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Simulation and Experimental Study on Properties of Ag/SnO <sub/>2</sub> Contact Materials Doped with Different Ratios of Ce
摘要： SnO2 in the Ag/SnO2 contact material is a kind of high hardness and almost insulated wide bandgap semiconductor material. In the process of use, the contact resistance is larger and the temperature rise is higher, which reduces the reliability of contacts and shortens the electrical life. In order to improve the properties of Ag/SnO2 contact materials, based on the first principle of density functional theory, this paper presents a method of doping SnO2 with the calculation of different proportions of rare earth Ce electrical and mechanical properties. The results of energy band, density of state, and elastic constant show that when the doping ratio of Ce is 0.125, the electron mobility is the highest, the conductivity is the best; the hardness decreases, and the universal elastic anisotropy index is the smallest. Finally, in the experiment, SnO2 powders with different doping ratios are prepared by the sol-gel method, and Ag/SnO2 contacts with different doping proportions are prepared by powder metallurgy. Arc energy, contact resistance, and hardness are measured; scanning electron microscopy was used to observe and analyze the surface morphology. The final simulation and experimental results are well matched.
关键词： doping,contact materials,rare earth Ce,conductivity,hardness,Ag/SnO2
更新于2025-09-10 09:29:36
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Properties of doped Ag–SnO <sub/>2</sub> electrical contact materials with different SnO <sub/>2</sub> particle sizes
摘要： It is believed that the particle size inevitably affects properties of contact materials due to the effects of microstructure. The Ag–SnO2/CuO and Ag–SnO2/Bi2O3 contact materials with six different SnO2 particle sizes were successfully fabricated through powder metallurgy method. The physical and electrical contact properties of two kinds of Ag–SnO2 contact materials with different SnO2 particle sizes were investigated. The results showed that with the increase of SnO2 particle size, the electrical conductivity of two kinds of Ag–SnO2 contact materials signi?cantly increased ?rst and then decreased, the density and hardness of Ag–SnO2/CuO decreased ?rst and then increased, and the Ag–SnO2/CuO increased ?rst and then decreased. It was found that the contact resistance and arc energy were smallest and most stable when the SnO2 particle size was about 800 nm, which indicates that the properties of two kinds of Ag–SnO2 contact materials can be improved signi?cantly by selecting appropriate SnO2 particle size.
关键词： arc energy,Ag–SnO2 contact materials,SnO2 particle size,contact resistance,physical property
更新于2025-09-09 09:28:46