超细WCrCu30合金的电击穿特性  

Breakdown characteristics of super fine-grain WCrCu30 alloys

作　　者：曹伟产[1] 梁淑华[1] 马德强[1] 王献辉[1] 杨晓红[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《粉末冶金材料科学与工程》2010年第4期350-355,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金重点项目(50834003)

摘　　要：采用熔渗法制备不同Cr含量的超细WCu30合金,其m(W):m(Cr)分别为20:1、15:1和10:1。通过扫描电镜观察该合金的击穿烧蚀形貌,采用高速摄影仪研究超细合金表面阴极斑点的运动规律。结果表明:WCrCu30合金在发生击穿时,首击穿相为Cr相,50次连续击穿过程中存在电压强度随击穿次数增加而增加的"老炼"现象;随Cr含量增大,WCu30合金真空放电过程中阴极斑点发生移动和分裂的现象更加明显,因而可有效避免表面的集中烧蚀,烧蚀程度降低,且使WCu30合金的截流值降低、电弧的寿命延长。A series of WCu30 alloys added with Cr particles were prepared by powder Metallurgy-infiltration.The microstructures before and after breakdown were detected by scanning electron microscope（SEM）.The motion of cathode spots was observed by using a digital high speed video camera.The results show that the first breakdown for WCrCu30 alloys is concentrated on the Cr phases.The voltage intensity increases with the increasing of breakdown time in the 50 times breakdown procedure.With Cr content increasing,the cathode spots can move a long distance and leave a long arc trace on the surface of WCu30 alloy,which results in the erosion degree and chopping current decrease and the arc life prolongs.

关 键 词：WCrCu合金 显微组织 固溶 真空电弧 阴极斑点 

分 类 号：TG146[一般工业技术—材料科学与工程]