纤维增韧碳化硅陶瓷基复合材料的界面区研究 - 沈阳材料科学国家 ...

·1544· 稀 有 金 属 材 料 与 工 程 第 36 卷
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Interfacial Zone in Continuous Fiber-Reinforced Ceramic Composites
Li Jianzhang 1, 2 , Zhang Litong 1 , Cheng Laifei 1 , Xu Yongdong 1 , Li Douxing 2
(1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi’an 710072, China)
(2. Institute of Metal Research, CAS, Shenyang 110016, China)
Abstract: A special area with certain thickness located between matrices and fibers is defined as ‘interfacial zone’ in this paper, which
consists of a bulk phase (often called as interphase) and two interfaces, that is, the interphase/matrix interface and the interphase/fibre
interface. The interactions between interfacial zone and matrix cracks are studied by transmission electron microscopy (TEM). It is found
in the 3D C/SiC continuous fiber-reinforced ceramic composites (CFCC) that three kinds of interactions, i.e., the single and multiple
deflection of matrix cracks, the debond or second cracks induced by the stress concentration ahead of matrix cracks tip, and the microcrack
bridging mechanism at the nanometric scale, are observed at various places within and around the interfacial zone due to the evolvement
of crack deflection/penetration competition. The analysis shows that these behaviors and their places are determined both by the toughness
of correlative interfaces or fracture in the interfacial zone. Besides, some models are proposed for these interactions.
Key words: continuous fiber-reinforced ceramic composites; 3D C/SiC; interfacial zone; crack; deflection
Biography: Li Jianzhang, Candidate for Ph. D., National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical
University, Xi’an 710072, P. R. China, Tel: 0086-29-88486068-814, E-mail: jianzhang_li@163.com