电弧侵蚀过程Ag/Ti_(2)SnC复合电触头材料纳米力学退化行为及其机理  

Nano-mechanical Degradation Behavior and Mechanism of Ag/Ti_(2)SnC Composite Electrical Contact Materials During Arc Erosion

作　　者：魏鑫鹏 吴雪莲 吴宬哲 孙万杰 丁健翔 柏小平 柳东明 张世宏[2] 任万滨[5] 孙正明 WEI Xinpeng;WU Xuelian;WU Chengzhe;SUN Wanjie;DING Jianxiang;BAI Xiaoping;LIU Dongming;ZHANG Shihong;REN Wanbin;SUN Zhengming(School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243032;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma’anshan 243002;School of Materials Science and Engineering,Southeast University,Nanjing 211189;Zhejiang Fudar Alloy Materials Technology Co.,Ltd.,Wenzhou 325025;School of Electrical Engineering&Automation,Harbin Institute of Technology,Harbin 150001)

机构地区：[1]安徽工业大学材料科学与工程学院,马鞍山243032 [2]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,马鞍山243002 [3]东南大学材料科学与工程学院,南京211189 [4]浙江福达合金材料科技有限公司,温州325025 [5]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《机械工程学报》2024年第24期163-176,共14页Journal of Mechanical Engineering

基　　金：国家自然科学基金(52101064,52171033);安徽省质量基础设施标准化专项(2023MKS01);江苏省博士后科研资助计划(2020Z158);江苏省自然科学基金(BK20220627)资助项目。

摘　　要：银基电触头是承载低压电器设备结构-功能一体化的关键材料,在实际服役过程中“材料组成-力学特性”的维持是抵抗电弧侵蚀进而避免电触头过早失效的关键。阐明材料在电弧侵蚀过程中纳米力学性能的演变规律,对于丰富电接触机理、开发新型电接触材料进而推动低压电器更新换代具有重要意义。设计了经不同次数电弧侵蚀的Ag/Ti_(2)SnC电触头材料样品,并采用纳米压痕技术(静态压痕、蠕变、连续刚度、NanoBlitz 3D压痕)对其断面近电弧侵蚀区域纳米力学性能进行了系统分析。研究发现,尽管随电弧侵蚀次数增加材料纳米力学性能逐渐退化,但退化速度呈明显减缓趋势。在侵蚀初期(1~100次)和中期(100~1000次),力学性能下降主要归因于增强相Ti_(2)SnC的部分分解和有限表面氧化。而在侵蚀后期(1000~6200次),即使电弧破坏由表及里深入了Ti_(2)SnC内部,但表面氧化层的存在和Ag-Sn互扩散行为有效延缓了力学性能的退化速率,从而使Ag/Ti_(2)SnC仍保持了较好的抗电弧侵蚀能力。从纳米力学角度深入剖析了Ag/Ti_(2)SnC复合电触头材料的抗电弧侵蚀性能及其机制,为该体系材料的持续设计和优化提供了理论参考。Silver-based electrical contact is a key material for structural-functional integration of low-voltage electrical equipment.In the actual service process,the maintenance of material composition-mechanical properties is the key to resist arc erosion and avoid premature failure of electrical contact materials.Therefore,elucidation of the degradation law of nano-mechanical properties at different arc erosion stages can further enrich the mechanism of electrical contact,which is of great significance for developing new electrical contact materials and advancing the innovation of low-voltage switch materials.In this study,Ag/Ti_(2)SnC electrical contact material samples with different arc erosion times were designed,and nanoindentation techniques(static indentation,creep,continuous stiffness,NanoBlitz 3D indentation)were used to systematically analyze the nanomechanical properties of the section near the arc erosion area.Our results indicated a gradual degradation in the nano-mechanical properties of the samples with increasing arc erosion times,although the rate of this degradation appeared to decelerate over arc erosion times.During the early(1~100 times)and intermediate(100~1000 times)stages of arc erosion,the decline in the nano-mechanical properties was primarily due to the decomposition of Ti_(2)SnC and limited surface oxidation.During the later stages of arc erosion(1000~6200 times),even though Ti_(2)SnC damage from the surface to the inside,the formation of a surface oxidation layer and Ag-Sn interdiffusion behavior effectively slowed the mechanical property degradation,enabling Ag/Ti_(2)SnC to maintain good arc erosion resistance.This study delivers an insightful nano-mechanical perspective on the arc erosion resistance of Ag/Ti_(2)SnC electrical composite contact materials,providing a solid theoretical base for future material system continued design and optimization.

关 键 词：MAX相 银基复合电触头 纳米力学行为 材料微结构 电弧侵蚀机理 

分 类 号：TG148[一般工业技术—材料科学与工程] TM286[金属学及工艺—金属材料]