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
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.
稀土
电击穿
Cu-Cr alloy
rare earth
electrical breakdown
Abstract
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.
中图分类号 TG146.1
所属栏目 材料性能及其应用
基金项目 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)
收稿日期 2007/10/30
修改稿日期 2008/5/11
网络出版日期
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备注李晓燕(1983-),女,河南郑州人,硕士研究生.
引用该论文: LI Xiao-yan,WANG Shun-xing,TIAN Bao-hong. Effect of Rare Earth on Microstructure and Electrical Breakdown Properties of Cu-Cr Alloys[J]. Materials for mechancial engineering, 2008, 32(11): 69～71
李晓燕,王顺兴,田保红. 稀土元素对铜-铬触头材料显微组织和电击穿性能的影响[J]. 机械工程材料, 2008, 32(11): 69～71
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【5】陈晓芳,许彪,张萌.稀土元素对铜合金显微组织的影响[J].南昌大学学报:理科版,2003,27(1):33-36.
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