Arc characteristics and microstructure evolution of W-Cu contacts during the vacuum breakdown

被引:39
|
作者
Wei, Xin [1 ,2 ]
Yu, Demei [1 ,2 ]
Sun, Zhanbo [1 ]
Yang, Zhimao [1 ,2 ]
Song, Xiaoping [1 ,2 ]
Ding, Bingjun [1 ,2 ]
机构
[1] Xi An Jiao Tong Univ, Sch Sci, MOE Key Lab Nonequilibrium Synth & Modulat Conden, Xian 710049, Peoples R China
[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
基金
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词
W-Cu alloys; Vacuum breakdown; Work function; Cathode spots; Liquid phase separation; WORK FUNCTION; 1ST PRINCIPLES; EROSION; ALLOYS; CR; 1ST-PRINCIPLES; DENSIFICATION; STABILITY; BEHAVIOR; FIELD;
D O I
10.1016/j.vacuum.2014.04.005
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The microstructures of surface melt layers for W-Cu contact materials after vacuum breakdown were analyzed in detail and the arc motion characteristic was investigated with a digital high-speed video camera. The experimental results revealed that cathode spots probably occurred on the Cu phase during the first breakdown. The Cu-rich melts were sprayed out of the cathode spots due to the high plasma pressure and great volume expansion resulting from the partial boiling of Cu. The spraying of the droplets was clearly observed by a digital high-speed video camera. The calculated work function of the close-packed plane of Cu (111) was smaller than that of W (110) and the arc would firstly appear on the Cu phase of the W-Cu alloys during the breakdown. The theoretical calculations were in exact accordance with the experimental results. The experiment also indicated that liquid phase separation was involved in the microstructure evolution of W-Cu alloys. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:83 / 89
页数:7
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