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Method for preparing superfine 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: 2021-07-20
CENT SOUTH UNIV
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  • Abstract
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  • 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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  • Method for preparing superfine high-purity high-solid-solubility tungsten-based alloy powder
  • Method for preparing superfine high-purity high-solid-solubility tungsten-based alloy powder
  • Method for preparing superfine high-purity high-solid-solubility tungsten-based alloy powder

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Experimental program
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Effect test

Embodiment 1

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

Embodiment 2

[0048] Get auxiliary material niobium powder 60g (average particle diameter 40 μ m, purity ≥ 99.9%), raw material tungsten powder 240g (average particle diameter 4 μ m, purity ≥ 99.95%), carry out two-step ball milling in the same manner with embodiment 1, second step ball milling time for 35h. Heat treatment temperature 800 ℃, other conditions are with embodiment 1, make tungsten-niobium alloy powder such as image 3 , the particle size distribution see 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 powder analyzed by ICP-OES and carbon hydrogen oxygen tester is shown in Table 4.

Embodiment 3

[0050] Get auxiliary material niobium powder 60g (average particle diameter 40 μm, purity ≥ 99.9%), auxiliary material tantalum powder 60g (average particle diameter 27 μm, purity ≥ 99.95%), raw material tungsten powder 180g (average particle diameter 4 μ m, purity ≥ 99.95%), with In the same manner as in Example 1, first add auxiliary materials tantalum powder and niobium powder for the first step of ball milling, then add tungsten powder for the second step of ball milling, the second step of ball milling time is 50h, the heat treatment temperature is 820°C, and other conditions are the same as in Example 1 , to obtain tungsten-tantalum-niobium alloy powder. The solid solution effect was analyzed by XRD as Figure 5 It can be seen from the figure that only the main peak of tungsten exists in the alloy powder, indicating that niobium and tantalum have been dissolved into the crystal lattice of tungsten to achieve alloying. The average particle diameter of the obtained powder...

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Abstract

The invention belongs to the field of material preparation, and particularly relates to a method for preparing superfine high-purity high-solid-solubility tungsten-based alloy powder. According to the method, the content of adsorbed oxygen is reduced by combining multi-stage high-energy ball milling with a reduction heat treatment process, the introduction amount of solid solution elements is increased, a dislocation slippage mechanism of pure tungsten is effectively improved, tungsten particles are toughened, and the problem of low solid solubility of a traditional powder preparation method is solved. In the first stage, auxiliary materials are subjected to low-speed ball milling; and then prepared tungsten powder is added into ball milling equipment to be subjected to high-speed ball milling for a proper time, so that the problems of non-uniform particle size and impurity introduction of powder prepared through a traditional mechanical alloying method are effectively solved. The process is simple and controllable; and an obtained product is low in impurity content, narrow in particle size distribution, small in particle size and convenient for large-scale industrial application.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular 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 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00C22C27/04
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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