New Preparing Process of Tungsten Copper Composite Materials
The new preparing process of tungsten copper composite materials are main followings:
1. Mechanical alloying of tungsten copper composite powders
Mechanical alloying has been greatly used in preparing alloy powder material for its advantages to obtain fine pre-alloyed powders. But it develops only few years. Through such a complex process like milling,crushing and cold welding repeatedly to achieve the mechanical alloying of tungsten and copper . It makes tungsten copper mixed powder can be uniformly distributed and extremely refined, even become Nanocrystalline. For now, the main disadvantage of mechanical alloying of tungsten copper is that the milling time increases the iron content of impurities, so that the thermal conductivity properties of the sintered tungsten copper composite material will be reduced.
2.Co-reduction of tungsten copper composite powders
Hydrogen can revert the oxides of tungsten and copper into metal.Therefore,people pays utmost attention to obtain evenly distributed tungsten-copper composite powders by co-reduction method . Copper is the core When using hydrogen to revert oxide which is generating with finely dispersed tungsten copper compound,but the tungsten distribute around it. Then it can obtain higher conductivity and performance of tungsten copper by pressing and sintering this kind of composite powder than by infiltrating method.
3.Hot isostatic compaction of tungsten copper composite materials
Using hot isostatic compaction to Process the tungsten copper composite materials,which prepared by infiltration method,can improve the density of tungsten copper composite materials which were prepared by conventional powder metallurgy.Studies have shown that hot isostatic compaction method can significantly improve the density and whole performance of tungsten copper composite materials.For the copper content of tungsten copper materials exceed 30%,its density can be increased from 95%-96% to 99% after processing by hot isostatic compaction.So the homogeneity of material tissue and performance can be well improved.
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