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- 2019
不同TiB2颗粒粒径的TiB2/Cu复合材料耐电弧侵蚀行为
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Abstract:
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。 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. 国家自然科学基金（U1502274；51605146）；河南省科技攻关计划（国际合作项目）（172102410046）；河南省创新科技团队（C20150014）；中国博士后科学基金资助项目（2018M632769
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