Preparation and Anti-arc Erosion Property of Ag Matrix Electrical Contact Material Reinforced by Novel Ti2Cd
SUN Wanjie1,†, SHI Yuxin1,†, DING Jianxiang1,2,*, REN Wanbin3, PAN Zhixiong4, ZHANG Peigen2,*, SUN Zhengming2
1 School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, Anhui, China 2 Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China 3 School of Electrical Engineering & Automation, Harbin Institute of Technology, Harbin 150001, China 4 Foshan Tongbao Electical Precision Alloy Co., Ltd., Foshan 528100, Guangdong, China
Abstract: Due to their outstanding electrical contact properties, Cd-containing silver- matrix electrical contact materials can meet the requirements of high stability and long life for military defense and aerospace applications. In order to further reduce the Cd content under the premise of meeting the high-performance requirements, in this study, high-purity intermediate Ti2Cd powder of MAX phase (Ti2CdC) was synthesized with a pressureless technique and then applied to reinforce the Ag matrix. The Cd content of the as-prepared Ag/Ti2Cd composites was actually reduced by 38.31% compared with conventional Ag/CdO material. Based on the systematic study of the effect of heat treatment temperature on the physical phase, morphology, interface and comprehensive physical properties of Ag/Ti2Cd composites, the preferred samples (heat treated at 400 °C for 1 h) showed high density (97.77%), low resistivity (2.34 μΩ·cm), moderate hardness (90.8HV), high tensile strength (189.9 MPa), and exhibited good electrical contact performance after 40000 cycles of arc discharging under severe conditions (DC 28 V/20 A). The results of microscopic morphological evolution, phase change and elemental distribution of the electrical contact surface show that the combination of high stability of Ti2Cd reinforcing phase, good interfacial bonding with Ag matrix and improved melt pool viscosity in the primary stage of arc erosion, results in low and stable contact resistance (average value 13.20 mΩ) and welding force (average value 0.6 N), low fluctuation of static force (2.2—2.5 N). The decomposition and absorption energy of Ti2Cd and the arc extinguishing effect of Cd vapor are the main reasons for the stable arcing energy and arcing time of electric contacts in the late stage of arc erosion.
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2024, Vol. 38 
