Si3N4/SiC composite ceramics were hot-pressed in order to investigate the crack-healing behavior under stress. Semi-elliptical surface cracks of 100 μm in surface length were introduced on each specimen. The pre-cracked specimens were crack-healed under cyclic or constant bending stress of 5 Hz at healing temperatures of 1000° and 1200°C and the resultant bending strength and fatigue strength were studied. The threshold stress for crack-healing, below which the pre-cracked specimens recovered their bending strength, was investigated. The mechanisms of crack-healing in Si3N4/SiC under stress were also discussed.
- Pressure Vessels and Piping Division
Threshold Stress for Crack-Healing of Silicon Nitride Ceramics
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Takahashi, K, Ando, K, Yoshida, S, & Saito, S. "Threshold Stress for Crack-Healing of Silicon Nitride Ceramics." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Elevated Temperature Design and Analysis, Nonlinear Analysis, and Plastic Components. San Diego, California, USA. July 25–29, 2004. pp. 195-200. ASME. https://doi.org/10.1115/PVP2004-2992
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