Influence of microstructure of CuCr25 cathode on the motion of vacuum arc spots

Liquid phase separation of Cu–Cr alloys during the vacuum breakdown

“…2(a)). The morphology is similar to that described in reference [18]. The backscattered electron image indicates that the large conchoidal-shaped spots consist of a bright matrix with dark spherical particles (marked by arrow C) and dark regions with irregular shapes (marked by arrow D) ( Fig.…”

Effects of Zr addition on the liquid phase separation and the microstructures of Cu–Cr ribbons with 18–22at.% Cr

“…In 2005, Zhou et al reported a similar research [12]. Yang et al have studied the arc behaviors of melt-spun Cu 71 Cr 29 ribbons [13], and the results revealed that the refining of Cr particles has resulted in a clearly improvement of electric properties. Recently, our experiment has proved that Cu-Cr alloys experienced a liquid phase separation during rapid cooling because a large positive mixing heat exists in supercooled Cu-Cr melts [14].…”

Microstructure and vacuum arc characteristics of CuO skeletal structure Ag-CuO contact materials

“…In the previous papers, C. Zhang et al reported a worm-like trace of CuZrTi contact materials under vacuum arc erosion, and the trace was produced by a arc motion continous in a random direction [29,30]. Zhimao Yang et al investigated the motion of vacuum arc on nanocrystalline CuCr25 contact materials, it was found that the arc eroded area can move a long distance in a direction and leave a long straight arc trace on the surface of nanocrystalline CuCr25 contact materials [31]. These papers pointed out that the vacuum arc characteristics is strongly affected by the microstructure of contact materials.…”