Fabrication of SiC/SiC composites by means of in situ crystallization of SiC fibers

摘要: Abstract A novel challenge, the in situ crystallization of Pre-SiC reinforced-fiber during fabrication SiC/SiC composites, has been made for cost effectiveness by altering conventional coating method. Constituent parts each fabricated material with various manufacturing conditions were assessed microscopic observation. The depending issues a prototype process rather serious that unwanted areas conspicuously observed as several forms, such residual oxide area, unsintered course matrix, porosity along fiber-tows, and huge scale deformation on fiber-tows. Crystallization fiber itself caused volume contraction about 24.5%, which result formation gap between fiber-tow pyrolytic carbon (PyC) interface. Crucial design parameter is determined amount PyC, large will cause irregular stress bundles hot-pressing. successful improvement, based control dominant defects, shows known defects are rarely final product composite material.