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 fine-grained and coarse-grained CuW70 alloys were prepared by sintering and infiltrating.The motion of cathode spots was observed by a digital high speed video camera and a scanning electron microscope(SEM).The results show that the fine-grained CuW70 alloy has larger breakdown strength,longer average arc life and lower chopping current.For coarse-grained CuW70 alloy,the cathode spots ignite and extinguish alternately beneath the anode,the breakdown is mainly located on copper phase,and the erosion pits are much deeper.However,the cathode spots of fine-grained CuW70 alloys have the characteristics of division and deviation,with the uniform distribution ofthe erosion pits on the entire cathode surface.
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