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›› 2012, Vol. 12 ›› Issue (6): 1048-1052.

• 材料工程专栏 • 上一篇    下一篇

热解炭微观结构对炭/炭复合材料力学性能的影响

王向辉 翁力 于守泉   

  1. 北京低碳清洁能源研究所 北京低碳清洁能源研究所 中国科学院过程工程研究所
  • 收稿日期:2012-10-30 修回日期:2012-11-20 出版日期:2012-12-20 发布日期:2012-12-20
  • 通讯作者: 王向辉

Effect of Pyrocarbon Matrix Micro-structure on Mechanical Properties of C-C Composites

WANG Xiang-hui WENG Li YU Shou-quan   

  1. National Institute of Clean and Low Carbon Energy National Institute of Clean and Low Carbon Energy National Institute of Clean and Low Carbon Energy
  • Received:2012-10-30 Revised:2012-11-20 Online:2012-12-20 Published:2012-12-20
  • Contact: WANG Xiang-hui

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被引次数

3

摘要： 以PAN基针刺纤维毡为基体，采用等温化学气相渗透技术，在温度1000℃、压力5.0~20.0 kPa条件下制备了2种具有不同微观结构热解炭的炭/炭复合材料，研究了其力学性能与热解炭微观结构的关系. 结果表明，压力8.0 kPa下得到的具有单一低织构热解炭的炭/炭复合材料的断裂强度较高，为86±3 MPa，热解炭与炭纤维间界面结合紧密，加载过程中二者同时断裂，呈现明显的脆性断裂行为；压力10.0~20.0 kPa下得到的具有中织构-高织构-中织构热解炭的炭/炭复合材料的断裂强度稍低，为82±4 MPa，加载过程中材料内部不同织构热解炭间多层次界面通过改变裂纹扩展路径而延缓其扩展速度，断口形貌呈现锯齿状，表现出假塑性断裂特征.

关键词: 炭/炭复合材料, 热解炭, 微观结构, 力学性能

Abstract: The carbon-carbon (C-C) composites with different pyrocarbon matrix micro-structure were obtained using PAN based carbon fiber felts infiltrated by isothermal chemical vapor infiltration (CVI) under the conditions of 1000℃ and 5.0~20.0 kPa, and the effect of pyrocarbon micro-structure on the composites mechanical properties was studied. It was found that the C-C composite with monolayer lower texture prepared under 8.0 kPa displays higher breaking strength and obvious brittle fracture behavior for the stronger interface force between pyrocarbon and carbon fiber, which lead to the breaking simultaneously as loading. While the C-C composite with medium texture-high texture-medium texture prepared under 10.0~20.0 kPa shows good mechanical properties and the pseudo-plastic failure behavior, which is related to multiple crack deflections caused by the interfacial sliding between different pyrocarbon layers with a varying texture degree and the delamination micro-cracking within the highly textured pyrocarbon layer. The breaking strength of the materials reaches to 86±3 and 82±4 MPa, respectively.

Key words: C-C composite, pyrocarbon, micro-structure, mechanical property