多粒径TiB2/Cu复合材料耐电弧侵蚀行为

采用粉末冶金工艺制备了不同配比的多粒径(2 μm+10 μm+50 μm) TiB₂/Cu复合材料。通过JF04C触点材料测试系统对多粒径TiB₂/Cu复合材料进行耐电弧侵蚀性能试验，研究(2 μm+10 μm+50 μm) TiB₂颗粒质量比分别为1∶1∶1、1∶1∶3、1∶3∶1、3∶1∶1时，TiB₂/Cu复合材料的耐电弧侵蚀性能及电弧侵蚀形貌变化规律，探究多粒径配比对TiB₂/Cu复合材料表层耐电弧侵蚀行为的影响。结果表明:当(2 μm+10 μm+50 μm) TiB₂颗粒质量比为1∶1∶1时，TiB₂/Cu复合材料相对密度和导电率最高，分别为99.1%和87.1%IACS。当(2 μm+10 μm+50 μm) TiB₂颗粒质量比为1∶1∶1和1∶3∶1时，TiB₂/Cu复合材料的组织均匀性较好，电弧侵蚀后材料损失相同，材料转移量最少。其中，质量比为1∶3∶1时，TiB₂/Cu复合材料平均燃弧能量最低，且燃弧时间和燃弧能量最稳定。研究表明，这与复合材料的综合物理性能密切相关。在颗粒增强Cu基复合材料设计过程中，引入合适配比的多粒径TiB₂颗粒有助于提高TiB₂/Cu复合材料的密度、导电率等综合物理性能。电弧侵蚀过程中，不同粒径的TiB₂颗粒相互协同作用，有助于提高TiB₂/Cu复合材料的耐电弧侵蚀性能和服役稳定性。 

Arc erosion behavior of multi-particle TiB2/Cu composite

TiB₂/Cu composites with multi-particle (2 μm+10 μm+50 μm) were prepared by powder metallurgy. The arc erosion resistance of multi-particle TiB₂/Cu composites was tested in a JF04C contact material testing system. The arc erosion resistance and morphology of TiB₂/Cu composites were studied when the mass ratios of TiB₂ particles (2 μm+10 μm+50 μm) were 1∶1∶1, 1∶1∶3, 1∶3∶1 and 3∶1∶1, respectively. The results show that when the (2 μm+10 μm+50 μm) TiB₂ particle mass ratio is 1∶1∶1, the TiB₂/Cu composite has the highest relative density and conductivity of 99.1% and 87.1%IACS, respectively. When the (2 m+10 m+50 m) TiB₂ particle mass ratio are 1∶1∶1 and 1∶3∶1, the structure uniformity of the TiB₂/Cu composites is better, the material loss is the same after arc erosion, and the material loss of the TiB₂/Cu composite is lower than the composites with other ratios. When the ratio is 1∶3∶1, the TiB₂/Cu composite has the lowest average arc energy, and the arc duration and arc energy are the most stable. It can be concluded that the introduction of appropriate multi-particle TiB₂ particles into Cu matrix can improve the density and electrical conductivity of the TiB₂/Cu composites. In the process of arc erosion, TiB₂ particles with different sizes cooperate with each other, which is helpful to enhance the arc erosion resistance and service stability of the TiB₂/Cu composites.