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Crack-Healing under Cyclic Stress and Improvement of the Resultant Fatigue Strength of Si3N4/SiC

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Abstract:

Si3N4/SiC composite ceramics were hot-pressed in order to investigate their crack-healing behavior under cyclic stress and the resultant static fatigue strength. Semi-elliptical surface cracks of 100 μm in surface length were made on each specimen. The pre-cracked specimens were crack-healed under a cyclic bending stress of 210MPa in air at 900, 1000, 1100, and 1200 °C. The bending strength and static fatigue strength of the crack-healed specimens were systematically investigated at each healing temperature. The specimens which has been crack-healed and static fatigue-tested at 900 and 1000 °C showed lower static fatigue strength than those tested at 1100 and 1200 °C. Detailed investigation on the fracture surface of static fatigue-tested specimens showed that oxidation of the base material had strong effects on the static fatigue strength. It was found that when the specimens were pre-oxidized in air at 1300 °C, the surface was covered by a protective oxide layer, leading to a significant improvement of static fatigue strength at 900 and 1000 °C.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

453-456

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.453

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Online since:

August 2006

Authors:

Koji Takahashi, Kotoji Ando, Shinji Saito

Keywords:

Crack Healing, Fatigue, Mechanical Property, Oxidation, Si3N4/SiC

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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