不同制备温度下Ti<sub>2</sub>SnC增强银基复合材料的物相、微观组织和物理性能演变

doi:10.11896/cldb.22040006

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Abstract Ti₂SnC-reinforcing Ag-based composites show potential in the electrical contacts for low-voltage switches field. In this study, Ag/10wt%Ti₂SnC (Ag/10TSC) composites were prepared by powder metallurgy at different preparing temperatures. Phase transition, microstructure evolution, interface behavior of Ti₂SnC with Ag were investigated. The results show that the Ti₂SnC remains intact structure and has weak interface diffusion with Ag under low preparing temperature (200—750 ℃), and the physical bonding gives Ag/10TSC composite high hardness and good electrical conductivity. Induced by elevated temperature (800—900 ℃), more Sn escape from Ti₂SnC and diffuse with Ag, and the gradually dissociated Ti₂SnC provide a channel for the oxygen infiltration, resulting in a small amount of oxides surrounding Ti₂SnC. The Ag-Sn interdiffusion enhances the interface bonding between Ti₂SnC and Ag matrix, and the tensile strength of composites increase significantly at the expense of electrical conductivity. At 950 ℃, TiSnC with gradual structural dissociation and oxidation produce agglomerated small particles, which causes the severe deformation and performance degradation of composites. The research results provide a theoretical basis for the future practical application of Ag/MAX electrical contact materials.

Key words： electrical contact sliver matrix composite MAX phase interface diffusion microstructure properties

Published: 25 August 2023 Online: 2023-08-14

CLC number:

TG148

Fund:Jiangsu Planned Projects for Postdoctoral Research Funds (2020Z158), Anhui Provincial Natural Science Foundation (2008085QE195), and College Students' Innovative Entrepreneurial Training Plan Program(S202110360188).

Corresponding Authors: ^*Peigen Zhang, associate professor, doctoral supervisor, obtained his Ph.D. degree from College of Engineering at Louisiana State University (Baton Rouge) in 2012. He works at the School of Materials Science and Engineering, Southeast University. His research interests include advance ceramics (including MAX phase), growth mechanism and mitigation strategy of metallic whiskers in electronic components, and the synthesis and applications of low-dimensional materials derived from layered crystals, zhpeigen@seu.edu.cn.
Zhengming Sun, received his Ph.D. degree from Institute of metal research (IMR), Chinese Academy of Sciences. He is currently a distinguished professor in the School of Materials Science and Engineering, Southeast University. His research interests cover the research and development of metallic materials, advanced ceramics and composites, including their synthesis, characterization and applications. Recently, he has led his group to investigate and develop advanced materials, including MXene and other low-dimensional materials, for the application in energy storage and conversion, zmsun@seu.edu.cn

About author: Jianxiang Ding, associate professor, master supervisor, received his Ph.D. degree from Southeast University in 2019, and now works at the School of Materials Science and Engineering, Anhui University of Technology. He has long been engaged in the foundamental and applied research of metals and ceramics field, mainly including synthesis and structural control of MAX phase, preparation and surface modification of 2D MXene, structure and performance optimization of eco-friendly electrical contact materials, growth mechanism, large-scale preparation and application of metal whisker, and development of key power distribution materials for new energy vehicle field.

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	DING Jianxiang
	XIA Xinxin
	ZHANG Kaige
	DING Kuankuan
	MA Chengjian
	ZHANG Peigen
	SUN Zhengming

Cite this article:

DING Jianxiang,XIA Xinxin,ZHANG Kaige, et al. Evolution of Phase, Microstructure and Physical Properties of Ti₂SnC-reinforcing Ag-based Composite with Elevated Preparing Temperature[J]. Materials Reports, 2023, 37(16): 22040006-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22040006 OR http://www.mater-rep.com/EN/Y2023/V37/I16/22040006

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