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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...
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...
Diffusion welding tests of vacuum casting Cu-30Cr, Cu-30CrZr, Cu-30CrTe and Cu-30CrZrTe alloy contact materials as well as sintered CuCr25 p/m contact materials were performed in the vacuum chamber of Gleeble 3500, and the joining forces of the welded pairs were measured by tensile test at ambient temperature. Characteristics of fracture surfaces were analyzed by optical microscope and SEM. It shows...
Growth quality of quantum-cascade-lasers (QCLs) is difficult to be characterized due to the demanding requirements on hetero-interface quality and thickness control for all >1000 nano-scale superlattice structure. In this work we employ X-ray diffractometry (XRD) to effectively evaluate QCL-wafer growths.
It is important to comprehend the interruption phenomenon of contact materials for aiming at adaptation to high voltage of vacuum circuit breakers. Then, we carried out measurement of arc energy and anode surface temperature and observation of vacuum arc by using the vacuum chamber. Moreover, we made prototype of new contact materials that was based on these tests result. And these contact materials...
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