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Proceedings Paper

Self-crack-healing behavior under cyclic stress of silicon nitride composite at elevated temperature
Author(s): Koji Takahashi; Shoko Yoshida; Kotoji Ando; Shinji Saito
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Paper Abstract

Si3N4/SiC composite ceramics were hot-pressed to investigate the crack-healing behavior under stress. Semi-elliptical surface cracks of 0.1 mm in surface length were made on each specimen. The pre-cracked specimens were crack-healed under cyclic or constant bending stress, and the resultant bending strength and cyclic fatigue strength were studied. The threshold stress for crack-healing was investigated at healing temperatures of 1000° and 1200°C. The cyclic fatigue strengths of crack-healed specimens were also investigated at healing temperatures of 900° and 1000°C. The main conclusions are as follows: (1) The threshold cyclic and constant stresses for crack-healing, below which pre-cracked specimens recovered their bending strength, were 300 MPa which was 75% of the bending strength of the pre-cracked specimens, and (2) The crack-healed specimens exhibited quite high cyclic fatigue strength at crack-healing temperatures of 900° and 1000°C.

Paper Details

Date Published: 16 February 2004
PDF: 8 pages
Proc. SPIE 5648, Smart Materials III, (16 February 2004); doi: 10.1117/12.580717
Show Author Affiliations
Koji Takahashi, Yokohama National Univ. (Japan)
Shoko Yoshida, Yokohama National Univ. (Japan)
Kotoji Ando, Yokohama National Univ. (Japan)
Shinji Saito, NHK Spring Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 5648:
Smart Materials III
Alan R. Wilson, Editor(s)

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