【作者】 尹立； 赵东林； 沈曾民；

【Author】 YIN Li,ZHAO Dong-lin,SHEN Zeng-min (Key Laboratory of Carbon Fiber and Functional Polymer of Ministry of Education, Beijing University of Chemical Technology,Beijing 100029,China)

【机构】 北京化工大学碳纤维及功能高分子教育部重点实验室；

【摘要】 用反应熔体浸渗法(RMI)制备了三维针刺C/C-SiC复合材料,研究了C/C-SiC复合材料组织结构的演变过程,用SEM、XRD和微区能谱分析研究了C/C-SiC复合材料的物相组成和微区元素组成。中间相沥青基碳主要填充在C/C复合材料纤维束内的孔隙中,基体碳呈片层结构,C/C复合材料在高温熔融渗Si时部分闭气孔打开,从而为RMI渗Si提供通道,材料密度大幅提高,复合材料孔洞内残余硅较多,靠近孔洞的纤维部分受损,C/C复合材料较致密区域的纤维束内有很少的硅渗入,束内纤维受损轻微,仍能保持纤维的增韧作用。更多还原

【Abstract】 Three-dimensional(3D) needled C/C-SiC composites were prepared by reactive melt infiltration (RMI).The structure evolution of 3D needled C/C-SiC composites prepared by RMI has been investigated.The microstructure and composition of C/C and C/C-SiC composites infiltrated by the liquid silicon were investigated by SEM,X-ray diffraction(XRD) and energy dispersive X-ray analysis(EDXA).The results indicated that the mesophase pitch based carbons in the C/C composites were mainly filled in the fiber bundles,and the matrix carbon presented laminated structure.In addition,some closed pores in C/C composites were opened when liquid silicon infiltrated at high temperatures,which acted as the channel for silicon infiltration,and the density of composites was greatly enhanced.The voids near the carbon fibers were partly destroyed due to the silicon remained in the voids of the composites.Some carbon fibers inside the fiber bundles were slightly damaged by liquid silicon,which could reinforce the C/C-SiC composites.更多还原