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Crack‐healing behaviour of ZrO2/SiC composite ceramics

Keiji Houjou (Department of Mechanical Engineering, Oyama National College of Technology, Oyama, Japan)
Kotoji Ando (Department of Energy and Safety Engineering, Yokohama National University, Yokohama, Japan)
Koji Takahashi (Department of Energy and Safety Engineering, Yokohama National University, Yokohama, Japan)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 5 March 2010

681

Abstract

Purpose

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Zirconia ceramics exhibit high strength and fracture toughness. The purpose of this paper is to research a possibility of crack healing in zirconia ceramics.

Design/methodology/approach

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ZrO2/SiC composite ceramics are sintered and subjected to three‐point bending. A surface crack of 100 μm in diameter is formed on each specimen. The cracks are healed and the specimens are tested under bending.

Findings

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The paper finds that ZrO2/SiC composite ceramic material had a high crack‐healing ability at a considerably low temperature. For example, a crack of 100 μm in diameter is healed even at 600°C.

Research limitations/implications

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The paper provides a low temperature healing and a new mechanism of crack healing.

Originality/value

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The paper shows the healing temperature and the minimum time required to heal showed a good proportional relation on the Arrhenius plot at temperatures of 600‐800°C. Moreover, the crack healing is caused by SiO2 cristobalite produced during the healing.

Keywords

Citation

Houjou, K., Ando, K. and Takahashi, K. (2010), "Crack‐healing behaviour of ZrO2/SiC composite ceramics", International Journal of Structural Integrity, Vol. 1 No. 1, pp. 73-84. https://doi.org/10.1108/17579861011023810

Publisher

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Emerald Group Publishing Limited

Copyright © 2010, Emerald Group Publishing Limited

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