first melting, then performing first atomization under argon atmosphere to obtain a modified nickel-based alloy powder; the rotation speed of the first ball milling is 300rpm, and the ball milling time is 1.5h; the first melting is vacuum melting, the temperature of the first melting is 1400℃, and the vacuum degree is <1.0x10 -2 Pa, the melting time is 1h; the pressure of the first atomization is 2.5MPa;

[0074] S2, mixing the modified nickel-based alloy powder and performing second ball milling, then performing second melting, then performing second atomization to obtain the corrosion-resistant alloy powder; the second melting is vacuum melting, the temperature of the second melting is 1700℃, the vacuum degree is <1.0x10 -2 Pa, the melting time is 0.5h; the rotation speed of the second ball milling is 300rpm, the second ball milling time is 2h; the pressure of the second atomization is 3MPa.

[0075] The powders obtained in the examples and comparative examples were dried in a vacuum drying oven at 120℃ for 5 hours, a 45 steel with a size of 5150mmx150mmx30mm was used as a substrate, the substrate was preheated to 500℃, laser additive manufacturing was carried out, the laser power was 1600W, the powder feeding rate was 12g / min, the protective gas argon flow rate was 18L / min, and then heat treatment (1320℃ / 1.5hAC+800℃ / 4hFC+650℃ / 6hAC) was carried out on it, finally the printed parts corresponding to the examples and comparative examples were obtained, and performance test was carried out on the printed parts.

[0076] Corrosion resistance: according to the provisions of GB / T 10125-1997, the average corrosion rate was measured after 8h in a salt spray formed by a 5wt% NaCl solution and 16h of storage, the corrosion resistance of the alloy was investigated, and the results are shown in Table 1.

[0077] As can be seen from Table 1, the corrosion-resistant alloy powder proposed in the present application has excellent corrosion resistance, and the powders of comparative examples 1-4 have poor corrosion resistance.

[0078] Table 1

[0079] Corrosion resistance rate (mm / a) Example 1 0.005 Example 2 0.009 Example 3 0.006 Example 4 0.01 Comparative Example 1 0.3 Comparative Example 2 0.18 Comparative Example 3 0.25 Comparative Example 4 0.14

[0080] Microhardness: the printed parts were measured for microhardness by using a Vickers microhardness tester (model HVS-50 Vickers microhardness tester). The experimental parameters were: loading load 600g, holding time 20s, 3 points on the same horizontal plane of the same point were selected for measurement, and the microhardness of each horizontal position was the average value of three points. The test results are shown in Table 2.

[0081] Table 2

[0082] Microhardness (HV) Example 1 812 Example 2 805 Example 3 807 Example 4 802 Comparative Example 1 653 Comparative Example 2 681 Comparative Example 3 668 Comparative Example 4 712

[0083] As can be seen from Table 2, the microhardness of the alloy powders of examples 1-4 is as high as 800HV or more, which is significantly higher than that of comparative examples 1-4.

[0084] The specific embodiments of the application described above do not constitute a limitation on the scope of protection of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the scope of protection of the claims of the present application.

Claims

1. A method for preparing corrosion-resistant alloy powder, characterized in that, Includes the following steps: S1. According to the proportions of each group, the nickel-based alloy substrate and aluminum nitride are mixed, followed by a first ball milling, a first melting, and a first atomization powdering to obtain modified nickel-based alloy powder; the first melting is vacuum melting, the temperature of the first melting is 1400-1500℃, and the vacuum degree is <1.0×10⁻⁶. -2 Pa, the melting time is 0.5-1h; S2. The modified nickel-based alloy powder and silicon carbide are mixed, followed by a second ball milling, a second melting, and a second atomization powdering to obtain the corrosion-resistant alloy powder; the second melting is vacuum melting, the temperature of the second melting is 1600-1700℃, and the vacuum degree is <1.0×10⁻⁶. -2 Pa, the melting time is 0.5-1h; The corrosion-resistant alloy powder comprises a nickel alloy substrate, aluminum nitride, and silicon carbide; the aluminum nitride accounts for 10-15% of the mass of the nickel alloy substrate, and the silicon carbide accounts for 5-10% of the mass of the nickel alloy substrate; the nickel alloy substrate has the following composition by mass percentage: 45-50 wt% Ni, 3-7 wt% Mg, 1-3 wt% Zn, 4-7 wt% Mn, 0.5-1.0 wt% Ce, and the balance is Cu.

2. The method for preparing corrosion-resistant alloy powder according to claim 1, characterized in that, In step S1, the rotation speed of the first ball mill is 200-400 rpm, and the ball milling time is 1-3 hours.

3. The method for preparing corrosion-resistant alloy powder according to claim 1, characterized in that, In step S1, the pressure of the first atomization powder production is 2.5-3 MPa.

4. The method for preparing corrosion-resistant alloy powder according to claim 1, characterized in that, In step S2, the rotation speed of the second ball mill is 300-400 rpm.

5. The method for preparing corrosion-resistant alloy powder according to claim 4, characterized in that, In step S2, the second ball milling time is 1-2 hours.

6. The method for preparing corrosion-resistant alloy powder according to claim 1, characterized in that, In step S2, the pressure of the second atomization powdering is 3-3.5 MPa.