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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...
Hydrogenated microcrystalline silicon films were deposited by glow discharge decomposition of SiH 4 diluted in mixed gas of Ar and H 2 . By investigating the dependence of the film crystallinity on the flow rates of Ar and H 2 , we showed that the addition of Ar in diluted gas markedly improves the crystallinity due to an enhanced dissociation of SiH 4 . The infrared-absorption...
The microstructure and interface of Cu/Cr phases in vacuum casting Cu-25Cr alloy and sintered CuCr25 p/m contact materials were investigated by transmission electron microscopy (TEM). Some fine secondary Cr-dendrites have preferred orientation relationships of (110)Cr // (111)Cu and [011]Cr // [1macr12]Cu, and a single set of misfit dislocations separated by a space of ~6 nm are distributed on the...
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