Development of structural ceramics having large crack-healing ability and fracture toughness

Koji Takahashi; Masahiro Yokouchi; Sang-Kee Lee; Kotoji Ando

doi:10.1117/12.580719

16 February 2004 Development of structural ceramics having large crack-healing ability and fracture toughness

Koji Takahashi, Masahiro Yokouchi, Sang-Kee Lee, Kotoji Ando

Proceedings Volume 5648, Smart Materials III; (2004) https://doi.org/10.1117/12.580719
Event: Smart Materials, Nano-, and Micro-Smart Systems, 2004, Sydney, Australia

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.

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Koji Takahashi, Masahiro Yokouchi, Sang-Kee Lee, and Kotoji Ando "Development of structural ceramics having large crack-healing ability and fracture toughness", Proc. SPIE 5648, Smart Materials III, (16 February 2004); https://doi.org/10.1117/12.580719

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KEYWORDS

Aluminum

Silicon carbide

Ceramics

Oxidation

Temperature metrology

Heat treatments

Solids

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