研究真空电弧的阴极现象,实际上是探索真空电弧的起源和本质,它的核心问题是分析阴极斑点现象。本文将从这方面进行论述。一、阴极斑点的形成一对电极在高真空中相互分离时,由于分离瞬间电极间的电场强度极高,将使间隙击穿,从而产生电弧。在产生电弧的瞬间,阴极表面就同时出现浮动的阴极斑点,它呈圆锥形向阳极扩张发光,锥顶角约为60°左右,并发射电子和金属蒸汽。此 Study of the cathode phenomenon of vacuum arc, in fact, to explore the origin and essence of vacuum arc, its core issue is to analyze the phenomenon of cathode spots. This article will be discussed in this area. First, the formation of cathode spots A pair of electrodes in a high vacuum separated from each other, due to the separation between the extremely high electric field strength between electrodes, the gap will break down, resulting in arc. At the moment of arc generation, a floating cathode spot appears on the surface of the cathode, which expands and glows conically toward the anode. The cone apex angle is about 60 ° and emits electrons and metal vapor. this