SiC-Si.sub.3 N.sub.4 Composite system for special heat-resisting ceramic materials and its fabrication method

摘要

A SiC-Si.sub.3 N.sub.4 composite system for special heat- resisting ceramic materials which is fabricated by firing in a nitriding gas atmosphere a green compact prepared from and composed of, as starting materials, silicon powder and an organic silicon polymer containing carbon and silicon atoms as the major skeletal components, whereby said composite system, as a final fired compact has an interwoven texture of SiC and Si.sub.3 N.sub.4 with sufficient micro gaps to absorb thermal stresses, wherein the quantitative ratio by weight of SiC to Si.sub.3 N. sub.4 in said composite system being in the range of 5%-20%:95%-80%.