Abstract
The total hemisphere emissivity at 90°C and the normal spectral reflectance at room temperature of C/SiC composites were measured by using steady-state calorimeter method and Fourier infrared spectrometer (FTIR) respectively. The effect of fiber preform weaving mode, thickness of SiC coating and surface morphology on thermal radiation properties of C/SiC were investigated. The results show that thermal radiation properties of 3D C/SiC composites are superior to those of 2D C/SiC composites. Total emissivity of 2D C/SiC is 0.78, and total emissivity of 3D C/SiC is up to 0.82. The thickness of SiC coating has great effect on thermal radiation properties of C/SiC composites. With increase of SiC coating thickness, total emissivity of C/SiC firstly decrease, then increase, the largest emissivity may attain 0.85. Polished surface makes thermal radiation properties of C/SiC composites reduce with the result that total emissivity of 2D C/SiC and 3D C/SiC is 0.74 and 0.75 respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 303-307 |
| Number of pages | 5 |
| Journal | Guti Huojian Jishu/Journal of Solid Rocket Technology |
| Volume | 28 |
| Issue number | 4 |
| State | Published - Dec 2005 |
Keywords
- C/SiC composites
- Coating thickness
- Normal spectral reflectance
- Preform weaving dimension
- Total hemisphere emissivity