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中文摘要：
利用显微CT表征了采用化学气相渗透法（CVI）制备的3D C/SiC复合材料的三维结构,评价了显微CT的微结构表征能力。结果表明：显微CT能够有效地分辨C/SiC复合材料的织构形貌、材料内部缺陷（孔隙和SiC基体密度差异）。通过重构孔隙的三维结构,揭示了CVI过程预制体内部存在沉积气体滞留;通过重构孔隙壁的形貌,揭示了CVI SiC基体表面为球状颗粒形貌,并与化学气相沉积（CVD）SiC涂层表面SEM形貌进行对比,阐明了预制体内外在气相沉积过程中存在压差的本质。
英文摘要：
Nondestructive three-dimensional structure of 3D C/SiC composites fabricated by chemical vapor infiltration（CVI） was characterized using X-ray microcomputed tomography（MicroCT）.The current study was undertaken to assess the capabilities and limitations of MicroCT for the characterization of C/SiC composites.Results demonstrate that MicroCT can facilitate characterization of fabric morphology,defects（porosity and the different densities of SiC matrix） in 3D C/SiC composites.A gas retention and viscous flow formation in the preform was revealed in the light of three-dimensional porosity.A nodular surface morphology of SiC matrix fabricated by CVI was observed by reconstructing the matrix porosity-wall.Comparing with the SEM surface morphology of SiC coating fabricated by chemical vapor deposition（CVD）,pressure difference between the inner and outer preform was demonstrated.
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