Polymer Infiltration and Pyrolysis (PIP) is one of the most attractive fabrication processes for silicon carbide (SiC) composites due to shape flexibility, mass production and relatively low cost; however, the quality of material obtained by this method has been considered insufficient for use in nuclear applications due to the microstructure of the material obtained. For this study SiC fiber-resuborced SiC (SiCf/SiC) composites are prepared by a modified PIP process named Dry Press Infiltration and Pyrolysis (DPIP). This process combines a well-established ceramic greenbody forming technique, dry pressing, with the PIP process. A woven SiC fiber mat is subiltrated with a slurry of preceramic polymer and ß-SiC micro particles, dry pressed and cured to a greenbody state. The material is then subjected to a repeated cycle of pyrolization and resubiltration with a final heat treatment to achieve a dense crystalline matrix material. The microstructure is analyzed and the thermo-mechanical properties are investigated from room to high temperature. The matrix subiltration and densification indicates a capacity to produce dense, stoichiometric crystalline SiC. The material shows good damage tolerance due to crack deviation, fiber pull-out and there is no degradation up to 1500 ⁰C.
- Crystalline materials,
- Mechanical properties,
- Microstructure,
- Polymers,
- Pressing (forming),
- Strength of materials,
- Crystalline matrices,
- Fabrication process,
- Final heat treatments,
- Nuclear application,
- Polymer subiltration and pyrolysis,
- Quality of materials,
- Silicon carbides (SiC),
- Thermomechanical properties
Available at: http://works.bepress.com/greg-hilmas/144/