High-specific-gravity tungsten-based alloy formation method based on pre-alloyed powder

A technology of pre-alloyed powder and tungsten-based alloy, which is applied in the forming field of high-specific gravity tungsten-based alloy, can solve the problems of limited size and complexity of forming samples, difficulty in adapting to industrial production, and complex process, and can meet the requirements of additive manufacturing process. , The effect of reducing the difficulty of forming and improving the bonding force

Active Publication Date: 2019-10-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned new process provides a new way to improve the performance of materials and develop new alloys, the equipment is expensive and the process is complicated. The size and complexity of the formed samples are still limited to a certain extent, and it is difficult to adapt to industrial production. press-sintering method

Method used

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  • High-specific-gravity tungsten-based alloy formation method based on pre-alloyed powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1. Preparation of pre-alloyed powder: W-Ni-Fe tungsten-based alloy is formulated according to the mass ratio of W, Ni and Fe of 90:7:3, and then the green body is obtained by pressing, and the green body is vacuum sintered in turn, The W-Ni-Fe tungsten-based alloy bar is obtained by forging, and the W-Ni-Fe tungsten-based alloy bar is placed in the plasma rotating electrode powder making equipment, and the W-Ni-Fe preform is prepared by the plasma rotating electrode powder making method. Alloy powder; the W-Ni-Fe pre-alloyed powder is a spherical body in which the solid solution phase formed by Ni and Fe wraps tungsten powder particles, and the particle size of the W-Ni-Fe pre-alloyed powder is less than 100 μm. The particle size of the tungsten powder particles in the alloy powder is 20 μm to 90 μm, and the thickness of the solid solution phase formed by Ni and Fe is 10 μm to 20 μm, such as figure 1 shown;

...

Embodiment 2

[0041] This embodiment includes the following steps:

[0042] Step 1. Preparation of pre-alloyed powder: W-Ni-Mn tungsten-based alloy is formulated according to the mass ratio of W, Ni, and Mn of 95:3:2, and then the green body is obtained by pressing, and the green body is vacuum sintered, The W-Ni-Mn tungsten-based alloy bar is obtained by forging, and the W-Ni-Mn tungsten-based alloy bar is placed in the plasma rotating electrode powder making equipment, and the W-Ni-Mn preformed powder is prepared by the plasma rotating electrode powder making method. Alloy powder; the W-Ni-Mn pre-alloyed powder is a spherical body in which a solid solution phase of Ni and Mn wraps tungsten powder particles, and the particle size of the W-Ni-Mn pre-alloyed powder is less than 100 μm. The particle size of the tungsten powder particles of the alloy powder is 20 μm to 90 μm, and the thickness of the solid solution phase formed by Ni and Mn is 10 μm to 20 μm;

[0043] Step 2: Acquisition of s...

Embodiment 3

[0050] This embodiment includes the following steps:

[0051] Step 1. Preparation of pre-alloyed powder: W-Ni-Co tungsten-based alloy is formulated according to the mass ratio of W, Ni and Co of 93:4:3, and then pressed to obtain a green body, which is then vacuum sintered, The tungsten-based alloy bar is obtained by forging, and the tungsten-based alloy bar is placed in the plasma rotating electrode powder making equipment, and the W-Ni-Co pre-alloyed powder is prepared by using the plasma rotating electrode powder making method; the W-Ni-Co The pre-alloyed powder is a spherical body in which the solid solution phase formed by Ni and Co wraps tungsten powder particles. The particle size of the W-Ni-Co pre-alloyed powder is less than 100 μm, and the particle size of the tungsten powder particles of the W-Ni-Co pre-alloyed powder is 20 μm to 90 μm, the thickness of the solid solution phase formed by Ni and Co is 10 μm to 20 μm;

[0052] Step 2: Acquisition of slice data and sc...

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Abstract

The invention discloses a high-specific-gravity tungsten-based alloy formation method based on pre-alloyed powder. The high-specific-gravity tungsten-based alloy formation method based on the pre-alloyed powder comprises the steps that firstly, according to the designed ingredients and proportion of the high-specific-gravity tungsten-based alloy, material mixing, pressing, vacuum sintering and forging machining are sequentially conducted, then a tungsten-based alloy rod is obtained, and pre-alloyed powder is obtained through a plasma-rotating electrode powder manufacturing method; secondly, athree-dimensional model of the high-specific-gravity tungsten-based alloy is established, slicing and designing are conducted, and then slice layers and scanning data are obtained; thirdly, with the pre-alloyed powder as the raw material, according to the slice layers and the scanning data, a powder bed type electron beam additive manufacturing forming device is adopted to form the high-specific-gravity tungsten-based alloy. According to the high-specific-gravity tungsten-based alloy formation method based on the pre-alloyed powder, by utilizing the different melting points between tungsten and other elements in the high-specific-gravity tungsten-based alloy, the pre-alloyed powder with tungsten powder particles being wrapped inside low-melting-point element solid solution is prepared, sothat the shells of the pre-alloyed powder are easy to melt and adhere to one another for formation, and therefore the formation difficulty of the pre-alloyed powder is lowered; and with the pre-alloyed powder as the raw material, preparation of the high-specific-gravity tungsten-based alloy is achieved.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a forming method of a high specific gravity tungsten-based alloy based on pre-alloyed powder. Background technique [0002] The tungsten content of high specific gravity tungsten-based alloys is usually above 90%, and the density is usually 17g / cm 3 Above, it has a series of excellent properties such as high density, high strength and hardness, good electrical and thermal conductivity, small thermal expansion coefficient, good corrosion and oxidation resistance, good machinability and weldability, so in the field of modern science, national defense It has been widely used in both industrial and civil industries. For example, it is used as gyro rotor and inertial rotating element in aerospace industry; it is used as armor-piercing projectile, kinetic energy projectile and missile warhead in military industry; it is used as shielding material in medical an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00B33Y50/02C22C27/04
CPCB33Y10/00B33Y50/02C22C27/04B22F2998/10B22F10/00B22F10/28B22F10/366B22F10/32B22F10/80B22F9/14B22F2003/248Y02P10/25
Inventor 杨广宇刘楠贾文鹏杨坤贾亮汤慧萍王建
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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