1 Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189 2 Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189
Contact material is the key to switching system, and its performance determines the reliability of the electrical equipment during operation. Ag-based contact materials have been widely applied in low-voltage switches. Ag/CdO exhibits excellent properties as a contact material, but the toxicity of Cd is phasing it out. Over the past decades, Ag/SnO2, Ag/ZnO, Ag/Ni, Ag/C, Ag/W have replaced the Ag/CdO in some fields, but such replacement raises some problems such as temperature rise, large contact resistivity, poor anti-welding, weak resistance to material transfer, etc. This paper reviews the background, application, preparation, performance of Ag-based contact materials commonly used in low voltage switches. The trends in electrical contact materials including the prospect of MAX phases as reinforcement in Ag-based contact materials are discussed.
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2018, Vol. 32 
