Factor of Effecting Tungsten Copper Composite Sintered Density
Tungsten copper composite materials possess excellent thermal, electrical properties and high hardness and low coefficient of thermal expansion. With the rapid development of the electronics industry, the demand for high-performance tungsten copper materials are in urgent needs. During the preparation process of tungsten copper material, powder size and shape of pressure are the most important technological factors which will greatly effect tungsten copper composite material sintering and performance .
1.The influence of powder particle size for material density.The study shows that,though tungsten particles were hardness and difficult to be crushed refinement at the time of ball milling, but as ball milling time goes by, the sharp edge portion of the particles will be weared and teared constantly and tend to spheroidizing.But he copper particles becomes smaller and smaller due to the continuous milling,strang roliing ,impacting,grinding and tearing.And then both tungsten and copper powders will become refinement and round. It also makes the powder more evenly distributed, and improve the material density.
2.Molding Pressure on material densification.It's possible for low pressure pressed compacts to provide more freedom place to tungsten copper particles for infiltrating tungsten particles.When sintered at the same temperature,the densification velocity will be faster than high pressure pressed compacts.Owing to the lower melting point of copper in the low pressure pressed compacts,as temperature rises,the material will be infiltrated with copper in high pressure pressed compacts. Then,the phenomenon of copper lossing will be certain controled.It helps to reduce the sintering temperature and save producing costs.
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