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Proceedings Paper

Development of structural ceramics having large crack-healing ability and fracture toughness
Author(s): Koji Takahashi; Masahiro Yokouchi; Sang-Kee Lee; Kotoji Ando
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Paper Abstract

Al2O3 reinforced by SiC whiskers (Al2O3/SiC-W) was hot pressed to investigate the crack-healing behavior. Semi-elliptical surface cracks of 50 to 450μm in surface length were introduced using a Vickers indenter. The specimens containing pre-cracks were crack-healed at temperatures between 1000°C and 1300°C for 1h in air, and their strengths were measured by three-point bending tests at room temperature and elevated temperatures between 400°C and 1300°C. The results show that Al2O3/SiC-W possesses considerable crack-healing ability. The surface cracks with length of 2c=100μm could be healed by crack-healing at 1200°C or 1300°C for 1h in air. The maximum crack size that can be healed for Al2O3/SiC-W is 2c=200μm. Fracture toughness of the material was also determined. As expected, the SiC whiskers made their Al2O3 tougher.

Paper Details

Date Published: 16 February 2004
PDF: 8 pages
Proc. SPIE 5648, Smart Materials III, (16 February 2004); doi: 10.1117/12.580719
Show Author Affiliations
Koji Takahashi, Yokohama National Univ. (Japan)
Masahiro Yokouchi, Kanagawa Industrial Technology Research Institute (Japan)
Sang-Kee Lee, Yokohama National Univ. (Japan)
Kotoji Ando, Yokohama National Univ. (Japan)


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

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