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A method for preparing ultrafine, high-purity, high-solid-solubility tungsten-based alloy powder

A tungsten-based alloy, high-solid technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of uneven particle size, low solid solubility, high impurity introduction, etc., to solve the problem of low solid solubility, promote Homogenize and improve the effect of comprehensive mechanical properties

Active Publication Date: 2022-07-26
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing ultra-fine high-purity high-solid-solubility tungsten-based alloy powder in view of the deficiencies of existing methods, and adopt multi-stage high-energy ball milling to effectively improve the traditional mechanical alloying method for powder production The problem of uneven particle size and impurity, combined with the reduction heat treatment process to reduce the content of adsorbed oxygen, increased the introduction of solid solution elements, effectively improved the dislocation slip mechanism of pure tungsten and toughened tungsten particles, and solved the problem of low solid content of traditional powder making methods. Solubility, high impurity and other issues

Method used

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  • A method for preparing ultrafine, high-purity, high-solid-solubility tungsten-based alloy powder
  • A method for preparing ultrafine, high-purity, high-solid-solubility tungsten-based alloy powder
  • A method for preparing ultrafine, high-purity, high-solid-solubility tungsten-based alloy powder

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Take 60 g of auxiliary tantalum powder with an average particle size of 27 μm and a purity of ≥99.95%, and put it in a 1L ball milling jar of cemented carbide containing 0.4L of absolute ethanol. Add 2kg of cemented carbide balls with a diameter of 6mm and 1kg of cemented carbide balls with a diameter of 10mm. The cemented carbide grade is YG8 and the composition is WC-8Co. After encapsulating the ball mill jar, evacuate it to 133 Pa through a vacuum valve, then fill it with high-purity argon, and repeat 4 times. Install the ball mill jar on the omnidirectional planetary ball mill, add the counterweight at the corresponding position to balance the ball mill, set the rotation speed to 150rpm, stop for 5min every 1h, change the forward and reverse directions once, and start the omnidirectional reverse for 4 weeks at the same time. Second-rate. The ball milling time is 8h, so that a layer of ductile auxiliary material coating layer is formed on the surface of the ball mil...

Embodiment 2

[0048] Take 60g of auxiliary niobium powder (average particle size 40μm, purity ≥99.9%), raw material tungsten powder 240g (average particle size 4μm, purity ≥99.95%), carry out two-step ball milling in the same way as in Example 1, and the second step ball milling time for 35h. The heat treatment temperature is 800 ° C, and other conditions are the same as in Example 1, and the tungsten-niobium alloy powder is obtained as follows image 3 , see the particle size distribution Figure 4 . The average particle diameter of the obtained powder was 3.37 μm. (The span of powder particle size is less than or equal to 8 microns). The impurity content of the powder analyzed by ICP-OES and carbon, hydrogen and oxygen tester is shown in Table 4.

Embodiment 3

[0050] Take 60g of auxiliary niobium powder (average particle size 40μm, purity ≥99.9%), 60g auxiliary tantalum powder (average particle size 27μm, purity ≥99.95%), and raw tungsten powder 180g (average particle size 4μm, purity ≥99.95%), In the same way as in Example 1, firstly add the auxiliary materials tantalum powder and niobium powder to carry out the first ball milling, then add tungsten powder to carry out the second stage ball milling. , to obtain tungsten-tantalum-niobium alloy powder. The solid solution effect was analyzed by XRD as Figure 5 As can be seen from the figure, the alloy powder only has the main peak of tungsten, indicating that niobium and tantalum have been solid-dissolved into the lattice of tungsten to achieve alloying. The average particle diameter of the obtained powder was 4.8 μm. (The span of powder particle size is less than or equal to 12 microns). The analysis of its powder impurity content is shown in Table 1.

[0051] Table 1: Main elem...

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Abstract

The invention belongs to the field of material preparation, and particularly relates to a method for preparing ultrafine, high-purity and high-solid-solubility tungsten-based alloy powder. The invention adopts multi-stage high-energy ball milling combined with reduction heat treatment process to reduce the content of adsorbed oxygen, increase the introduction amount of solid solution elements, effectively improve the dislocation slip mechanism of pure tungsten, toughen tungsten particles, and solve the problem of low solid solubility in traditional powder milling methods. question. In the present invention, the first stage of low-speed ball milling of auxiliary materials; then, the prepared tungsten powder is added to the ball-milling equipment for a suitable period of high-speed ball milling, which effectively improves the problems of uneven particle size and impurities in the traditional mechanical alloying method. The process of the invention is simple and controllable; the obtained product has low impurity content, narrow particle size distribution and small particle size, and is convenient for large-scale industrial application.

Description

technical field [0001] The invention belongs to the field of material preparation, and particularly relates to a method for preparing ultrafine, high-purity and high-solid-solubility tungsten-based alloy powder. Background technique [0002] Tungsten is a metal with high density and high melting point. It has the advantages of high wear resistance, low evaporation rate and stable chemical properties. These special properties make tungsten widely used in defense weapons, industrial production and other fields. However, pure tungsten and most tungsten alloys are brittle at room temperature, and their ductile-brittle transition temperature (DBTT) is as high as 400-600 °C, which poses severe challenges to their processing and application properties. The brittleness of tungsten mainly comes from two aspects: first, the dislocation structure and slip mode of tungsten are the main reasons for the brittleness of tungsten. The plastic deformation of tungsten depends on the slip of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/142C22C27/04
CPCB22F9/04C22C27/04B22F2009/043B22F1/142
Inventor 刘文胜张勇黄宇峰梁超平马运柱蔡青山王垚刘嘉仪
Owner CENT SOUTH UNIV
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