Tungsten alloy powder metallurgy preparation method

Abstract

The invention belongs to the technical field of tungsten alloy, and particularly discloses a tungsten alloy powder metallurgy preparation method, which comprises the following steps: mixing tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder, banburying and mixing the mixture with potassium carbonate, polyformaldehyde, D-mannuronic acid disaccharide, octadecanamide and rice bran wax, performing catalytic degreasing with nitric acid, and performing compression molding, thereby obtaining the tungsten alloy powder metallurgy material. And sintering to obtain the excellent tungsten alloy material with high ductility.

Description

Technical Field

[0001] The invention relates to the technical field of tungsten alloys, and in particular to a tungsten alloy powder metallurgy preparation method. Background Art

[0002] Tungsten alloy is widely used in aerospace, national defense science and technology, nuclear industry and other fields due to its high melting point, high density, high hardness and good corrosion resistance.

[0003] The ductility of tungsten alloy refers to the ability of the material to undergo plastic deformation without immediate fracture when subjected to external forces. The ductility of tungsten alloy is closely related to its composition, microstructure, preparation process, heat treatment and other factors. However, the ductility of tungsten alloy is usually low, which limits its application in products that require high ductility. Summary of the invention

[0004] The invention provides a tungsten alloy powder metallurgy preparation method having excellent ductility.

[0005] The present invention solves the technical problem by adopting the following technical solutions: A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Evenly mixing tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder to obtain a mixed powder; (2) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax to obtain a precursor powder; (3) The precursor powder is placed in a nitric acid solution for catalytic degreasing, compression molding, and sintering to obtain a tungsten alloy material.

[0006] The invention obtains a tungsten alloy with excellent ductility by mixing tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder, and then mixing the mixture with potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide and rice bran wax, and then catalytically degreasing with nitric acid, performing compression molding and sintering. The invention effectively improves the strength of the tungsten alloy by adding nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder, and plays an excellent strengthening effect, and simultaneously promotes the formation of multiple reinforcing phases, inhibits abnormal growth of grains, eliminates crystal defects of the alloy system during the sintering process and diffuses them into the pores, improves the density, and improves the integrity of the alloy phase structure and high-temperature oxidation resistance. The materials such as potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide and rice bran wax generate certain pores during the catalytic degreasing process, which is convenient for the green body to generate an expansion effect during the subsequent sintering process and increase sufficient diffusion space. On the other hand, the materials improve the wettability and bonding effect as well as the shape-keeping effect, and effectively improve the ductility of the tungsten alloy.

[0007] As a preferred embodiment of the present invention, the mass ratio of the tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder is (80-85): (8-12): (4-6): (0.5-1): (0.5-1).

[0008] As a preferred embodiment of the present invention, the preparation method of the alloy powder is: Mix titanium powder, zirconium powder, nickel oxide powder, lanthanum powder and cerium powder in a mass ratio of 1: (0.8-1.2): (0.4-0.8): (0.4-0.8): (0.2-0.6) by ball milling to obtain a mixture; The mixture is placed in a vacuum furnace and calcined to obtain alloy powder.

[0009] As a preferred embodiment of the present invention, the calcination temperature is 820-850° C., and the calcination time is 2-4 hours.

[0010] As a preferred embodiment of the present invention, the mass ratio of the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax is 100: (1.2~1.6): (0.8~1.2): (0.5~0.8): (0.3~0.6): (0.2~0.4).

[0011] As a preferred embodiment of the present invention, the molar concentration of the nitric acid solution is 5-10 mol / L.

[0012] As a preferred embodiment of the present invention, the mass ratio of the precursor powder to the nitric acid solution is 1:(2-5).

[0013] As a preferred embodiment of the present invention, the temperature of the catalytic degreasing is 65-80° C. and the time is 0.5-2 h.

[0014] As a preferred embodiment of the present invention, the sintering temperature is 1370-1400° C., and the sintering time is 2-4 hours.

[0015] As a preferred embodiment of the present invention, the banburying temperature is 220-260° C., and the banburying time is 1-4 hours.

[0016] As a preferred embodiment of the present invention, the compression molding pressure is 220-280 MPa, and the pressure holding molding time is 4-10 min.

[0017] The beneficial effects of the present invention are as follows: the present invention obtains a tungsten alloy with excellent ductility by mixing tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder, and then mixing the mixture with potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide and rice bran wax, and then catalytically degreasing with nitric acid, performing compression molding and sintering. The present invention effectively improves the strength of the tungsten alloy by adding nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder, and achieves an excellent strengthening effect, while promoting the formation of multiple reinforcing phases, inhibiting abnormal grain growth, eliminating crystal defects of the alloy system during the sintering process and diffusing them into the pores, thereby improving the density, and improving the integrity of the alloy phase structure and high-temperature oxidation resistance; potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide and rice bran wax generate certain pores during the catalytic degreasing process, which is convenient for the green body to produce an expansion effect during the subsequent sintering process, thereby increasing sufficient diffusion space, and on the other hand, improves the wettability and bonding effect as well as the shape retention effect, thereby effectively improving the ductility of the tungsten alloy. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the present invention, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0020] In the present invention, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0021] In the present invention, there is no particular limitation on the specific dispersion and stirring treatment methods.

[0022] The reagents or instruments used in the present invention without indicating the manufacturer are all conventional products that can be obtained commercially. The raw materials used in the comparative examples and the raw materials used in the parallel experiments of the embodiments are the same commercially available products unless otherwise specified.

[0023] Example 1 A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, lanthanum powder and cerium powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with ball mill at a speed of 100 rpm to obtain a mixture; place the mixture in a vacuum furnace and calcine it at 840°C for 3 h to obtain alloy powder.

[0024] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0025] Example 2 A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, lanthanum powder and cerium powder into a ball mill in a mass ratio of 1:0.8:0.8:0.8:0.2, and mix them evenly with ball mill at a speed of 100 rpm to obtain a mixture; and calcine the mixture at 840° C. in a vacuum furnace for 3 h to obtain an alloy powder.

[0026] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0027] Example 3 A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, lanthanum powder and cerium powder into a ball mill in a mass ratio of 1:1.2:0.4:0.4:0.6, and mix them evenly with ball mill at a speed of 100 rpm to obtain a mixture; place the mixture in a vacuum furnace and calcine it at 840°C for 3 h to obtain alloy powder.

[0028] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0029] Example 4 A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, lanthanum powder, and cerium powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with ball mill at a speed of 100 rpm to obtain a mixture; place the mixture in a tubular furnace, and calcine it at 840°C for 3 h in an oxygen atmosphere to obtain an alloy powder.

[0030] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 82.5:12:4:0.5:1, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0031] Example 5 A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, lanthanum powder and cerium powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with a ball mill at a speed of 100 rpm to obtain a mixture; and calcine the mixture at 840°C in a vacuum furnace for 3 h to obtain an alloy powder.

[0032] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 84.5, 8, 6, 1 and 0.5, and mixing them uniformly with a ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0033] Example 6 A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, lanthanum powder, and cerium powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with ball mill at a speed of 100 rpm to obtain a mixture; place the mixture in a tubular furnace, and calcine it at 840°C for 3 h in an oxygen atmosphere to obtain an alloy powder.

[0034] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.2:1.2:0.5:0.6:0.2 at 250° C. for 3 h to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0035] Example 7 A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, boron powder and carbon powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with a ball mill at a speed of 100 rpm to obtain a mixture; and calcine the mixture at 840°C in a vacuum furnace for 3 h to obtain an alloy powder.

[0036] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.6:0.8:0.8:0.3:0.4 at 250° C. for 3 h to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0037] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that no alloy powder is added in Comparative Example 1 (the amount of alloy powder is evenly mixed into tungsten powder), and the other aspects are the same.

[0038] A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, lanthanum powder and cerium powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with ball mill at a speed of 100 rpm to obtain a mixture; place the mixture in a vacuum furnace and calcine it at 840°C for 3 h to obtain alloy powder.

[0039] (2) adding tungsten powder, nickel powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 88.6:10:0.8:0.6, and mixing them uniformly with a ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0040] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the composition of the alloy powder is different, and the other aspects are the same.

[0041] A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, chromium powder, nickel oxide powder, manganese powder and carbon powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with a ball mill at a speed of 100 rpm to obtain a mixture; place the mixture in a vacuum furnace and calcine it at 840°C for 3 h to obtain an alloy powder.

[0042] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0043] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the composition of the alloy powder is different, and the other aspects are the same.

[0044] A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Titanium powder, cobalt powder, nickel oxide powder, copper powder, and aluminum powder were added into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and the mixture was evenly mixed by ball milling at a speed of 100 rpm to obtain a mixture; the mixture was calcined in a vacuum furnace at 840°C for 3 h to obtain an alloy powder.

[0045] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 h, heat treatment is performed at 200°C for 1 h, molding is performed at 250 MPa for 8 min, and finally sintering is performed at 1380°C for 3 h to obtain a tungsten alloy material.

[0046] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that Comparative Example 4 is not subjected to nitric acid catalytic degreasing treatment, and the other aspects are the same.

[0047] A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, boron powder and carbon powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with a ball mill at a speed of 100 rpm to obtain a mixture; and calcine the mixture at 840°C in a vacuum furnace for 3 h to obtain an alloy powder.

[0048] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100:1.5:1:0.6:0.5:0.3 at 250°C for 3 hours to obtain a precursor powder; (4) The precursor powder was heat treated at 200°C for 1 h, molded at 250 MPa for 8 min, and finally sintered at 1380°C for 3 h to obtain a tungsten alloy material.

[0049] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that potassium carbonate and polyoxymethylene are not added in Comparative Example 5, and the other contents are the same.

[0050] A tungsten alloy powder metallurgy preparation method comprises the following steps: (1) Add titanium powder, zirconium powder, nickel oxide powder, lanthanum powder and cerium powder into a ball mill in a mass ratio of 1:1:0.6:0.6:0.5, and mix them evenly with ball mill at a speed of 100 rpm to obtain a mixture; place the mixture in a vacuum furnace and calcine it at 840°C for 3 h to obtain alloy powder.

[0051] (2) adding tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder into a ball mill according to a mass ratio of 83.6:10:5:0.8:0.6, and mixing them uniformly with ball mill at a speed of 100 rpm to obtain a mixed powder; (3) kneading the mixed powder, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax at a mass ratio of 100: 0.6: 0.5: 0.3 at 250° C. for 3 h to obtain a precursor powder; (4) The precursor powder is placed in an 8 mol / L nitric acid solution with a mass ratio of the precursor powder to the nitric acid solution of 1:4; catalytic degreasing is performed at 75°C for 1 hour, molding is performed at 250 MPa for 8 minutes, and finally sintering is performed at 1380°C for 3 hours to obtain a tungsten alloy material.

[0052] Test Case The elongation after fracture was tested using the method of GB / T228-2010.

[0053] Table 1

[0054] It can be seen from Table 1 that the tungsten alloy prepared by the method described in the present invention has excellent ductility.

[0055] By comparing Example 1 with Comparative Examples 1 to 3, it can be seen that the alloy powder of the present invention can significantly improve ductility.

[0056] By comparing Example 1 with Comparative Examples 4-5, it can be seen that the present invention significantly improves ductility by catalyzing degreasing through nitric acid or adding potassium carbonate and polyoxymethylene.

[0057] Finally, it should be noted that the above embodiments are intended to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A tungsten alloy powder metallurgy preparation method, characterized in that: The following steps are involved: (1) Evenly mixing tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder to obtain a mixed powder; (2) kneading the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide, and rice bran wax to obtain a precursor powder; (3) The precursor powder is placed in a nitric acid solution for catalytic degreasing, compression molding, and sintering to obtain a tungsten alloy material.

2. The tungsten alloy powder metallurgy preparation method according to claim 1, characterized in that: The mass ratio of the tungsten powder, nickel powder, alloy powder, lanthanum oxide powder and cerium oxide powder is (80-95): (8-12): (4-6): (0.5-1): (0.5-1).

3. The tungsten alloy powder metallurgy preparation method according to claim 1, characterized in that: The preparation method of the alloy powder is: Mix titanium powder, zirconium powder, nickel oxide powder, lanthanum powder and cerium powder in a mass ratio of 1: (0.8-1.2): (0.4-0.8): (0.4-0.8): (0.2-0.6) by ball milling to obtain a mixture; The mixture is placed in a tube furnace and calcined in an oxygen atmosphere to obtain alloy powder.

4. The tungsten alloy powder metallurgy preparation method according to claim 3, characterized in that: The calcination temperature is 820-850° C., and the calcination time is 2-4 hours.

5. The tungsten alloy powder metallurgy preparation method according to claim 1, characterized in that: The mass ratio of the mixed powder, potassium carbonate, polyoxymethylene, D-mannuronic acid disaccharide, stearic acid amide and rice bran wax is 100: (1.2-1.6): (0.8-1.2): (0.5-0.8): (0.3-0.6): (0.2-0.4).

6. The tungsten alloy powder metallurgy preparation method according to claim 1, characterized in that: The molar concentration of the nitric acid solution is 5-10 mol / L.

7. The tungsten alloy powder metallurgy preparation method according to claim 1, characterized in that: The mass ratio of the precursor powder to the nitric acid solution is 1:(2-5).

8. The tungsten alloy powder metallurgy preparation method according to claim 1, characterized in that: The temperature of the catalytic degreasing is 65-80° C. and the time is 0.5-2 h.

9. The tungsten alloy powder metallurgy preparation method according to claim 1, characterized in that: The sintering temperature is 1370-1400° C., and the sintering time is 2-4 hours.

Images