Effect of the microstructure of electrode materials on arc cathode spot dynamics
Effect of the microstructure of electrode materials on arc cathode spot dynamics
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DOI：
10.1088/0022-3727/36/21/008
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发表时间：
2003-11
期刊：
影响因子：
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通讯作者：
Yaping Wang;Chengyu Zhang;Hui Zhang;B. Ding;K. Lu
中科院分区：
文献类型：
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作者：
Yaping Wang;Chengyu Zhang;Hui Zhang;B. Ding;K. Lu
在研究无外磁场下真空电弧微观痕迹的基础上，研究了阴极材料微观结构对阴极斑几何参数和动态过程的影响。电弧烧蚀图案表明，点状弧坑位于耐压较弱的相上，其大小、形貌和分布决定了弧斑的大小、形态和分布。光斑在具有超细微观结构的阴极合金上追踪，分散到大大增加的电极面积，这表明光斑运动是由电极材料的微观结构控制的。提出的光斑动力学模型推断，当典型的微观结构尺度小于特征值（即光斑碎片尺寸）时，光斑速度可能会增加两个数量级。结论是，微观结构，包括组成相及其尺寸，是控制电弧阴极斑点微观迁移机制的重要因素。
The role of the microstructure of cathode materials in the geometrical parameters and dynamic processes of cathode spots is studied on the basis of investigation of the microscopic traces of vacuum arcs without an external magnetic field. The arc erosion pattern shows that spot craters locate on the phases with weak voltage withstanding, whose size, morphology and distribution determine those of the arc spots. The spot tracks over the cathode alloys with ultra-fine microstructure disperse to a greatly increased electrode area, suggesting that the spot motion is controlled by the microstructure of the electrode materials. A proposed spot dynamics model infers that the spot velocity may increase by two orders when the typical microstructure scale is less than a characteristic value, i.e. the spot fragment size. It is concluded that the microstructure, including the constituent phases and their size, is an important factor dominating the microscopic migration mechanism of arc cathode spots.