Tungsten-rhenium solid alloy powder with nanocrystalline structure as well as preparation method and application of tungsten-rhenium solid alloy powder

A technology of alloy powder and nanocrystal, which is applied in the field of tungsten-rhenium solid alloy powder with nanocrystal structure and its preparation, can solve the problems affecting the performance of alloy powder, high powder activity, powder agglomeration, etc., and achieve improved grinding strength and density , the effect of reducing the sintering temperature

Active Publication Date: 2022-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through mechanical alloying, alloys with precise proportions can be obtained, and at the same time, it is easy to operate and easy to produce in large quantities. However, due to the high activity of the powder after mechanical alloying, oxidation and powder agglomeration are prone to occur, which affects the performance of alloy powders.

Method used

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  • Tungsten-rhenium solid alloy powder with nanocrystalline structure as well as preparation method and application of tungsten-rhenium solid alloy powder
  • Tungsten-rhenium solid alloy powder with nanocrystalline structure as well as preparation method and application of tungsten-rhenium solid alloy powder
  • Tungsten-rhenium solid alloy powder with nanocrystalline structure as well as preparation method and application of tungsten-rhenium solid alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A method for preparing low-agglomeration high-activity low-oxygen-content tungsten-rhenium solid-state alloy powder with nanocrystalline structure, comprising the following steps:

[0057] Step 1: Solid-state alloying of tungsten-rhenium powder by high-energy ball milling

[0058] Take 170g of tungsten powder with a purity of more than 99.95%; 30g of rhenium powder, the average particle size of tungsten powder is 3-5 microns, and the average particle size of rhenium powder is 5 microns; the mass ratio of tungsten powder:rhenium powder is 85:15. The prepared raw material powder is placed in the ball mill tank, the ball mill beads are cemented carbide beads, and the mass is 2000g; the ball mill medium is anhydrous ethanol, and the addition amount of anhydrous ethanol is 1 / 2 of the volume of the ball mill tank; the ball mill tank used It is a cemented carbide ball mill jar, the model is YN8, the volume is 1L, the inner layer of the tank is WC layer, and the hardness is 89H...

Embodiment 2

[0066] A method for preparing a low-aggregation, high-activity, low-oxygen-content tungsten-rhenium solid-state alloy powder with nanocrystalline structure. Other conditions are the same as in Example 1, except that the mass ratio of tungsten powder to rhenium powder is changed. The mass ratios of tungsten powder:rhenium powder are 1:99, 5:95 and 10:90 respectively.

[0067] The prepared powder was tested by X-ray automatic diffractometer (XRD, Advance D8). Figure 5 As shown, the tungsten-rhenium solid-state alloying powder prepared by this method can achieve complete solid-state alloying when the rhenium content is within 15 wt.%, and no peak of Re is observed in the XRD detection result. At the same time, no oxide peak was observed in the detection result, which proved that the powder was not oxidized.

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Abstract

The invention discloses tungsten-rhenium solid alloy powder of a nanocrystalline structure and a preparation method and application of the tungsten-rhenium solid alloy powder. Tungsten powder and rhenium powder are subjected to ball milling under the protective atmosphere to obtain alloy powder, the alloy powder is subjected to ultrasonic dispersion and drying under the protective atmosphere to obtain dispersed alloy powder, then the dispersed alloy powder is subjected to heat treatment under the reducing atmosphere, and the tungsten-rhenium solid alloy powder is obtained. In the ball milling process, clockwise rotation ball milling and anticlockwise rotation ball milling are alternately carried out, the duration time of any clockwise rotation ball milling or anticlockwise rotation ball milling is 4-6 min, rotation is stopped for 1-2 min during alternation, and the total ball milling time is 50-70 h. The tungsten-rhenium solid alloy powder prepared through the method has the characteristics of low agglomeration degree and low oxygen content, meanwhile, the high activity of the tungsten-rhenium alloy powder prepared through the method is guaranteed through a large number of nanocrystalline structures, and the problems that the tungsten-rhenium alloy powder is low in activity and the like can be effectively solved.

Description

technical field [0001] The invention belongs to the field of preparation of tungsten-based alloy powder, and particularly relates to a tungsten-rhenium solid alloy powder with nanocrystalline structure and a preparation method and application thereof. Background technique [0002] Pure tungsten (W) is considered as a plasma surface material (PFMs) in magnetic confinement fusion devices due to its excellent engineering properties, such as high melting point, high strength at high temperature, excellent thermal conductivity, low sputter yield rate and low thermal expansion coefficient. ) are the most promising candidates. At the same time, tungsten is also considered the best choice for shielding components in fusion power reactors and other systems involving nuclear fusion reactors. However, pure tungsten suffers from poor radiation stability, fracture toughness and low temperature brittleness, low ductility is associated with high ductility-to-brittle transition temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/145B22F1/142B22F1/14C22C27/04
CPCB22F9/04C22C27/04B22F2009/043Y02P10/25
Inventor 马运柱王垚黄宇峰刘文胜张勇刘嘉仪刘文扬黄哲
Owner CENT SOUTH UNIV
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