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为了研究不同粒度TiB_2对Ag-TiB_2复合材料电弧侵蚀行为的影响,通过机械球磨和粉末冶金的方法制备不同粒度的TiB_2增强Ag-4%TiB_2(质量分数)复合材料。对Ag-4%TiB_2复合材料的组织进行了分析,定量分析了TiB_2的分布。用TDR240A单晶炉改装的设备进行真空电弧侵蚀实验,采用扫描电子显微镜(SEM)表征了电弧侵蚀后试样表面形貌,测量了电弧侵蚀前后的质量损失,采用TDS-2014双通道数字示波器记录了每次电弧的持续时间,并且对电弧侵蚀机理进行了讨论。结果显示,随着TiB_2颗粒粒度的减小,TiB_2颗粒在Ag基体分布更均匀,Ag-4%TiB_2触头材料表现出小的质量损失,短的电弧持续时间,大的侵蚀区域以及浅的侵蚀坑。说明了细小TiB_2颗粒更能有效改善Ag-4%TiB_2触头材料的耐电弧侵蚀性能。
In order to study the effect of different particle sizes of TiB 2 on arc erosion of Ag-TiB 2 composites, TiB 2 reinforced Ag-4% TiB 2 (mass fraction) composites were prepared by mechanical milling and powder metallurgy. The microstructure of Ag-4% TiB 2 composite was analyzed and the distribution of TiB 2 was quantitatively analyzed. Vacuum arc erosion test was carried out on the equipment modified by TDR240A single crystal furnace. The surface morphology of the sample after arc erosion was characterized by scanning electron microscope (SEM). The mass loss before and after arc erosion was measured. TDS-2014 dual-channel digital oscilloscope was used to record The duration of each arc was discussed and the arc erosion mechanism was discussed. The results show that with the decrease of TiB 2 particle size, the distribution of TiB 2 particles in Ag matrix is more uniform, the Ag-4% TiB 2 contact material shows small mass loss, short arc duration, large erosion area and shallow erosion pit. It is demonstrated that the fine TiB 2 particles can effectively improve the arc erosion resistance of Ag-4% TiB 2 contact materials.