采用快速化学液相气化渗透法制备了C/C复合材料;利用扫描电子显微镜观察了材料的断口形貌特征;研究了不同层次界面状态对C/C复合材料力学行为及断裂模式的影响. 研究表明:束内纤维与基体间结合要适度,既不能过强也不能过弱,保证材料具有高强度同时又具有一定塑韧性;当碳布层间或束间的基体热解碳与纤维柬表面之间残余孔隙量较多或者结合较弱时,则裂纹沿碳布层表面的纤维与基体热解碳之间扩展而分层;热解碳碳层面排列的越紧密,层面间的结合强度越高,则倾向于在基体热解碳内形成齐茬形断面;若碳层面之间存在过多间隙或结合较弱,则倾向于沿碳层面剥离而分层.
C/C composites were fabricated by a rapid chemical liquid-vaporized infiltration (CLVI) processing. The fractured surfaces were observed by scanning electron microscope (SEM). In this paper, three
types of interfaces in the composites, the fiber-matrix interface within a tow, the interface between carbon cloths or bundles, as well as the interface between pyrocarbon laminar, were discussed.
Moreover, their influences on mechanical behavior of the composites were analyzed. In order to obtain high strength and pseudoductility, it is necessary for C/C composites to have proper interface bond
strength between fiber and matrix, smaller residual pores between carbon cloths or bundles, and proper gaps between pyrocarbon laminar within the matrix.
参考文献
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