The microstructure morphologies have been characterized by high resolution laboratory X-ray computed tomography in Carbon Fiber Reinforced Carbon and Silicon Carbide (C/C-SiC) ceramic composites fabricated by Gaseous Silicon Infiltration (GSI) from C/C preforms of three different architectures: 3D stitched cloth fabric; 3D orthogonal woven fabric; and needled short-cut felt. Each composites’ microstructure was influenced by the structure of the C/C preform. By incorporating tomography with gravimetric analysis, the 3D distribution of the SiC was visualized, showing a connected SiC network in the needled short-cut felt, and more heterogeneous SiC formation on the surfaces of the fiber bundles in the stitched and woven fabrics. The needled short-cut felt provided the largest contact surface for the GSI reaction and generated ~56% volume fraction of SiC, which is almost twice and three times that achieved in the stitched and woven fabrics respectively. Differences in the open and closed pore distributions were also measured by mercury intrusion porosimetry and tomography.

通过高分辨率实验室X射线计算机断层扫描对微观结构形态进行了表征，该技术是由气态硅渗透（GSI）由三种不同结构的C / C预成型坯制成的碳纤维增强碳和碳化硅（C / C-SiC）陶瓷复合材料： 3D缝制布艺面料；3D正交织造布；和针刺的短毛毡。每种复合材料的微观结构均受C / C预成型坯结构的影响。通过将断层扫描与重量分析相结合，可以显示出SiC的3D分布，显示了在针刺式短切毡中连接的SiC网络，并且在缝合和机织织物的纤维束表面上形成了更多种的SiC。针刺式短毛毡为GSI反应提供了最大的接触表面，并产生了约56％的SiC体积分数，几乎分别是缝合和机织织物的两倍和三倍。还通过压汞法和层析X射线摄影术测量了开孔和闭孔分布的差异。