Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 21, Pages 32152-32155Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.07.156
Keywords
Aluminum oxynitride; Subcritical crack growth; Stress corrosion; Constant stress rate test
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Funding
- Subvention of the Polish State Ministry of Education and Science for AGH University of Science and Technology, Faculty of Materials Science and Ceramics
- [16.16.160.557]
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Subcritical crack growth is often observed in oxide ceramics, but not in non-oxide ceramics. This study demonstrates slow crack propagation in an aluminum oxynitride material and evaluates its effects on material strength.
Subcritical crack growth is often observed in oxide ceramics. This effect is ascribed to the interaction between the strained chemical bonds at the crack tip and water molecules present in the working environment of the material. Owing to this reaction, combined with stresses at the crack tip, slow cracking of the material and relevant strength reduction may occur. In non-oxide ceramics (i.e., without significant oxide sintering additives), no subcritical crack growth was observed. The present work demonstrates slow crack propagation in an aluminum oxynitride (AlON) material. AlON samples were prepared via sintering in nitrogen at 1800 degrees C. This resulted in dense translucent samples. Constant stress rate tests were carried out in both air and water to assess the influence of water on material strength. The strength results were used to further evaluate the effects of subcritical cracking. A clear decrease in strength was observed at low stress rates. Measurement points below 10 MPa/s were used to determine the lowest stress rate for inert strength. The slope of the fitting line indicated the value of subcritical cracking parameter n.
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