作　　者： (李睿）; (柳青）; (孟宪刚）; (曲强）; (卢绍平）; (武海军）;

机构地区： 北京控制工程研究所,北京100094

出　　处： 《贵金属》 2017年第3期46-49,共4页

摘　　要： 测定了Au-9Ni合金在不同热处理状态下的预变形刷丝在高低温循环处理过程中的接触压力变化,研究了不同温度下刷丝蠕变速率变化。结果表明,刷丝成型后在330~350℃温度区间内进行时间为30 min的退火能够消除成型加工造成的应力集中;在-50~150℃的温度循环过程中,电刷的压力随循环次数的增加而减小,约1000个循环后进入稳定期;模拟结果表明,112000次循环后压力降低约20%;在恒温恒压环境中,150℃刷丝基本不产生变形,250℃刷丝慢慢变形但幅度较小,350℃蠕变率极高。 The change in the contact pressure and creep rate of Au-9Ni alloy brushes under different heat treatment conditions were studied.The result indicated that the stress concentration of the brushes as a result of the forming procedure could be reduced by annealing at330~350℃for30minutes.In the process of thermal cycling at-50~150℃,the contact pressure of the brushes decreased with the increase of the cycle number,and reached a steady state after about1000cycles.The simulation results demonstrated that the pressure dropped by about20%after112000cycles.In a constant temperature and pressure environment,the brushes did not deform at150℃and deformed slowly and slightly at250℃,but deformed severely with a high creeping rate at350℃.

关 键 词： 金属材料 合金 温度循环 力学性能 蠕变