High specific gravity tungsten alloy material and preparation method thereof

A tungsten alloy and high specific gravity technology, which is applied in the field of high specific gravity tungsten alloy materials and their preparation, can solve the problems of alloy materials such as limited deformation, tensile strength and elongation, coarse microstructure, and reduced plasticity, so as to improve extrusion process, preventing growth, and reducing production costs

Inactive Publication Date: 2015-01-28
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a high specific gravity tungsten alloy material and a preparation method thereof, which are used to solve technical defects such as coarse microstructure of tungsten alloy materials in the prior art, decrease in plasticity when strength increases, limited deformation, tensile strength and elongation of alloy materials, etc.

Method used

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  • High specific gravity tungsten alloy material and preparation method thereof
  • High specific gravity tungsten alloy material and preparation method thereof
  • High specific gravity tungsten alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. Ball milling modification of raw materials

[0048] Put the reduced tungsten powder into a high-energy stirring ball mill for ball milling. During the ball milling, high-purity argon with a purity of 99.99% is used as a protective gas, and 1wt% stearic acid is added as a ball milling process control agent. The ball material is GCr15 , its diameter is about 6mm, the ball-to-material ratio (mass ratio) is about 15:1, and the ball mill speed is controlled to be about 350rpm, the ball milling time is about 35h, and the modified tungsten powder (powder output) with an average size of submicron is obtained. rate is about 94.3%), and the scanning electron microscope results are as follows figure 1 shown. Depend on figure 1 It can be seen that the tungsten particles modified by ball milling have been significantly refined, and the shape of the particles tends to be "equiaxed". The size reaches about 14nm.

[0049] Carbonyl nickel powder and carbonyl iron powder are prepa...

Embodiment 2

[0061] 1. Ball milling modification of raw materials

[0062] Put the reduced tungsten powder into a high-energy stirring ball mill for ball milling. During the ball milling, high-purity argon is used as the protective gas. The ball material is GCr15, with a diameter of about 6mm and a ball-to-material ratio of about 10:1. The rotating speed is about 300rpm, the ball milling time is about 25h, and the modified tungsten powder (the powder yield is about 96.3%) is obtained, and the grain size reaches about 34nm.

[0063] The carbonyl nickel powder and carbonyl iron powder are prepared into a mixed powder according to the mass ratio of about 6:4, and then placed in a powder mixer to mix evenly, and then placed in a high-energy stirring ball mill for ball milling. High-purity argon is used for ball milling Gas is used as the protective gas, the ball material is GCr15, its diameter is about 6mm, the ball-to-material ratio is about 10:1, and the speed of the ball mill is controlled ...

Embodiment 3

[0073] 1. Ball milling modification of raw materials

[0074]Put the reduced tungsten powder into a high-energy stirring ball mill for ball milling. During the ball milling, high-purity argon is used as the protective gas. The ball material is GCr15, with a diameter of about 6mm and a ball-to-material ratio of about 15:1. The rotation speed is about 250rpm, and the ball milling time is about 20h, and the modified tungsten powder is prepared, and the grain size reaches about 117nm.

[0075] Carbonyl nickel powder and carbonyl iron powder are prepared into mixed powder according to the mass ratio of about 8:2, and then placed in a powder mixer to mix evenly, and then placed in a high-energy stirring ball mill for ball milling. High-purity argon is used for ball milling Gas is used as the protective gas, the ball material is GCr15, its diameter is about 6mm, the ball-to-material ratio is about 15:1, and the speed of the ball mill is controlled at about 250rpm, and the ball millin...

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Abstract

The invention provides a high specific gravity tungsten alloy material and a preparation method thereof. The preparation method comprises the following steps: 1) ball-milling tungsten powder to prepare modified tungsten powder; 2) ball-milling mixed nickel powder and iron powder to prepare a nanocrystalline ferronickel solid solution; 3) mixing the modified tungsten powder and the nanocrystalline ferronickel solid solution in a weight ratio of 93:7 and compressing to form a blank; 4) liquid sintering the blank to prepare a sintered blank with the relative density of 93.9-99.8%; 5) mixing superfine graphite powder and nano silicon dioxide powder in a weigh ratio of (60-90):(20-40) and ball-milling, and compressing till the relative density is 80-90% and preparing a lubricating medium; and 6) putting the sintered blank in the lubricating medium for thermal hydrostatic extrusion and carrying out thermal treatment on the sintered blank after thermal hydrostatic extrusion to prepare the high specific gravity tungsten alloy material. The strength of the high specific gravity tungsten alloy material prepared by the method is greatly improved while good ductility is still maintained.

Description

technical field [0001] The invention relates to a tungsten alloy material, in particular to a high specific gravity tungsten alloy material and a preparation method thereof. Background technique [0002] High specific gravity tungsten alloy is a kind of alloy composed of tungsten element as the base material (tungsten content is 80% ~ 97%), and an appropriate amount of Ni, Cu, Fe, Co, Mo, Cr and other elements are added. Tungsten is brittle and maintains excellent properties such as high melting point, high density, and low expansion coefficient of tungsten, so it has been widely used in aerospace, military, and civil industries. [0003] At present, the preparation of high specific gravity tungsten alloy is mainly through rotary forging after sintering. Although rotary forging can improve the strength of tungsten alloys, the plasticity is very poor; in addition, the deformation of rotary forging is very small, and it needs to be heated and forged many times to obtain a lar...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C27/04
Inventor 房文斌
Owner HARBIN INST OF TECH
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