Arc characteristics and microstructure evolution of W-Cu contacts during the vacuum breakdown
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Arc characteristics and microstructure evolution of W-Cu contacts during the vacuum breakdown
- 发表刊物：
- VACUUM
- 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.
- 合写作者：
- Wei, Xin; Yu, Demei; Sun, Zhanbo; Yang, Zhimao; Song, Xiaoping; Ding, Bingjun
- 是否译文：
- 否
- 发表时间：
- 2014-09-01