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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。
Analysis of the electrical erosion characteristics of the contact under DC load is helpful to further study its arc erosion mechanism. The electrical erosion experiments of Cu-Cr-Zr-Ag alloy contacts under 25 V / 15 A direct current load were studied. The electric arc erosion mechanism, surface morphology, microstructure and material transfer phenomenon of the alloy material were studied by using electrical contact tester and scanning electron microscope. The results show that the Cu-Cr-Zr-Ag alloy contact has excellent anti-welding performance. The micro-morphology of the arc erosion of the alloy contact shows paste-like coagulation and bubbles, and there are micro-cracks on the contact erosion surface. Significant material transfer occurs between static and dynamic contacts under DC load conditions.