CNTs添加对Cu-Al_(2)O_(3)复合材料耐电弧侵蚀性能的影响  

Arc erosion resistance of Cu-Al_(2)O_(3)composite effected by CNTs

作　　者：杨豫博 国秀花 宋克兴 李韶林 米绪军 李周[3] YANG Yubo;GUO Xiuhua;SONG Kexing;LI Shaolin;MI Xujun;LI Zhou(Key Laboratory of Materials Science&Processing Technology for Non-ferrous Metals of Henan,Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Research Institute of Engineering Technology CO.,LTD.,Beijing 100088,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]河南科技大学材料科学与工程学院,有色金属共性技术河南省协同创新中心,河南省有色金属材料科学与加工技术重点实验室,洛阳471023 [2]有研工程技术研究院有限公司,北京100088 [3]中南大学材料科学与工程学院,长沙410083

出　　处：《复合材料学报》2023年第1期280-289,共10页Acta Materiae Compositae Sinica

基　　金：河南省重点研发与推广专项(212102210110);河南省高等学校青年骨干教师计划项目(2018GGJS045);中国工程发展战略河南研究院战略咨询研究项目(2021HENZDA02);中国博士后科学基金(2020T130172,2020M682288)。

摘　　要：Cu-Al_(2)O_(3)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-Al_(2)O_(3)复合材料,观察了CNTs/Cu-Al_(2)O_(3)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-Al_(2)O_(3)复合材料传导性能和力学性能的影响,重点探究了CNTs/Cu-Al_(2)O_(3)复合材料的耐电弧侵蚀机制。结果表明:原位生成的纳米Al_(2)O_(3)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-Al_(2)O_(3)复合材料相比,CNTs/Cu-Al_(2)O_(3)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,熔池中的CNTs会上浮至表面分散电弧,减小集中侵蚀区域;纳米Al_(2)O_(3)颗粒可以稳定熔池,减小熔融液滴的喷溅,有效减小CNTs/Cu-Al_(2)O_(3)复合材料质量损失。其中添加1.2vol%CNTs的CNTs/Cu-3.5Al_(2)O_(3)复合材料的燃弧时间和燃弧能量最低、最稳定。这一研究结果对耐烧蚀材料的研究提供有利的理论依据。Cu-Al_(2)O_(3) 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-Al_(2)O_(3) 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-Al_(2)O_(3) composites were observed.The conductivity and mechanical properties of Cu-Al_(2)O_(3) composites effected by CNTs were studied.The arc erosion resistance mechanism of CNTs/Cu-Al_(2)O_(3) composites was mainly explored.The results show that in-situ nano-Al_(2)O_(3) particles pin dislocation,CNTs are dispersed in the copper matrix due to the regulation of CNTs distribution by Al_(2)O_(3) particles.Compared with Cu-Al_(2)O_(3) composites,the arc duration and energy of CNTs/Cu-Al_(2)O_(3) 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-Al_(2)O_(3) particles can stabilize the molten pool,reduce the splash of molten droplets and the mass loss of CNTs/Cu-Al_(2)O_(3) composites.Among them,CNTs/Cu-3.5Al_(2)O_(3) 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.

关 键 词：碳纳米管(CNTs) 金属基复合材料 显微结构 电弧侵蚀 稳定熔池 Cu 纳米Al_(2)O_(3)颗粒 

分 类 号：TB331[一般工业技术—材料科学与工程]