爆炸烧结CuCr触头材料的性能

Characteristics of CuCr contact materials made by explosive sintering

采用机械合金化工艺由Cu ,Cr元素粉按质量比各半合成CuCr预合金粉 ,然后采用爆炸烧结工艺制备真空断路器用电触头材料CuCr合金 ,着重研究了工艺参数对CuCr触头材料性能的影响。结果表明 :采用该工艺能制备高密度 (超过 7.398g/cm3)、高硬度 (超过HB144 )和低电导率 (低于 10 6kS/m)的CuCr触头材料 ;球磨时间对CuCr合金性能影响较大 ,随着球磨时间的增加 ,CuCr合金密度和硬度逐渐升高 ,而电导率则减小 ;装药密度对CuCr合金的性能影响较小 ;

The CuCr alloy powders (the mass ratio was 1∶1) were made by mechanical alloying, then CuCr alloys for the vacuum breaker were aprepared by explosive sintering. The effect of the technology parameters on the characteristics of the CuCr contact materials was studied. The results show that CuCr contact materials with higher density (>7.398?g/mm 3), higher rigidity (>HB144) and lower conductance (106?kS/m) can be made by the process; grinding time has important effect on the characteristics of CuCr alloy, the longer the grinding time is, the higher the density and the rigidity of the CuCr alloy is, and the lower the conductance of the CuCr alloy is. The effect of the explosive density on the characteristics of CuCr alloys is not obvious; when the ratio of explosive to powder or the ratio of explosive to powder and tube is too large or too low, the characteristics of the CuCr alloys are deteriorated.