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碳纳米管-TiB2陶瓷基复合材料的制备与性能研究
  • 期刊名称：无机材料学报, 2006, 21(4): 899-905
  • 时间：0
  • 分类：TB333[一般工业技术—材料科学与工程]
  • 作者机构：[1]哈尔滨工业大学复合材料与结构研究所,哈尔滨150001
  • 相关基金：再制造国防科技重点实验室基金（51489020505HT01）;国家自然科学基金重点项目（90505015）
  • 相关项目：非烧蚀防热机理与材料的设计、制备和表征
关键词： 碳纳米管, TiB2陶瓷基复合材料, 力学性能, 微观组织, carbon nanotube, TiB2 ceramic matrix composite, mechanical properties, microstructure
中文摘要：

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．

英文摘要：

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.

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期刊论文 89 会议论文 24
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