不同TiB2颗粒粒径的TiB2/Cu复合材料耐电弧侵蚀行为

采用放电等离子烧结法（SPS）制备了不同TiB₂颗粒粒径的3wt% TiB₂/Cu复合材料，研究了3wt% TiB₂/Cu复合材料致密度、导电率、硬度和耐电弧侵蚀性能随TiB₂颗粒粒径的变化规律，重点分析了不同TiB₂颗粒粒径的3wt% TiB₂/Cu复合材料耐电弧侵蚀行为。结果表明:3wt% TiB₂/Cu复合材料致密度和硬度随TiB₂颗粒粒径的增大而略有降低；TiB₂颗粒粒径越小，TiB₂/Cu复合材料的综合性能越好。随着TiB₂颗粒粒径的增大，3wt% TiB₂/Cu复合材料耐蚀稳定性降低，3wt% TiB₂/Cu阴极材料的损耗量明显增加；当TiB₂颗粒粒径为10 μm时，3wt% TiB₂/Cu复合材料的耐电弧侵蚀性能最佳。电弧蚀形貌观察表明:不同TiB₂颗粒粒径的3wt% TiB₂/Cu复合材料经电弧侵蚀后，3wt% TiB₂/Cu复合材料均由阴极向阳极发生转移；随着TiB₂颗粒粒径的增大，阴极质量损耗逐渐增加，触头表面电弧侵蚀面积增加；而在Cu基体中引入较小的TiB₂颗粒，有利于减弱电接触实验过程中TiB₂/Cu复合材料的喷溅现象。 

Arc erosion behavior of TiB2/Cu composites reinforced withdifferent sized TiB2 particles

The 3wt%TiB₂/Cu composites reinforced with different sized TiB₂ particles were prepared by spark plasma sintering (SPS). The variations of density, electrical conductivity, hardness and arc resistance of 3wt%TiB₂/Cu composites with the TiB₂ particle size were studied, and arc erosion behavior of the TiB₂/Cu composites reinforced with different sized TiB₂ particles were emphatically analyzed. The results show that the hardness and density of 3wt%TiB₂/Cu composite decrease gently with increasing of TiB₂ particles size. The comprehensive performance of 3wt%TiB₂/Cu composite with fine TiB₂ particle size is better. With the increase of TiB₂ particles size, the stability of the arc erosion resistance of 3wt%TiB₂/Cu composites decreases, and the mass loss of 3wt%TiB₂/Cu composites cathode material increases. The arc erosion resistance of 3wt%TiB₂/Cu composite reinforced with 10 μm TiB₂ particles is optimal. Observations on arc erosion morphology show that 3wt%TiB₂/Cu composites are mostly transferred from cathodes to anodes, and the mass loss of cathode and arc erosion area on the contact surface increase gradually with increasing of the TiB₂ particle size, which shows that the fine TiB₂ particles in Cu matrix can reduce the splashing of molten copper during arc erosion.