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采用真空烧结熔渗法制备不同Cr2Nb含量的Cr2Nb/CuCr复合材料。通过XRD和SEM研究复合材料的组织结构,采用SEM和高速摄影研究原位合成的Cr2Nb对复合材料表面电弧运动及表面烧蚀形貌的影响。结果表明:随着Cr-Nb复合粉末添加量的增加,Cr2Nb/CuCr复合材料的硬度、电导率、截流值、电弧寿命和耐电压强度均有明显改善,当Cr-Nb复合粉末的添加量为7%(质量分数)时,Cr2Nb/CuCr复合材料的阴极斑点更为分散,截流值显著降低,电弧寿命明显延长。与常规CuCr合金性能相比,Cr2Nb/CuCr复合材料表现出较好的综合性能。
Cr2Nb / CuCr composites with different content of Cr2Nb were prepared by vacuum sintering infiltration method. The microstructure of the composites was investigated by XRD and SEM. The effects of the in-situ synthesized Cr2Nb on the arc motion and surface ablation morphology of the composites were investigated by SEM and high-speed photography. The results show that the hardness, electrical conductivity, cutoff value, arc life and voltage withstanding strength of Cr2Nb / CuCr composites are obviously improved with the addition of Cr-Nb composite powder. When the amount of Cr-Nb composite powder is 7% (mass fraction), Cr2Nb / CuCr composite cathode spot is more dispersed, the cutoff value was significantly reduced, the arc life was significantly longer. Compared with conventional CuCr alloy, Cr2Nb / CuCr composite showed better overall performance.