Abstract
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 significantly increased first and then decreased, the density and hardness of Ag–SnO2/CuO decreased first and then increased, and the Ag–SnO2/CuO increased first 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 significantly by selecting appropriate SnO2 particle size.
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