1. Typical morphologies of porous carbon for preparation of (a-d) SiC^{[24⇓⇓-27]}, (e) SiC/SiC^[33], (f, g) C/SiC^[31,39] and (h) C/SiC-ZrC^[18]

2. Schematic illustration of preparation for porous carbon by phase separation^[49]

3. (a) Schematic illustration of ceramic layer generated during the RMI and (b) curves of preforms pore radius vs infiltration time^[33]

4. Schematic illustration of formation of porous resin obtained by Sol-Gel^[34]

5. XRD patterns of different C/SiC composites^[39]

6. (a) Schematic illustration of liquid Si infiltration in double-walled carbon nanotubes, (b) relationship between infiltration height (H) and infiltration time (t) for liquid Si infiltration, and (c) capillary infiltration behavior of liquid Si into a double-walled carbon nanotubes with an inner tube diameter of 2 nm^[51]

7. Microstructures of (a) interface and (b) matrix in the C/ZrC-C preform^[54]

8. (a, b) Microstructures and (c) pore size distribution curves of the porous C/C, and (d) cross-sectional micrograph of the C/C-SiC-(Zr_xHf_1-x)C^[35]

9. Cross-sectional morphologies of (a) C/SiC-HfC and (b, c) SiC-HfC matrix, and (d) grain diameter distribution of HfC and its mean diameter^[18]

10. Comparison of (a) flexural strength and (b) 2200 ℃ linear ablation rates of ceramic matrix composites obtained by conventional RMI and improved RMI through ceramization of porous carbon matrix^{[18,33⇓-35,39]}