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Method for preparing tungsten-copper alloy by low-temperature sintering of tungsten skeleton

A tungsten-copper alloy, low-temperature sintering technology, applied in the field of preparation of tungsten-copper composite materials, can solve the problems of many closed pores, high sintering temperature, low relative density of tungsten-copper composite materials, etc., and achieves the effect of low cost and simple process

Active Publication Date: 2014-08-13
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this process are high sintering temperature, long sintering time, more closed cells, low relative density of infiltrated tungsten-copper composite material, high energy consumption, high requirements for equipment, and difficult process control.
Since there is almost no solubility between tungsten and copper and the wettability of copper to tungsten is poor, when the tungsten-copper alloy with high copper content is prepared by the infiltration method, the obtained tungsten skeleton strength and alloy density are low.
Adding Fe, Co, Ni and other active elements to tungsten can improve the sintering of the tungsten skeleton, but it will greatly reduce the electrical and thermal conductivity of tungsten-copper materials.

Method used

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  • Method for preparing tungsten-copper alloy by low-temperature sintering of tungsten skeleton
  • Method for preparing tungsten-copper alloy by low-temperature sintering of tungsten skeleton
  • Method for preparing tungsten-copper alloy by low-temperature sintering of tungsten skeleton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Preparation of tungsten-copper alloy with copper mass percentage of 25 and balance of tungsten

[0025] Using tungsten powder with a purity of 99.9% and a particle size of 2μm, and the powder used (tungsten powder + WO 2 ) WO with a total mass of 5wt.% and a particle size of 11.22μm x Put the powder into the ball mill, add a small amount of cemented carbide balls and alcohol, mix for 6 hours until the mixture is uniform, and sieve the mixed powder with 80 mesh after drying. The mixed powder was isostatically pressed under a pressure of 160 MPa and then molded, and the obtained compact was placed in a hydrogen furnace for sintering at a sintering temperature of 1400° C. and kept for 2 hours to obtain a tungsten skeleton. After cooling and reclaiming, the porosity λ of the tungsten skeleton was determined to be 57.5%, and then the copper infiltration amount was calculated. The actual copper infiltration amount is 1.1 times the calculated amount, and the pur...

Embodiment 2

[0028] Example 2: Preparation of tungsten-copper alloy with copper mass percentage of 30 and balance of tungsten

[0029] Using tungsten powder with a purity of 99.9% and a particle size of 2μm, and the powder used (tungsten powder + WO 2 ) WO with a total mass of 10wt.% and a particle size of 11.22μm x Put the powder into the ball mill, add a small amount of cemented carbide balls and alcohol, mix for 6 hours until the mixture is uniform, and sieve the mixed powder with 80 mesh after drying. The mixed powder was isostatically pressed under a pressure of 160 MPa and then molded, and the obtained compact was placed in a hydrogen furnace for sintering at a sintering temperature of 1400° C. and kept for 2 hours to obtain a tungsten skeleton. After cooling and reclaiming, the porosity λ of the tungsten skeleton was determined to be 50.54%, and then the copper infiltration amount was calculated. The actual copper infiltration amount is 1.1 times the calculated amount, and the p...

Embodiment 3

[0032] Example 3: Preparation of tungsten-copper alloy with copper mass percentage of 35 and balance of tungsten

[0033] Using tungsten powder with a purity of 99.9% and a particle size of 2μm, and the powder used (tungsten powder + WO 2 ) WO with a total mass of 15wt.% and a particle size of 11.22μm x Put the powder into the ball mill, add a small amount of cemented carbide balls and alcohol, mix for 6 hours until the mixture is uniform, and sieve the mixed powder with 80 mesh after drying. The mixed powder was isostatically pressed under a pressure of 160 MPa and then molded, and the obtained compact was placed in a hydrogen furnace for sintering at a sintering temperature of 1400° C. and kept for 2 hours to obtain a tungsten skeleton. After cooling and reclaiming, the porosity λ of the tungsten skeleton was determined to be 46.63%, and then the copper infiltration amount was calculated. The actual copper infiltration amount is 1.1 times the calculated amount. The pure ...

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Abstract

The invention discloses a method for preparing tungsten-copper alloy by low-temperature sintering of a tungsten skeleton. The method comprises the steps of carrying out wet grinding on tungsten powder of which the purity is 99.9% and the particle size is 1-7 mum and WOx powder which accounts for 5%-20% of the total mass of the powder and of which the particle size is 1-15 mum, uniformly mixing, drying and sieving, carrying out isostatic pressing on the mixed powder to obtain a green compact, sintering the green compact to obtain the tungsten skeleton, calculating the copper infiltration amount, cutting a copper plate of which the purity is greater than 99.5% into copper sheets with the same surface size as that of the tungsten skeleton, placing the copper sheets on the tungsten skeleton, feeding into a tubular furnace, heating to 1200-1400 DEG C under hydrogen atmosphere and carrying out copper infiltration. The content of copper in the tungsten-copper alloy is 15wt%-40wt%, and the balance is tungsten; the tungsten-copper alloy has more than 98% of density and the tungsten-copper alloy is suitable for being used as an electrical contact and electrode material, an electronic packaging material, a high-temperature sweating materials and the like.

Description

technical field [0001] The invention relates to the preparation of a tungsten-copper composite material, and in particular provides a method for preparing a tungsten-copper alloy by sintering a tungsten skeleton at a low temperature. Background technique [0002] Tungsten-copper alloy is a composite material composed of tungsten particles with a body-centered cubic structure and a copper binder phase with a face-centered cubic structure, which are neither solid solution nor intermetallic compounds, usually called pseudoalloys or False alloy. It combines the respective characteristics of tungsten and copper, such as high high temperature strength, high electrical and thermal conductivity, good electrical corrosion resistance, high hardness, low thermal expansion coefficient and certain plasticity, etc., and can be used through its composition ratio Change, control and adjust their respective mechanical and physical properties. In addition, tungsten-copper composite material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C27/04
Inventor 许龙山刘兴军林丽璀胡柏新吴玉蓉
Owner XIAMEN UNIV OF TECH
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