AgCuO电触头材料的接触电阻及电弧侵蚀形貌分析

Contact Resistance and Arc Erosion Morphology of AgCuO Electrical Contact Material

摘要:

采用原位反应合成法制备CuO含量为10%的AgCuO电触头材料，使用接触电阻参数测试仪对试样在不同电流条件下开闭次数与接触电阻的关系进行研究，并通过扫描电镜对试样的阴/阳极表面微观形貌进行电侵蚀特性分析。结果表明，低电流条件下AgCuO电触头材料的接触电阻基本都是先升高，然后在某一开闭次数时急剧下降，最后基本趋于一定值，且AgCuO电触头材料接触电阻会随着试验电流的增加而逐渐降低；当电流达到25A时，AgCuO电触头材料的接触电阻最低，且随开闭次数的增加其接触电阻变化不大，材料的接触电阻表现出极佳的稳定性。电弧侵蚀后的形貌分析发现，阳极表面呈凹凸状，并有气孔和裂纹，而阴极表面呈现浆糊状尖峰结构。

Abstract:

Silver copper oxide composites were prepared by the in-situ synthesized method. The relationship between the number of tests and the contact resistance under different conditions of DC arc were studied by a contact resistance parameter tester. The sample surface morphology changes were analyzed by scanning electron microscopy (SEM). The results show that the contact resistance of AgCuO electrical contact material presents an elevated trend in the early time, then decreases at a certain number of test times and reaches a saturation value at last. In the experiment, the contact resistance of AgCuO electrical contact material decreases as the test current increases. When the current reaches 25 A, the contact resistance of AgCuO electrical contact materials exhibits the lowest value, and with the increase in the number of tests, the contact resistance changes a little, the material exhibits excellent stability in contact resistance. By analyzing the contact morphology features after arc erosion, it is found that there are obvious differences between the anode and the cathode contact surface morphology, the surface of the anode showing a concave convex shape with some cracks and pores and the cathode contact surface showing paste peak.