Ag/Cr2AlC电接触材料的微观组织与耐电弧侵蚀性能

doi:10.11896/cldb.23080215

材料导报

2024, Vol. 38

Issue (21): 23080215-5 https://doi.org/10.11896/cldb.23080215

金属与金属基复合材料

Ag/Cr₂AlC电接触材料的微观组织与耐电弧侵蚀性能

汪丹丹^1,*, 朱泓羽¹, 魏坤霞¹, 魏伟¹, 田无边², 孙正明²

1 常州大学材料科学与工程学院,江苏常州 213164
2 东南大学材料科学与工程学院,南京 211189

Microstructure and Arc Erosion Resistance Properties of Ag/Cr₂AlC Electrical Contact Materials

WANG Dandan^1,*, ZHU Hongyu¹, WEI Kunxia¹, WEI Wei¹, TIAN Wubian², SUN Zhengming²

1 School of Materials Science and Engineering, Changzhou University, Changzhou 213164,Jiangsu, China
2 School of Materials Science and Engineering, Southeast University, Nanjing 211189, Jiangsu, China

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摘要 Ag基电接触材料被广泛应用于低压电路控制器件中,在电路中起承载、分断、闭合电流的作用。Cr₂AlC作为M_n+1AX_n相的典型代表之一,兼具金属和陶瓷的优良性能,有望成为Ag基电接触材料中优良的增强相。本项目采用粉末冶金法制备Ag/Cr₂AlC复合材料,表征其微观组织,探究其界面反应,并研究材料的物理性能和耐电弧侵蚀性能。结果表明,由于Al原子的弱结合,经烧结,Ag与Cr₂AlC发生明显的界面反应,生成Ag₃Al和Cr-C化合物。相比于生坯,Ag/Cr₂AlC熟坯的密度和硬度下降,分别为9.04 g/cm³和(78.9±5.5) HV,且由于界面反应的发生,材料的电阻率为(141.9±0.4)×10^-9 Ω·m。电弧侵蚀结果表明,Ag/Cr₂AlC材料经电弧侵蚀生成Al₂O₃,Ag发生熔融喷溅,产生明显凸起,Ag/Cr₂AlC的质量损失为6.25%。

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	汪丹丹
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	魏伟
	田无边
	孙正明

关键词: 电接触材料 MAX相 Ag/Cr₂AlC 界面反应耐电弧侵蚀

Abstract: Ag-based electrical contact materials are widely used in low-voltage circuit control devices, serving the role of carrying, breaking, and closing electrical currents in circuits. Cr₂AlC, as a representative of the M_n+1AX_n phases, possesses a combination of the excellent properties of both metals and ceramics, making it a promising reinforcing phase in Ag-based electrical contact materials. In this work, Ag/Cr₂AlC composites were prepared using powder metallurgy method. The microstructure including interfacial reactions, the physical properties and arc erosion resistance were investigated. The results indicated that due to the weak bonding of Al atoms, significant interfacial reactions occurred between Ag and Cr₂AlC after sintering, resulting in the formation of Ag₃Al and Cr-C compounds. In comparison to the green bodies, the density and hardness of the sintered Ag/Cr₂AlC were reduced, i.e., 9.04 g/cm³ and (78.9±5.5)HV, respectively. However, due to the occurrence of interfacial reactions, the electrical resistivity of the Ag/Cr₂AlC substantially increased to (141.9±0.4)×10^-9 Ω·m. Arc erosion tests revealed that the mass loss of the Ag/Cr₂AlC was 6.25%, and the main arc erosion product was Al₂O₃. Meanwhile, Ag undergone melting and sputtering, resulting in a noticeable protrusions.

Key words: electrical contact materials MAX phases Ag/Cr₂AlC interfacial reaction arc erosion resistance

出版日期: 2024-11-10 发布日期: 2024-11-11

ZTFLH:

TQ174

基金资助: 国家自然科学基金(52302057);江苏省自然科学基金青年项目(BK20220627);常州市应用基础研究项目(CJ20210114);江苏省高等学校自然科学研究面上项目(21KJB430001)

通讯作者: *汪丹丹,常州大学材料科学与工程学院讲师、硕士研究生导师。2020年于东南大学材料科学与工程专业,同年到常州大学工作至今。目前主要从事MAX相、MAX相增强金属基复合材料、电接触材料、镁合金等方面的研究工作。发表论文16余篇,包括Corrosion Science,Materials Science & Engineering A, Journal of Alloys & Compounds等。ddwang@cczu.edu.cn

引用本文:

汪丹丹, 朱泓羽, 魏坤霞, 魏伟, 田无边, 孙正明. Ag/Cr₂AlC电接触材料的微观组织与耐电弧侵蚀性能[J]. 材料导报, 2024, 38(21): 23080215-5.
WANG Dandan, ZHU Hongyu, WEI Kunxia, WEI Wei, TIAN Wubian, SUN Zhengming. Microstructure and Arc Erosion Resistance Properties of Ag/Cr₂AlC Electrical Contact Materials. Materials Reports, 2024, 38(21): 23080215-5.

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http://www.mater-rep.com/CN/10.11896/cldb.23080215 或 http://www.mater-rep.com/CN/Y2024/V38/I21/23080215

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