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Cu-Cr alloys have been widely used as an electrical contact material for medium-voltage and high-power vacuum interrupters. The performance of the Cu-Cr contact material depends strongly on chemical composition, grain size of high-melting Cr-rich solid solution, and defects. Few experimental studies showed that nanocrystalline Cu-Cr material possesses improved switching performance with respect to...
The microstructure and Te distribution in Cu-25CrTe contact materials doped with 0.01, 0.6 and 2.0 pct Te respectively were investigated by TEM with an EDS system. Meanwhile the tensile strength of eight Cu-25CrTe contact materials at ambient temperature was measured. It is shown that Te atoms segregate at the interface of Cu/Cr phases in the Cu-25CrTe materials; a globular CrCu2Te 2 intermetallic...
Cu-Cr alloys with additions of high oxygen affinity elements C, Al, La, Ti and Zr were inductively melted and cast in an alumina crucible. Microstructure of the as-cast ingots was investigated using an optical microscope and a scanning electron microscope. The ingots with low Cr contents solidify into a dendritic microstructure, whereas those with high Cr content solidify into a droplet-shaped microstructure...
Tensile fracture at room temperature and the faying microstructures of vacuum casting Cu-30CrTe, Cu-30Cr and sintered CuCr25 contact materials after diffusion welding in vacuum were evaluated by Optical Microscope and SEM. It is shown that there are different fracture characteristics in the three contact materials, and distinct microstructures formed at the faying surface of the Cu-30CrTe from that...
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