Translated Abstract
The cathode spot of vacuum arc is one of the most fashionable researches in arc and physics fields，because of its complexity and variability, the research work about cathode spot is very difficult, researchers did not form unified understandings on it. People mainly depended on high speed camera to get the dynamic parameters of the cathode spots in previous research, but spatial resolution of this kind of equipment was not high enough, many parameters and models obtained through this method were not completely convinced. SEM was another kind of facilities on the spots’ research, because cathode spots moved randomly on the surface of most coarse-crystalline materials, it was only used to investigate the size and sub-structure of the cathode spots. SEM has high spatial resolution, making SEM apply to the dynamic research of cathode spots is the objective of all arc researchers. Amorphous materials are isotropic, grain boundary-free, which probably make cathode spots move directionally on the surface of amorphous materials, and make it possible that SEM applies to the dynamic research of cathode spots. The arc was concentrated on several local zones when breakdown happened on most of the coarse-crystalline materials’ surface. Size effect of nano-crystalline materials probably changes this phenomenon. In this paper cathode spots of Cu60Zr28Ti12、Zr55Cu30Al10Ni5 alloys having different microstructures were studied for the purpose of probing the new phenomena. The main conclusions included:1. Amorphous Cu60Zr28Ti12、Zr55Cu30Al10Ni5 alloys were prepared by the technique of melt-spin. Partially crystallized Cu60Zr28Ti12、Zr55Cu30Al10Ni5 with some nano-crystallite in the amorphous matrix were prepared by annealing in vacuum.2. The results indicated that the composition and microstructure of materials, parameters of the circuit had important influence on the morphology of the arcing zones. 3. Under certain parameters of the circuit many “worm-like” cathode spots traces appeared on the surface of amorphous Cu60Zr28Ti12、coarse-crystalline Zr55Cu30Al10Ni5 alloys, which made it possible to use SEM for the measurement of some dynamic parameters of cathode spots.4. Significant arc spreading happened on the surface of nano-crystalline/amorphous Cu60Zr28Ti12、Zr55Cu30Al10Ni5 alloys, which improved the local arc erosion of coarse-crystalline materials. Nano-crystalline/amorphous Cu60Zr28Ti12、Zr55Cu30Al10Ni5 alloys had lower chopping currents compared to their coarse and amorphous counterparts, respectively.
Translated Keyword
[Vacuum arcCathode spotCuZrTiZrCuAlNiAmorphousNano-crystalline/amorphous]
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