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采用沉淀法制备出平均粒径约90 nm的Cu-CeO2粉末。将所得的纳米复合Cu-CeO2粉末经真空热压工艺处理制成纳米复合Cu-CeO2阴极。利用SEM及XRD分析方法对其显微组织进行了研究,结果显示:用沉淀法制备的Cu-CeO2阴极组织较均匀,CeO2粒子晶粒大多在100 nm,呈长圆状分布在Cu基体中。真空电弧实验研究表明纳米复合Cu-CeO2阴极击穿点分布在阴极表面的大部分面积上,阴极斑点细小分散,且击穿优先发生在CeO2相上,导致表面烧蚀较常规材料轻微。
A Cu-CeO2 powder with an average particle size of about 90 nm was prepared by precipitation method. The resulting nanocomposite Cu-CeO2 powder by vacuum hot pressing process nanocomposite Cu-CeO2 cathode. The microstructure was studied by SEM and XRD. The results showed that the cathode of Cu-CeO2 prepared by precipitation method was more uniform and the grains of CeO2 particles were mostly at 100 nm, which were elongated and distributed in Cu matrix. The experimental results of vacuum arc experiments show that the cathode breakdown points of nanocomposite Cu-CeO2 are distributed on most of the cathode surface, and the cathode spots are finely dispersed, and the breakdown occurs preferentially on the CeO2 phase, resulting in the surface ablation being less than the conventional material.