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An industrial in-situ synthesis method of W-based composite powder that can add WC strengthening phase

A composite powder, in-situ synthesis technology, used in the field of refractory metals and powder metallurgy

Active Publication Date: 2020-11-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the technical problems in the production and application of W-based composite powder materials at present, and provides an industrialized in-situ synthesis method of W-based composite powder materials that can add WC strengthening phase

Method used

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  • An industrial in-situ synthesis method of W-based composite powder that can add WC strengthening phase
  • An industrial in-situ synthesis method of W-based composite powder that can add WC strengthening phase
  • An industrial in-situ synthesis method of W-based composite powder that can add WC strengthening phase

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Experimental program
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Effect test

Embodiment 1

[0024] First, weigh 370 grams of WC and mix them with absolute ethanol, and perform ball milling. The mass ratio of balls to powder is 10:1, the speed of the ball mill is 2000r / min, and the milling time is 65h; weigh 129 grams of WO 3 Mix with absolute ethanol, and perform ball milling, the mass ratio of balls to powder is 5:1, the speed of the ball mill is 520r / min, and the ball milling time is 50h. Then ball milled WC, WO 3The powder is mixed by ball milling twice, the mass ratio of balls to powder is 3:1, the volume ratio of absolute ethanol to material is 1:1, the rotational speed of the ball mill is 200r / min, and the ball milling time is 20 hours. After that, put the above powder in a drying oven for drying treatment, and then put it in a vacuum furnace for reaction. The vacuum degree is 10 Pa, and the temperature is raised to 950 ° C for 3 hours to prepare a composite powder with WC evenly distributed on the W matrix. The mass ratio of WC is 10wt.%. In this embodiment,...

Embodiment 2

[0026] First take 375 grams of WC and mix them with absolute ethanol, and carry out ball milling, the mass ratio of balls and powder is 10:1, the rotating speed of ball mill is 2000r / min, and the ball milling time is 65h; It is 150-200nm, so the CuO raw material is not pretreated by ball milling. Afterwards, CuO and WC after ball milling were mixed by secondary ball milling. The mass ratio of balls to powder was 3:1, the volume ratio of absolute ethanol to material was 1:1, the speed of ball mill was 320r / min, and the ball milling time was 30 hours. Afterwards, the above-mentioned powder was placed in a drying oven for drying treatment, and then placed in a tube furnace for reaction. The argon protective atmosphere was used, and the flow rate was 1L / min. The temperature was raised to 850°C and kept for 3h, and the W25Cu matrix was prepared. Composite powder, wherein the mass ratio of WC is 15wt.%. In this embodiment, the microscopic appearance of the raw material powder and t...

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Abstract

The invention discloses an industrial in-situ synthesis method capable of adding W based composite powder with a WC strengthening phase, and belongs to the technical field of refractory metal and powder metallurgy. The industrial in-situ synthesis method comprises the following steps of: taking oxygen-containing metal oxides such as tungsten oxide, copper oxide and copper tungstate as well as tungsten carbide powder as raw materials, refining the metal oxides and tungsten carbide powder particles through a step-by-step ball-milling process, improving reaction activity, ball-milling and mixingproportioned powder at low rotation speed; and putting mixed powder under a vacuum or inert-gas protective condition to perform in-situ reaction. According to the industrial in-situ synthesis method disclosed by the invention, in-situ reaction generates certain amount of a matrix phase through proportioning design, and the WC phase is uniformly distributed into matrix of the generated phase in a process of generating the matrix phase through in-situ reaction according to design of raw materials. And the grain size of un-reacted powder is controlled and temperature and time in a reaction process are controlled, so that control on the average grain size and grain size distribution of the W based composite powder can be realized.

Description

technical field [0001] The invention relates to an industrialized in-situ synthesis method for rapidly preparing W-based composite powder that can be strengthened by adding WC. The powder material systems that can be prepared include: W, W-WC, W-Cu, W-Cu-WC, etc., which belong to Refractory metals and powder metallurgy technology field. Background technique [0002] Tungsten is widely used in industrial fields because of its high melting point, low thermal expansion coefficient, excellent mechanical properties, and good corrosion resistance. In addition, tungsten is also a very important high-temperature application material because of its excellent properties such as high resistance to neutron radiation and low sputtering rate. Composite materials based on tungsten, such as: W-Ni-Fe high specific gravity alloy, W-Cu refractory / non-ferrous alloy, etc., have become indispensable and important materials in high-tech fields, such as used in microelectronics industry, fine chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/20
CPCB22F9/20
Inventor 宋晓艳李昱嵘王海滨侯超聂祚仁
Owner BEIJING UNIV OF TECH
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