最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

Ag/SnO₂(x)-MeO(y) composite powders were obtained by means of mechanical alloying different contents of CuO or Fe₂O₃ powders with Ag and SnO₂ powders, and Ag/SnO₂(x)-MeO(y) electrical contact materials were prepared by hot pressing process. The microstructure and physical and mechanical properties of the materials were characterized by scanning electron microscopy, X-ray diffractometry, resistance tester, hardness tester and tensile tester. The results show that the density of Ag/SnO₂(x)-MeO(y) materials decreases with the increase of dopant content, and CuO is more conducive to improving the conductivity of Ag/SnO₂(x)-MeO(y) material than Fe₂O₃. The two dopants can obviously improve the capacity of plastic deformation of Ag/SnO₂(x)-MeO(y) material. The Ag/SnO₂(11.2%)-CuO(0.8%) material (i.e. CuO content =0.8%) exhibits the best comprehensive properties with the resistivity about 2.35 μΩ?cm, elongation about 9.1% (higher than that of Ag/SnO₂ material by 93.6%).