CNTs添加对Cu-Al2O3复合材料耐电弧侵蚀性能的影响

Cu-Al₂O₃复合材料具有优异的传导性能和力学性能，在耐磨材料领域具有广阔的应用前景。为进一步提升电摩擦条件下复合材料的耐电弧侵蚀性能，本文采用内氧化法与粉末冶金法相结合制备了不同碳纳米管(CNTs)含量的CNTs/Cu-Al₂O₃复合材料，观察了CNTs/Cu-Al₂O₃复合材料中增强相的分布及其与基体界面结合情况，研究了添加不同含量CNTs对Cu-Al₂O₃复合材料传导性能和力学性能的影响，重点探究了CNTs/Cu-Al₂O₃复合材料的耐电弧侵蚀机制。结果表明：原位生成的纳米Al2O3颗粒钉扎位错及对CNTs分布具有调控作用，使CNTs弥散分布在铜基体中。与Cu-Al₂O₃复合材料相比，CNTs/Cu-Al₂O₃复合材料燃弧时间和燃弧能量明显降低，波动更平稳。在电弧侵蚀过程中，...

Arc erosion resistance of Cu-Al2O3 composite effected by CNTs

Cu-Al₂O₃ composite has excellent conductivity and mechanical properties, and it widely used in the field of wear-resistant materials. In order to further improve the arc erosion resistance of composite under the condition of electro-friction, CNTs/Cu-Al₂O₃ composites with different contents of carbon nanotubes (CNTs) were prepared by internal oxidation combining with powder metallurgy. The distribution of reinforcing phase and the interface between CNTs and matrix in CNTs/Cu-Al₂O₃ composites were observed. The conductivity and mechanical properties of Cu-Al₂O₃ composites effected by CNTs were studied. The arc erosion resistance mechanism of CNTs/Cu-Al₂O₃ composites was mainly explored. The results show that in-situ nano-Al₂O₃ particles pin dislocation, CNTs are dispersed in the copper matrix due to the regulation of CNTs distribution by Al₂O₃ particles. Compared with Cu-Al₂O₃ composites, the arc duration and energy of CNTs/Cu-Al₂O₃ composites are obviously reduced and fluctuate more stable. In the process of arc erosion, CNTs in the molten pool will float to the surface to disperse the arc and reduce the concentrated erosion area. Nano-Al₂O₃ particles can stabilize the molten pool, reduce the splash of molten droplets and the mass loss of CNTs/Cu-Al₂O₃ composites. Among them, CNTs/Cu-3.5Al₂O₃ composites with 1.2vol%CNTs has the lowest and most stable arc duration and energy. This research result provides a favorable theoretical basis for the research of ablation resistant materials.