摘要
采用粉末冶金方法制备了新型银稀土氧化物触头材料 Ａｇ／Ｌａ２Ｏ３，它的密度为 ９．７１ｇ／ｃｍ３－９．９６ｇ／ｃｍ３，硬度为７６０ＭＰａ－９７０Ｍｐａ，电阻率为２．２５μΩ·ｃｍ－２．３８μΩ·ｃｍ。利用扫描电镜（ＳＥＭ）及能谱分析（ＥＤＳ），对Ａｇ／Ｌａ２Ｏ触头材料的显微组织进行了分析，发现Ｌａ２Ｏ３在Ａｇ基体中呈极细小球状（直径＜０．５μｍ）及不规则形（直径＜３μｍ）２种形态均匀分布，经激光模拟电弧作用后，Ｌａ２Ｏ３呈细小球状（＜２．５μｍ）分布于Ａｇ熔化区中，有助于减少Ａｇ液的飞溅侵蚀。经与Ａｇ／ＳｎＯ２及Ａｇ／ＣｄＯ触头材料的主要物理、机械性能相对比，所研制的Ａｇ／ＬａＯ３触头材料与后两者性能相近，因此有可能成为一种可替代 Ａｇ／ＣｄＯ的新型触头材料。
A new silver-rare earth oxide contact material Ag/La2O3(12) has been produced using powder metallurgy method. The material has favorable performances, with 9.71g/cm(3)similar to9.96g/cm(3) density; 760MPa similar to 970MPa hardness, 2.25 mu Omega (.)cm similar to 2.38 mu Omega (.)cm resistivity. The microstructure of Ag/La2O3(12) was analyzed using SEM and EDS. The experimental results indicate that global and irregular La2O3 particles, uniformly distribute in Ag matrix. After laser simulation are melting, all La2O3 particles become spherical, and distribute in the melted Ag. Compared with the main physical and mechanical properties of Ag/SnO2(12) and Ag/CdO(12), the properties of Ag/La2O3(12) are the same, and may be substitute for Ag/CdO(12) as a new contact material.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2001年第3期205-207,共3页
Rare Metal Materials and Engineering
基金
河北省自然科学基金资助项目(598033)
关键词
触头材料
稀土氧化物
粉末冶金
显微组织
性能
银
contact material
silver-rare earth oxide
powder metallurgy
microstructure
performance
