稀土元素对铜-铬触头材料显微组织和电击穿性能的影响  

Effect of Rare Earth on Microstructure and Electrical Breakdown Properties of Cu-Cr Alloys

作　　者：李晓燕[1] 王顺兴[1] 田保红[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《机械工程材料》2008年第11期69-71,共3页Materials For Mechanical Engineering

基　　金：河南省杰出青年基金资助项目(6521002700);河南省高校创新人才培养工程资助项目(豫教高2005-126)

摘　　要：对加入不同含量稀土元素(RE)的铜-铬触头材料在10 Pa真空条件下的电击穿性能进行了研究;通过对比不同稀土元素含量铜-铬触头材料的显微组织和电击穿前后硬度值的变化,分析了铜-铬触头材料的击穿机理。结果表明:稀土元素的加入能显著细化晶粒,并能提高材料的耐电压强度,加入质量分数为0.20%RE比加入0.06%RE更能细化铜-铬合金晶粒,其耐电压强度和硬度的提高也更明显;稀土元素的加入有利于电弧的熄灭。The electrical breakdown properties of Cu-Cr contact materials with different RE content under 10 Pa vacuum condition were studied. Breakdown mechanism of Cu-Cr contact materials with different RE Content were analyzed through comparing the variation of microstructure and hardness. The results show that RE can make the grain finer and increase the dielectric strength. 0. 20%RE addition made the grain finer than 0. 06%RE did and increased the dielectric strength and hardness more obviously, so 0. 20%RE addition made the contact material to be interruppted more easily.

关 键 词：铜-铬合金 稀土 电击穿 

分 类 号：TG146.1[一般工业技术—材料科学与工程]