<strong>Ag/Ti<sub>2</sub>AlC</strong>复合材料的电弧侵蚀及退化机理

doi:10.11900/0412.1961.2018.00534

金属学报

2019, Vol. 55

Issue (5): 627-637 DOI: 10.11900/0412.1961.2018.00534

本期目录 | 过刊浏览

Ag/Ti₂AlC复合材料的电弧侵蚀及退化机理

丁健翔^1,²,田无边²,汪丹丹²,张培根²,陈坚²,孙正明²(

)

1. 安徽工业大学材料科学与工程学院冶金减排与资源综合利用教育部重点实验室马鞍山 243002
2. 东南大学材料科学与工程学院江苏省先进金属材料重点实验室南京 211189

Arc Erosion and Degradation Mechanism ofAg/Ti₂AlC Composite

Jianxiang DING^1,²,Wubian TIAN²,Dandan WANG²,Peigen ZHANG²,Jian CHEN²,Zhengming SUN²(

)

1. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China
2. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

引用本文:

丁健翔,田无边,汪丹丹,张培根,陈坚,孙正明. Ag/Ti₂AlC复合材料的电弧侵蚀及退化机理[J]. 金属学报, 2019, 55(5): 627-637.
Jianxiang DING, Wubian TIAN, Dandan WANG, Peigen ZHANG, Jian CHEN, Zhengming SUN. Arc Erosion and Degradation Mechanism ofAg/Ti₂AlC Composite[J]. Acta Metall Sin, 2019, 55(5): 627-637.

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摘要:

通过动态电弧放电实验深入研究了Ag/10TAC触头材料的抗电弧侵蚀机理。不均匀的电弧侵蚀使Ag/10TAC触头表面产生未受侵蚀、过渡和侵蚀3个特征区域。Ag微结构和化学组成变化归因于Ag熔化、气化、吸收O₂、Ag-O蒸气沉积和Ag-Al相互扩散。电弧侵蚀过程中Ti₂AlC微结构演变和氧化行为归因于Ti₂AlC的快速“分解-氧化”过程。触头表面的结构和功能变化导致了Ag/10TAC复合材料退化。

关键词 ：金属陶瓷复合材料, 电接触材料, MAX相, 微结构, 氧化, 电弧侵蚀机理

Abstract：

Ag-based contact is widely used in low-voltage switch (contactor, relay and breaker), which determines the safety and stability of the circuit. Toxic Ag/CdO goes against the development of environmentally friendly materials and will be excluded from future market. Ag/10%Ti₂AlC (mass fraction, Ag/10TAC) composite shows excellent arc erosion resistance, and has the potential to replace Ag/CdO. Dynamic electric arc discharging experiment was performed on the Ag/10TAC contact surface to investigate its arc erosion mechanism. Inhomogeneous arc erosion generates three featured regions (unaffected, transitional, affected) on the contact surface. The various microstructure and chemical composition of Ag are attributed to the melting and vaporization of Ag, absorption of O₂, deposition of Ag-O vapor, and interdiffusion of Ag-Al. The rapid "decomposition-oxidation" process of Ti₂AlC accounts for the microstructure evolution and oxidation behavior of Ti₂AlC during arc erosion. The changes of structure and function on the contact surface lead to the degradation of Ag/10TAC composite.

Key words： metal-ceramic composite electrical contact material MAX phase microstructure oxidation electric arc erosion mechanism

收稿日期: 2018-11-23

ZTFLH:

TG148

基金资助:国家自然科学基金项目(51731004);国家自然科学基金项目(51671054);国家自然科学基金项目(51501038);中央高校基本科研业务费项目(2242018K40108);中央高校基本科研业务费项目(2242018K40109);江苏省自然科学基金项目(BK20181285)

作者简介: 丁健翔，男，1987年生，博士生

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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00534 或 https://www.ams.org.cn/CN/Y2019/V55/I5/627

图1 电弧放电前Ag/10%Ti2AlC (Ag/10TAC)复合材料的SEM像和XRD谱

图2 不同放电次数下Ag/10TAC触头的OM像

图3 放电次数增加过程中Ag/10TAC触头的质量和面积损失

图4 不同放电次数下Ag/10TAC触头表面整体形貌演变及电弧作用在Ag/10TAC触头表面的示意图

图5 放电1次后Ag/10TAC触头表面未受侵蚀区域的SEM像

图6 放电1次后Ag/10TAC触头表面过渡区域微结构、元素组成和元素面分布

图7 放电1次后Ag/10TAC触头表面受侵蚀区域微结构和元素组成

图8 放电10次后Ag/10TAC触头表面受侵蚀区域微结构和元素组成

图9 放电100次后Ag/10TAC触头表面受侵蚀区域微结构

表1 图9b中黑色块体的EDS分析

图10 放电1000次后Ag/10TAC触头表面受侵蚀区域微结构及受影响区域表面XRD谱

图11 放电5610次后Ag/10TAC触头受侵蚀区域表面微结构

图12 Ag/10TAC复合材料电弧侵蚀和退化机理示意图

表3 图10e中侵蚀坑边缘和内部的EDS分析

表2 图10b中黑色块体的EDS分析

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