For studying the environmental deterioration and damage three kinds of tests of the foreign object impact tests, the atmosphere controlled bending tests and the oxidation tests were carried out for SiC/SiC composites. Impact damage of the single-particle impact test was limited to the impact region of a specimen and was outstandingly different from that of monolithic ceramics occurring catastrophic fracture. The critical velocity was expressed as exponential form of particle size d to the minus three half power and SiC/SiC composites showed high impact damage resistance compared with monolithic ceramics. The morphology of the high temperature bending fracture depended on the test atmosphere. Zigzag crack propagation and pullout of fibers were observed in inert gas, but the crack propagated straight without pullout of fibers in air and in simulated combustion gas. Not only the surface but also the fibers and the matrix ceramics in the specimen were oxidized because of being porous in matrix. As for the fibers the protective SiO2 oxide layer were produced on the surfaces and the pyrolysis of fibers was suppressed by it.
|ジャーナル||Ceramic Engineering and Science Proceedings|
|出版ステータス||Published - 1995 9 1|
|イベント||Proceedings of the 19th Annual Conference and Exhibition on Composites, Advanced Ceramics, Materials, and Structures-B. Part B - Cocoa Beach, FL, USA|
継続期間: 1995 1 8 → 1995 1 12
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry