TiB2/Cu复合材料的电弧侵蚀行为

采用放电等离子烧结法（SPS）制备TiB₂质量分数为1wt%~5wt%的TiB₂/Cu复合材料，测试其导电率和硬度。当TiB₂质量分数由0增至5wt%时，复合材料的导电率由96.9%（International Annealed Copper Standard，IACS）降至65.1%（IACS），布氏硬度由42.8增至65.2。对所制备的不同TiB₂质量分数的TiB₂/Cu复合材料在直流24 V、不同电流条件下进行电接触实验，探究TiB₂添加量和电流对TiB₂/Cu复合材料耐电弧侵蚀性能的影响。结果表明，TiB₂/Cu复合材料的平均燃弧时间、平均燃弧能量和材料损耗量随着电流的增加而增加，TiB₂/Cu复合材料的阴极损耗量高于阳极，整体上TiB₂/Cu复合材料由阴极向阳极转移。在24 V和25 A条件下，不同TiB₂质量分数的TiB₂/Cu复合材料的燃弧时间和燃弧能量随操作次数增加不断波动，整体上呈逐渐增加的趋势，3wt% TiB₂/Cu复合材料的稳定性最高，平均燃弧时间和燃弧能量最低。随着TiB₂质量分数的增加，TiB₂/Cu复合材料损耗量降低，表面蚀坑变浅。

Arc erosion behavior of TiB2/Cu composites

The TiB₂/Cu composites with TiB₂ mass fraction of 1wt%-5wt% were prepared by spark plasma sintering (SPS), and the electrical conductivity and hardness were tested. The electrical conductivity of TiB₂/Cu composites decreases from 96.9% (International Annealed Copper Standard, IACS) to 65.1%(IACS) with TiB₂ mass fraction increasing from 0 to 5wt%, while the Brinell hardness increases from 42.8 to 65.2. To discuss the effect of TiB₂ content and current on TiB₂/Cu composites arc erosion, the electrical contact tests were performed at 24 V and different direct current for TiB₂/Cu composites with the different TiB₂ mass fractions. For TiB₂/Cu composites with different TiB₂ mass fraction, the average arc duration, average arc energy and mass loss increase with the increase of current. The cathode of TiB₂/Cu composites mass loss more than that of the anode. In general, the TiB₂/Cu composites are transferred from cathode to anode. At 24 V and 25 A, the arc duration and arc energy of TiB₂/Cu composites with different TiB₂ mass fractions are fluctuant with the increase of operation times. On the whole, it shows a tendency to increase gradually. The 3wt% TiB₂/Cu composite has higher stability, the average arc duration and average arc energy are lower than the others. With the increase of mass fraction of TiB₂, TiB₂/Cu composites present less mass loss and shallower arc erosion pits.