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银—氧化镉合金电触头材料在分断大电流时会发生电流过零后的电弧重燃。这个现象在第一次分断时更加容易发生,有时燃弧时间过长而使触头烧毁。至今还未见到为什么第一次分断容易重燃的解释。本研究发现了银—氧化镉合金的表层组织异常。藉俄歇电子能谱、离子探针质谱以及金相显微镜等手段对材料作了分析,并与分断试验结果对照,发现表层中低电离电势元素的聚集以及众多的缺陷是造成第一次分断时电弧容易重燃的重要原因。
Silver - cadmium alloy electrical contact material in the breaking of high current occurs after the current zero-crossing arc reignition. This phenomenon is more prone to occur on the first break, and sometimes the arcing time is too long to burn the contacts. So far still not seen why the first break easily rekindled explanation. This study found that the surface of silver-cadmium oxide alloy abnormalities. The materials were analyzed by Auger electron spectroscopy, ion-exchange mass spectrometry and metallographic microscope, and compared with the breaking test results, it was found that the aggregation of low ionization potential elements in the surface layer and many defects caused the first break Arc easy to re-ignition of the important reasons.