A Systematic Comparison of Intense-Mode Vacuum Arc Between CuCr and AgWC Electrode by Using Various Optical Diagnostics
A Systematic Comparison of Intense-Mode Vacuum Arc Between CuCr and AgWC Electrode by Using Various Optical Diagnostics
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DOI：
10.1109/tps.2020.2992675
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发表时间：
2020-06
影响因子：
1.5
通讯作者：
Y. Inada;R. Kikuchi;H. Nagai;Y. Yamano;M. Maeyama;H. Iwabuchi;A. Kumada;K. Hidaka;E. Kaneko
中科院分区：
文献类型：
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作者：
Y. Inada;R. Kikuchi;H. Nagai;Y. Yamano;M. Maeyama;H. Iwabuchi;A. Kumada;K. Hidaka;E. Kaneko
采用多种光学技术，主要包括测定电流为零后阳极温度的双色高温法、评估等离子体成分的发射光谱法以及同时进行二维电子和金属蒸汽密度成像的Shack-Hartmann方法，系统地比较了CuCr和AgWC电极之间与强模真空电弧中断相关的电极间现象。在电流峰值处，CuCr的径向电子密度分布宽度比AgWC窄。CuCr的电子密度是AgWC的3-5倍。在电流为零时，CuCr的金属蒸汽密度略低于AgWC，这一点在CuCr中得到了特别的证明，局部金属蒸汽密度低于最小可检测极限1020 m−3。电弧期间和电弧结束后，CuCr间隙中铜蒸气的混合比例比CuCr电极成分预期的高两倍左右。电流为零后，阳极表面金属气相密度的衰减时间常数为Cr < Cu < Ag。这一顺序与由阳极温度测量得到的阳极蒸发速率衰减时间常数一致。这种一致性表明，强真空电弧中断后金属蒸汽的供给过程是阳极表面的蒸发。
Interelectrode phenomena related to intense-mode vacuum arc interruption were systematically compared between CuCr and AgWC electrodes by using various optical techniques mainly including two-color pyrometry for anode temperature determination after current zero, optical emission spectroscopy for the plasma composition assessment, and a Shack–Hartmann method for simultaneous 2-D electron and metal vapor density imaging. At the current peak, the widths of the radial electron density distributions for CuCr were narrower than those for AgWC. The electron density for CuCr was 3–5 times higher than that for AgWC. At current zero, the metal vapor density for CuCr was slightly lower than that for AgWC, which was specifically demonstrated for CuCr by a locally reduced metal vapor density below the minimum detectable limit of 1020 m−3. During and after the arcing time, mixing ratios of the copper vapor existing in the CuCr gap was about two times higher than expected from the CuCr electrode composition. After current zero, the decaying time constants of the metal vapor densities on the anode surfaces were Cr < Cu < Ag. This order was consistent with the decaying time constants of the anode evaporation rates estimated from the anode temperature measurement. The consistency suggests that the supplying process of the metal vapor after the intense vacuum arc interruption was the evaporation of the anode surfaces.