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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

碳纳米管-TiB2陶瓷基复合材料的制备与性能研究

张幸红, 洪长青, 韩杰才, 张贺新, 孟松鹤, 曲伟   

  1. 哈尔滨工业大学复合材料与结构研究所, 哈尔滨 150001
  • 收稿日期:2005-07-08 修回日期:2005-09-09 出版日期:2006-07-20 网络出版日期:2006-07-20

Preparation and Properties of Titanium Diboride Ceramic Matrix Reinforced by Carbon Nanotubes

ZHANG Xing-Hong, HONG Chang-Qing, HAN Jie-Cai, ZHANG He-Xin, MENG Song-He, QU Wei   

  1. Center for Composite Materials and Structure, Harbin Institute of Technology,
    Harbin 150001, China
  • Received:2005-07-08 Revised:2005-09-09 Published:2006-07-20 Online:2006-07-20

PDF (PC)

2020

摘要： 研究了用热压烧结(HP)方法制备TiB2-xwt%CNTs-5wt%Ni(x=0.1、0.3、0.5、1、4)复合材料的工艺条件、力学性能和微观结构. 用XRD研究了其相组成, 用SEM观察了复合材料的断口形貌和裂纹扩展. 研究表明: 碳纳米管的加入使复合材料的硬度、弯曲强度和断裂韧性得到明显的提高, 并且在碳纳米管含量为0.5wt%左右时, 复合材料的硬度达到20.5GPa, 弯曲强度为496MPa, 断裂韧性达7.25MPa·m1/2; 断口形貌分析表明碳纳米管主要分布于TiB2颗粒的晶界处, 复合材料的增韧机制主要是碳纳米管的拔出机制和桥联机制.

关键词: 碳纳米管, TiB2陶瓷基复合材料, 力学性能, 微观组织

Abstract: TiB2-xwt%CNTs-5wt%Ni (x=0.1, 0.3, 0.5, 1, 4) composites reinforced by carbon nanotube were fabricated by hot-pressing sintering and the prepared conditions, mechanical properties and microstructure were also investigated. XRD and SEM were used to analyze the phase and fracture surface. The results show that the hardness, bending strength and fracture toughness of the composite reinforced by carbon nanotube are increased distinctly. When the carbon nanotube content is 0.5wt%, the bending strength attains 496MPa; moreover the value of hardness and fracture toughness reaches 20.5GPa and 7.25MPa·m1/2 respectively. The
analysis of fracture photograph reveals that the carbon nanotube mainly distributes at the TiB2 grain boundary. The main toughing mechanisms of the TiB2-CNTs-Ni composite are CNTs pulled-out and CNTs bridging.

Key words: carbon nanotube, TiB2 ceramic matrix composite, mechanical properties, microstructure

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