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- 2018
TiB2/Cu复合材料的电弧侵蚀行为
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Abstract:
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。 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. 国家自然科学基金（U1502274；51605146）；广东省金属强韧化技术与应用重点实验室（广东省材料与加工研究所）开放课题资助项目（GKL201601）
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