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Low-temperature rapid preparing method for high-density nanocrystalline tungsten copper base block composite materials

A composite material and nanocrystalline technology, which is applied in the field of refractory metals and powder metallurgy, can solve problems such as no reports of tungsten-copper-based bulk composite materials, and achieve a wide range of applications, improved hardness and elastic modulus, and high wear resistance. sexual effect

Active Publication Date: 2019-06-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature search, nanoscale tungsten-copper composite powders have been prepared in previous studies, but there is no report on tungsten-copper-based bulk composites with high density and nanocrystalline structure

Method used

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  • Low-temperature rapid preparing method for high-density nanocrystalline tungsten copper base block composite materials
  • Low-temperature rapid preparing method for high-density nanocrystalline tungsten copper base block composite materials
  • Low-temperature rapid preparing method for high-density nanocrystalline tungsten copper base block composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 28.50g of tungsten powder, 1.50g of chromium powder and 0.378g of zirconium carbide powder, the mass ratio of cemented carbide grinding ball to powder is 20:1, the inert gas argon is used as the protective gas, the speed of the planetary ball mill is 550r / min, and the ball mill Carry out in stages, grind for 90 minutes and stop for 30 minutes, scrape the powder once every 12 hours, add 7.59g of copper powder after ball milling for 48 hours, the ball-to-material ratio is 5:1, the speed is 120r / min, add absolute ethanol to wet mill for 9 hours and mix well. After drying the above-mentioned ball-milled powder for 12 hours, weigh 10 g and put it into a graphite mold, and then complete the mold loading process in a discharge plasma sintering furnace after cold pressing with a pressure of 15 MPa; Under the condition that the vacuum degree in the sintering chamber is 8Pa, start to pass the current, and the temperature rise rate is 100°C / min. At the same time, the sinterin...

Embodiment 2

[0023] Weigh 28.50g of tungsten powder, 1.50g of chromium powder and 0.337g of zirconium carbide powder, the mass ratio of cemented carbide grinding ball to powder is 25:1, the inert gas argon is used as the protective gas, the speed of the planetary ball mill is 500r / min, and the ball mill Carry out in stages, grind for 80 minutes and stop for 20 minutes, scrape the powder once every 10 hours, add 3.371g of copper powder after ball milling for 60 hours, the ball-to-material ratio is 8:1, the speed is 150r / min, add absolute ethanol to wet mill for 6 hours and mix well. After drying the above-mentioned ball-milled powder for 10 hours, weigh 15g and put it into a graphite mold, and then complete the molding process in a discharge plasma sintering furnace after cold pressing with a pressure of 20MPa; Under the condition that the vacuum degree in the sintering chamber is 10Pa, start to pass the current, the temperature rise rate is 120°C / min, increase the sintering pressure at the ...

Embodiment 3

[0025] Weigh 28.50g of tungsten powder, 1.50g of chromium powder and 0.508g of zirconium carbide powder, the mass ratio of cemented carbide grinding ball to powder is 15:1, the inert gas argon is used as the protective gas, the speed of the planetary ball mill is 400r / min, and the ball mill Carry out in stages, grind for 60 minutes and stop for 15 minutes, scrape the powder once every 15 hours, add 20.339g of copper powder after ball milling for 78 hours, the ball-to-material ratio is 3:1, the speed is 100r / min, add absolute ethanol to wet mill for 12 hours and mix well. After drying the above-mentioned ball-milled powder for 15 hours, weigh 20g and put it into a graphite mold, and then complete the molding process in a discharge plasma sintering furnace after cold pressing with a pressure of 10MPa; Under the condition that the vacuum degree in the sintering chamber is 6Pa, start to pass the current, the temperature rise rate is 80°C / min, increase the sintering pressure at the ...

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Abstract

The invention discloses a low-temperature rapid preparing method for high-density nanocrystalline tungsten copper base block composite materials, and belongs to the technical field of refractory metaland powder metallurgy. Tungsten powder, zirconium carbide, chromium and copper are adopted as raw materials to be subjected to ball milling, the combined action of grain boundary element segregationand nanometer dispersion particles is utilized, a discharge plasma rapid sintering method is combined, rapid solid phase sintering densifying is achieved under the conditions of low temperature and high pressure, and a series of adjustable Cu content tungsten copper base block composite materials with the density being 95% or above and the average grain size being 100 nm or below are successfullyprepared. The low-temperature rapid preparing method solves the contradictory problem about material compactness and grain size growth in the sintering process, and the problem exists in the refractory metal and nonferrous alloy field over the years.

Description

technical field [0001] The invention relates to a low-temperature rapid preparation method of a tungsten-copper-based block composite material with high density and nanocrystalline structure, which can prepare dense nanocrystalline tungsten-copper-based composite materials with different copper contents, and belongs to refractory metal and powder metallurgy technology field. Background technique [0002] Tungsten-copper-based composite materials have the characteristics and advantages of both tungsten and copper, and have excellent properties such as high strength, hardness, and electrical and thermal conductivity. They have become indispensable materials in the fields of national economy, military affairs, and aerospace, such as electrode electrical contacts Materials, heat sink packaging materials, rocket nozzles, missile nozzle throat linings, gas rudders and other high temperature components. With the expansion of industrial applications and the emergence of high-end re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C32/00C22C1/05B22F3/105B22F9/04
CPCY02P10/25
Inventor 宋晓艳曹立军侯超
Owner BEIJING UNIV OF TECH
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