Method for preparing ultra-fine tungsten-copper composite powder

Abstract

The superfine tungsten copper complex powder is made of tungsten and copper oxidization mixing with organic monomer and coupling water solution grind ball to trigger radiation and forming high polymer moisture gel, dehydration for calcining in 600-800deg.C with the yield recovered in hydrogen environment. The complex powder is evenly scattered with W and Cu, with grain size of 200-300 mu m, getting superfine complex material of 2-3 mu m sintering lower than 1200deg.C, with relative density higher than 99%. It has good electronic and dynamic feature, meeting requirement of relative high feature components.

Description

1. Technical field [0001] The invention relates to a method for preparing a powder metallurgy composite material, in particular to a method for preparing an ultrafine tungsten-copper composite powder for preparing a W-Cu composite material with high density, ultrafine grain and high conductivity. 2. Background technology [0002] Powder metallurgy W-Cu composite materials have good physical and mechanical properties, ablation resistance, and excellent thermal shock resistance and microwave absorption properties, etc., and are widely used as electrical contactors, vacuum circuit breakers, heat sink materials, etc. and structural devices. In these applications, W-Cu materials are often required to have higher density to improve their performance level. However, because W and Cu are incompatible with each other, the density difference between the two is large. It is difficult to obtain a uniform microstructure and achieve Higher degree of sintering densification. Some studie...

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Problems solved by technology

However, because W and Cu are incompatible with each other, the density difference between the two is large. It is difficult to obtain a uniform microstructure and achieve Higher degree of sintering densification

Some studies have shown that adding Ni, Co, Fe, Pd and other elements can greatly improve the sintering performance of W-Cu system through activation sintering, but the addition of these elements will have a negative impact on the electrical and thermal conductivity of the material.

In addition, the W-Cu powder prepared by mechanical alloying also has good sintering performance, but the long-term high-energy ball milling during mechanical alloying is easy to introduce impurities, and there are also shortcomings in terms of energy consumption.

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