纤维增韧碳化硅陶瓷基复合材料的界面区研究  

Interfacial Zone in Continuous Fiber-Reinforced Ceramic Composites

作　　者：李建章[1] 张立同[1] 成来飞[1] 徐永东[1] 李斗星[2] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点实验室,陕西西安710072 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2007年第9期1539-1544,共6页Rare Metal Materials and Engineering

摘　　要：在连续纤维增强陶瓷基复合材料中,界面调节脆性基体与脆性纤维之间匹配关系的功能以及自身特有的物理化学性质,决定着复合材料的整体综合效能。本研究从实践中发现界面区的存在,并尝试提出界面区的概念。界面区是具有一定厚度,含有两处界面(界面相/基体和界面相/纤维)和体相(界面相)的区域。采用透射电子显微技术从微结构的角度研究了3DC/SiC内界面区与裂纹的相互作用行为。TEM观察表明,由于裂纹偏斜/贯穿竞争随时空的推演,基体主裂纹会在界面区的多处位置产生单多重偏斜、裂纹尖端前方应力集中诱发脱粘和开裂、纳米尺度微裂纹桥连等相互作用,其发生的具体部位和方式由界面区内各种相关界面(或断裂)韧性共同决定。此外,结合影响因素的讨论,初步建立起3DC/SiC内基体裂纹与界面区相互作用的物理模型。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 in the 3D C/SiC continuous fiber-reinforced ceramic composites （CFCC） that three kinds of interactions, i.e., the single and m found ultiple 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.

关 键 词：连续纤维增强陶瓷基复合材料 3D C/SIC 界面区 裂纹 偏斜 

分 类 号：TB333[一般工业技术—材料科学与工程]