电弧对银金属氧化物(AgMeO)触头的熔炼和侵蚀特性

Smelting and Erosion Characteristics of AgMeO Contacts by Breaking Arcs

在快速试验机上对ＡｇＣｄＯ和ＡｇＳｎＯ２触头材料进行了大量分断电弧侵蚀试验．利用扫描电镜（ＳＥＭ）对熔层表面进行微观测试，并且利用能量扩散式Ｘ射线衍射仪（ＥＤＡＸ）对熔层表面进行成份分析、研究了熔层表面的微观组织结构，分析了触头气孔的形成机理和裂纹的产生原因与抑制途径，探讨了触头的耐电弧侵蚀能力与熔层组织结构的关系．研究发现，随着电弧作用次数的增加，银基触头材料熔层组织结构经历调整态和准稳定态两个阶段，准稳定态阶段中Ａｇ与第二相组元的含量比例稳定在一定范围．

The experiments for erosion behavior of AgCdO and AgSnO 2 contacts by breaking arcs were carried out in an accelerated testing machine. The surface of melting range was examined by SEM, and the element compositions of the surface were analyzed by EDAX. The microstructure and the composition of the surface of melting range are also analyzed. The hole and cracking mechanism is studied. Fianlly, the mechanism of arc erosion and microstructure and the composition of the surface of melting range is discussed. It is found that as the number of operation increases, the ratio of Ag to secondary component becomes much stable and only fluctuates in a certain range.