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O_2、Ag-O蒸气沉积和Ag-Al相互扩散。电弧侵蚀过程中Ti_2AlC微结构演变和氧化行为归因于Ti_2AlC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。
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/10 TAC composite.
作者
丁健翔
田无边
汪丹丹
张培根
陈坚
孙正明
DING Jianxiang;TIAN Wubian;WANG Dandan;ZHANG Peigen;CHEN Jian;SUN Zhengming(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;Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第5期627-637,共11页
Acta Metallurgica Sinica
基金
国家自然科学基金项目Nos.51731004
51671054和51501038
中央高校基本科研业务费项目Nos.2242018K40108和2242018K40109
江苏省自然科学基金项目No.BK20181285~~
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
metal-ceramic composite
electrical con tact material
MAX phase
microstructure
oxidation
electric arc erosion mechanism
