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采用Cu-Cr合金作阴极,φ3.2mm的纯W棒作阳极,在改制的真空室进行试验。通过计算Cu-25Cr合金的耐电压强度以及电压、电阻与距离的关系,测定了Cu-25Cr合金的电击穿性能,研究了RE含量对Cu-Cr合金电击穿性能的影响;分析试样的耐电压强度、电压和电阻与距离的关系及试验前后试样的显微组织,探讨了影响Cu-Cr合金电击穿性能的因素。结果表明,稀土元素的加入能够细化组织,从而提高Cu-Cr合金的耐电压强度和抗电弧腐蚀性能,改善Cu-Cr合金的电击穿性能。Cu-Cr合金的电击穿性能与电触头材料在空间中的电阻与距离的关系有关,当空间距离一定时,电触头材料间的电阻越大,它的耐电压强度越高。这可缩小电触头的起弧距离,满足Cu-Cr合金触头材料的电性能要求。
Using Cu-Cr alloy as the cathode, φ3.2mm pure W rod as the anode, in a modified vacuum chamber test. The electric breakdown strength of Cu-25Cr alloy was measured by calculating the relationship between the dielectric strength of Cu-25Cr alloy and the voltage, resistance and distance. The effect of RE content on the breakdown of Cu-Cr alloy was investigated. , The relationship between voltage and resistance and distance, and the microstructure of the samples before and after the test, the factors affecting the electrical breakdown performance of the Cu-Cr alloy were discussed. The results show that the addition of rare earth elements can refine the microstructure, thereby improving the withstand voltage strength and arc corrosion resistance of the Cu-Cr alloy and improving the electrical breakdown performance of the Cu-Cr alloy. The electrical breakdown behavior of Cu-Cr alloy is related to the resistance and distance of the electrical contact material in space. When the space distance is constant, the electrical resistance between the electrical contact materials is greater and the higher the withstand voltage strength is. This can reduce the arcing distance of the electrical contact, to meet the electrical properties of Cu-Cr alloy contact material requirements.