新型Ti<sub>2</sub>Cd增强银基电触头材料的制备及抗电弧侵蚀特性

doi:10.11896/cldb.23070098

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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.

Key words： low-voltage apparatus Ag matrix composite Ti-Cd compound electrical contact properties arc erosion mechanism

Published: 10 November 2024 Online: 2024-11-11

CLC number:

TG14

Fund:National Natural Science Foundation of China (52101064), Jiangsu Planned Projects for Postdoctoral Research Funds (2020Z158), and Industry-University-Research Cooperation Projects (RH2000002728, RH2000002332, RH2100000263).

Corresponding Authors: *Jianxiang Ding, associate professor and master's supervisor at the School of Materials Science and Engineering, Anhui University of Technology, obtained his Ph. D. degree in Engineering from Southeast University in 2019. His research include component design and structural regulation of MAX phase, preparation and surface modification of two-dimensional MXene, application of eco-friendly composite electrical contact materials, spontaneous growth of metal whiskers and their application in microelectronics packaging, as well as key materials for new energy vehicle power distribution systems.jxding@ahut.edu.cn;
Peigen Zhang,associate professor and doctoral supervisor at the School of Materials Science and Engineering, Southeast University, obtained his Ph. D. degree from College of Engineering at Louisiana State University in 2012. He engaged in basic and applied research on layered crystals and two-dimensional materials for a long time, especially at the preparation, properties, and application research of MAX phase/MXenes, growth mechanism and mitigation strategy of metallic whiskers in electronic components.zhpeigen@seu.edu.cn

About author: Wanjie Sun obtained his master's degree in Materials Science and Engineering from Anhui University of Technology in 2024. During his master's study, he conducted research on the synthesis and structural control of MAX phase, as well as the preparation and application of eco-friendly Ag-based composite electrical contact materials under the joint supervision of professor Zhengming Sun, associate professor Peigen Zhang, and associate professor Jianxiang Ding. He is currently a doctoral candidate at the School of Materials Science and Engineering, Sichuan University.
Yuxin Shi obtained her master's degree in Materials Science and Engineering from Anhui University of Technology in 2024. During her master's study, she conducted research on the preparation and application of MAX phase and its derived A-site metal whiskers under the joint supervision of associate professors Peigen Zhang and Jianxiang Ding.

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Cite this article:

SUN Wanjie,SHI Yuxin,DING Jianxiang, et al. Preparation and Anti-arc Erosion Property of Ag Matrix Electrical Contact Material Reinforced by Novel Ti₂Cd[J]. Materials Reports, 2024, 38(21): 23070098-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23070098 OR http://www.mater-rep.com/EN/Y2024/V38/I21/23070098

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