SnO2含量对AgCuOSnO2电接触性能的影响

Influence of SnO2 content on AgCuOSnO2 electrical contact preformance

摘要:

采用反应合成法制备了不同SnO2含量的AgCuOSnO2电接触材料。本文采用FQR-7501型涡流电导率仪测量抛光AgCuOSnO2的电导率。用扫描电镜(SEM)观察和研究了AgCuOSnO2电接触表面侵蚀形貌。JF04C直流数字电阻测试仪用于进行10000点测试。结果表明，AgCuO(10)SnO2(5)和AgCuO(10)SnO2(8)电触头材料在U=12V和I=15A时的接触电阻小于1.3mΩ，波动最小；当I=10A时，AgCuO(10)SnO2（x，x=2,5,8）的焊接力小于8cN，AgCuO(10)SnO2(5)电触头的焊接力较小当电流增大时稳定；当AgCuOSnO2电触头材料发生电弧烧蚀时，材料从阳极向阴极转移。随着SnO2含量的增加，材料传输过程中的损耗得到抑制和降低。所转移的电触头表面存在较少的气孔和微裂纹，表面形貌较为平坦。

Abstract:

AgCuOSnO₂ electrical contact materials with different SnO₂ contents were prepared by reaction synthesis. In this paper, FQR-7501 eddy current conductivity meter is used to measure the conductivity of the polished AgCuOSnO₂. The erosion morphology of the surface of the AgCuOSnO₂ electrical contact is observed and studied by Scanning Electron Microscope (SEM). The JF04C DC digital resistance tester is used to carry out 10000 dot tests. The results show that the contact resistance of AgCuO(10)SnO₂(5) and AgCuO(10)SnO₂(8) electric contact materials is lower than 1.3mΩ at U = 12V and I = 15A, and the fluctuation is the smallest; when I = 10A, the welding force of AgCuO(10)SnO₂ (x, x = 2,5,8) is less than 8cN, and the welding force of AgCuO(10)SnO₂(5) electric contact is small and stable when the current increases; when the arc erosion of AgCuOSnO₂ electric contact materials occurs, the material transfer way is from anode to cathode. With the increasing of SnO₂ content, the loss in the process of material transfer is restrained and reduced. There are little pores and microcracks on the surface of the transferred electrical contact, and the surface morphology is relatively flat.