Chapter 31. Environmental Deterioration and Damage of Ceramic Matrix Composites
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1995 The American Ceramic Society
Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5
How to Cite
Okabe, N., Murakami, I., Hirata, H., Yoshioka, Y. and Ichikawa, H. (1995) Environmental Deterioration and Damage of Ceramic Matrix Composites, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch31
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1995
Print ISBN: 9780470375389
Online ISBN: 9780470314784
- human dimensions;
- metabolic energy;
- cumulative trauma disorders
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.