非晶、纳米晶电极材料表面的电弧行为规律

he reason for electrode erosion, welding and the failure of electric apparatuses comes mainly from the low velocity movement of arc cathode spots. Seldom attention was paid on the effect on cathode spots of microstructure of cathode materials, such as grain size, phase, and the distribution of second phases. In this paper the arc characteristics over the surface of several amorphous or nanostructured materials were investigated. Some new arc characteristics, such as electron emission sites, arc spot propagation and distribution, were found. It is concluded that the microstructure superfining of electrode materials can induce the abnormal arc feature, which may be used to control the arc behavior.