1 Introduction
2 Materials and Characterization Methods
Architecture | Before CVI | After CVI | |||
---|---|---|---|---|---|
Fiber volume fraction (%) | Theoretical Density (g cm−3) | Measured density (AP) (g cm−3) | Carbon content (XCT) (Vol.%) | Theoretical Density (XCT) (g cm−3) | |
3D stitched cloth fabric: ① | 55 | 0.97 | 1.21 ± 0.05 | 69.7 | 1.23 |
3D orthogonal woven fabric: ② | 65 | 1.15 | 1.35 ± 0.08 | 76.8 | 1.35 |
Needled short-cut felt: ③ | 50 | 0.88 | 1.10 ± 0.04 | 63.0 | 1.11 |
Architecture | C/C-SiC density (g cm−3) | Carbon (Vol.%) | Silicon Carbide (Vol.%) | Silicon (Vol.%) | Porosity (Vol.%) | |||||
---|---|---|---|---|---|---|---|---|---|---|
GA | XCT | GA | XCT | GA | XCT | GA | Closed pores (matrix) (XCT) | Open pores (MIP) | ||
3D stitched cloth fabric: ① | 2.37 ± 0.07 | 37.1 ± 1.17 | 41.0 | 29.6 ± 0.36 | 29.1 | 30.8 ± 1.14 | 29.9 | 2.50 ± 0.32 | 0.01 | 2.0 |
3D orthogonal woven fabric: ② | 2.16 ± 0.06 | 54.1 ± 0.38 | 56.9 | 16.7 ± 0.63 | 19.0 | 25.8 ± 0.78 | 24.1 | 3.40 ± 0.31 | 0.02 | 2.8 |
Needled short-cut felt: ③ | 2.61 ± 0.03 | 21.5 ± 2.41 | 20.3 | 55.9 ± 1.82 | 56.4 | 20.5 ± 0.93 | 23.3 | 2.10 ± 0.17 | 0.21 | 0.8 |