添加元素和制备工艺对Ag(Cu)-WC触头材料性能的影响

Effect Of metal Addition And Processing Parameter On Properties Of Ag(Cu)-WCElectrical Contact Materials

分别用固相烧结和熔浸工艺制备Ag（Cu）－WC35和Ag（Cu）－WC65触头材料，研究添加元素Co、Fe、Ni和制备工艺对材料性能的影响．结果表明，WC粉愈细，烧结收缩愈小，硬度愈高．湿混合方式优于干混合．添加Co、Fe、Ni能促进Ag（Cu）－WC烧结．由于形成了金属间化合物，改善了液态铜对WC颗粒表面的润湿性，WC颗粒在液态铜中的重排列更容易进行．X射线衍射和SEM分析表明，WC颗粒表面生成了CO6W6C和CO3W3C金属间化合物．

Ag(Cu)－WC35 and Ag(Cu)0WC65 electrical contact materials were fabricatedusing solid-state sintering process and infiltration method respectively in presentwork. Effects of metal additive (Co. Fe. Ni) and processing parameter onproperties of materials were investigated, The results shows that the finer the WCpowder, the less the sintering shrinkage. Hardness of materials increased withdecreasing particle size of WC powder. Wet-mixing is superior to dry-mixing. Ithas been found that the sintering shrinkage of Ag(Cu)-WC compactness can beaccelerated by additions of cobalt. iron or nikel. Rearrangement of tungstencarbide in liquid copper could be achieved mote easily by improving the wettabilityof liquid copper on the surfaces of the tungsten carbide particles by the formation ofcobalt intermetallics, X-ray diffraction and SEM analysis have indicated theformation of intermetallic compounds Co6 W6 C and Co3 W3 C in surfaces of WCparticle when cobalt were added.