新型AgZrB2 触头材料的制备及电气性能

Preparation and Electrical Characteristics of Novel AgZrB2 Contact Materials

摘要:

采用超声、球磨和放电等离子烧结相结合的方法制备了不同ZrB₂含量（3%，5%，7%，质量分数）的新型AgZrB₂触头材料，并通过电接触试验研究了触头材料的电弧侵蚀和材料转移行为。结果表明，ZrB₂含量显著影响AgZrB₂触头材料的耐电弧侵蚀性能。Ag-3% ZrB₂触头材料具有稳定的闭合/分断燃弧能量和持续时间，表现出较好的耐电弧侵蚀性能。但是，过多的ZrB₂会导致更高的闭合燃弧能量和更长的闭合燃弧时间，并且分断燃弧能量和时间会产生较大的波动，电弧侵蚀较为严重，这说明过量的ZrB₂不利于提高触头材料的耐电弧侵蚀性能。此外，Ag-3% ZrB₂和Ag-5% ZrB₂触头材料具有相同的材料转移模式——从阳极向阴极转移，而Ag-7% ZrB₂触头材料则呈现出相反的转移模式——从阴极向阳极转移。

Abstract:

The novel AgZrB₂ electrical contact materials with different ZrB₂ contents were prepared by the combination method of ultrasonication, ball milling, and spark plasma sintering, and the arc erosion and material transfer behavior were investigated by the electrical contact tests. The results show that the ZrB₂ content significantly affects the arc erosion resistance of AgZrB₂ electrical contact materials. The Ag-3wt% ZrB₂ contact material presents the stable make/break-arc energy and duration, indicating the excellent arc erosion resistance. However, the increased ZrB₂ content results in higher make-arc energy and longer make-arc duration with large fluctuations of break arc energy and duration, leading to the severe arc erosion. This result suggests that the excessive ZrB₂ is not beneficial to the enhancement of arc erosion resistance. Moreover, it is found that the Ag-3wt% ZrB₂ and Ag-5wt% ZrB₂ contact materials have the same material transfer mode from anode to cathode, whereas the Ag-7wt% ZrB₂ contact material has the opposite transfer mode from cathode to anode.