Abstract
SiC/SiC composites with attractive thermo-mechanical properties and gas tightness have been developed through a combination of transient liquid-phase sintering of nano-phase SiC powders mixed with oxide additives and advanced near-stoichiometric SiC fibers with an appropriate coating. The mechanical properties generally improved with the increased sintering temperature and pressure in the range employed in the present experiment. The mechanical property improvement was attributed to the reduced intra-fiber bundle matrix porosity and the promoted matrix sintering. The matrix consisted mostly of even-sized SiC crystal grains both in fiber-bundle and fiber-free regions. Thermal conductivity is likely be determined by the grain boundary scattering. The thermo-mechanical properties of the composites will be tailorable by controlling the matrix microstructure through varying the sintering temperature and time. The tailorability will probably be limited by interfacial structure integrity and the fibers' heat resistance.
| Original language | English |
|---|---|
| Pages (from-to) | 363-370 |
| Number of pages | 8 |
| Journal | Ceramic Engineering and Science Proceedings |
| Volume | 23 |
| Issue number | 3 |
| State | Published - 2002 |
| Externally published | Yes |
| Event | 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A - Cocoa Beach, FL, United States Duration: Jan 13 2002 → Jan 18 2002 |