RAPID FABRICATION OF CARBON FIBERS REINFORCED SILICON CARBIDE COMPOSITES

摘要

Carbon fibers reinforced silicon carbide composites have been designed and developed for high-temperature structural applications, such as engines and reentry thermal protection for spacecraft, due to the combination of both high-strength carbon fibers and high-modulus, oxidation resistance silicon carbide matrix. The common fabrication processes for 3D C/SiC composites are isothermal/isobaric chemical vapor infiltration (ICVI) and polymer precursor conversion (PPC), whereas the both processes have long produce cycles (beyond three months). Moreover, the composites fabricated by the later have poor mechanical and oxidation resistance properties. Here, a newly combined process is introduced to fabricate 3D C/SiC composites, with short produce cycle and improved composite properties. The influences of the process parameters of both ICVI and PPC process on the combined process and composite properties were also investigated. The composites were characterized by microstructure analysis and mechanical test.