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The Cr–Ni and Cu–Cr–Ni alloys were prepared and their dielectric strengths were tested in a vacuum chamber. The experimental results showed that the Cr 95 Ni 5 (at.%) alloy prepared by vacuum arc melting could strengthen the dielectric strength of Cr by 130%, and the addition of the Cr–Ni alloy powders could more obviously improve the dielectric strength of the Cu 55 Cr ...
The microstructures of the surfaces and cross sections of Cu–Cr contact alloys were analyzed after the vacuum breakdown was repeated for 100 times. The results reveal that the liquid phase separation was involved in the microstructure evolution of the alloys during the breakdown. The Cr-rich phase from the liquid separation featured the morphology of spherical- and sheeted-shaped particles. The sizes...
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