直流负载下触头的电侵蚀特性分析有助于深入研究其电弧侵蚀机理。通过对 Cu-Cr-Zr-Ag合金触头进行电性能实验，研究了25 V/15 A直流负载条件下，合金触头的电侵蚀情况。采用电接触试验机和扫描电镜，研究了合金材料的电弧侵蚀机理，表面形貌，微观结构和材料转移现象。结果表明：Cu-Cr-Zr-Ag 合金触头具有优异的抗熔焊性能，合金触头的电弧侵蚀微观形貌表现为浆糊状凝固物和气泡，且在触头侵蚀表面存在微裂纹。直流负载条件下动静触头间会发生明显的材料转移现象。
The analysis of electrical erosion characteristics of contacts under DC load is conducive to the in-depth study of the electrical erosion mechanism. The electrical experiments on the electrical erosion status of the Cu-Cr-Zr-Ag alloy contacts under DC load of 25 V/15 A and the electrical erosion mechanism were carried out by electrical contact test machine and SEM. The surface micromorphologies, microstructures and material transfer phenomenon of the contacts were studied in this paper. The results showed that the Cu-Cr-Zr-Ag contacts have excellent anti-welding properties. The electrical erosion surfaces of the material showed a large number of paste-like coagulum and bubbles. There are some micro-cracks existing on the surface of the Cu-Cr-Zr-Ag alloy contacts. The obvious material transfer phenomenon occurs between the movable and static contacts under DC load.
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