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以不同粒度的W粉为原料,采用熔渗法制备CuW70合金,在真空灭弧室模拟电烧蚀实验,通过高速摄影仪和扫描电镜研究CuW70合金表面阴极斑点运动规律。研究结果表明:W粉粒度较小的CuW70合金具有较高的耐电压强度、较长的燃弧时间和低的截留值。W粉粒度较大的CuW70合金真空阴极斑点运动表现为在阳极正下方反复地重复燃烧,并且以选择Cu相击穿为主,烧蚀坑较深;W粉粒度较小的CuW70合金表面阴极斑点在阳极下方出现分裂和偏移,击穿相分布于整个阴极表面。
The CuW70 alloy was prepared by melt infiltration method with different particle size of W powder as raw material. The experiment of simulated electric ablation was carried out in vacuum interrupter. The motion of cathode spot on CuW70 alloy was studied by high-speed camera and scanning electron microscope. The results show that CuW70 alloy with smaller grain size of W powder has higher dielectric strength, longer arcing time and lower cut-off value. W CuW70 alloy powder with larger particle size showed negative repeated motions just below the anode, and mainly selected Cu phase breakdown. The ablation pit was deeper; the surface of CuW70 alloy with smaller particle size was negative In the anode below the split and offset, the breakdown phase distribution in the entire cathode surface.