不同Bi含量的开关柜CuCr40合金触头材料制备及电弧行为研究

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Abstract： In this study，high-energy ball milling and spark plasma sintering （SPS） were employed to fabricate CuCr40 electrical contact materials with varying Bi contents.The hardnes，conductivity，density，surface arc motion behavior，and erosion morphology of the contacts were characterized，and their arc erosion resistance properties were analyzed. The results indicate that CuCr alloys doped with 2.5wt.% and 7.5wt.% Bi meet the fundamental performance requirements for contact materials.Following vacuum cathode discharge，the cathode of the 7.5wt.% Bi-doped contact exhibited a larger spot area and shallower ablation zone，demonstrating superior arc dispersion characteristics.Additionally，no significant ablative pitsor cracks wereobserved in theBi-doped contactsafterarc ablation.These findings suggest that CuCr contacts doped with 7.5wt.% Bi possess excellent arc motion and arc erosion resistance.

Keywords：switch cabinet;CuCr contact;arc erosion;arc breakdown

1 序言

高压开关柜用于电能的推送和分配，是确保高压系统得以安全运转的重要设备，在整个供电系统中扮演着至关重要的角色[1]。（剩余9517字）