Microstructural characterization of ZrO{sub 2}/O{prime}-SiAlON composites
- Monash Univ., Melbourne (Australia). Dept. of Materials Engineering
- CSIRO, Melbourne (Australia). Div. of Materials Science and Technology
Zirconia has demonstrated a very moderate toughening effect in nitrogen-based ceramic composites because the reaction between tetragonal zirconia (t-ZrO{sub 2}) and nitrogen results in additional zirconia stabilization to a nontransformable t{prime} or cubic structure. In O{prime}-SiAlON matrices, the oxygen concentration increases and the oxygen-rich intergranular glassy phase prevents zirconia from nitridation. As a result, tetragonal ZrO{sub 2} is maintained and is transformable in the O{prime}-SiAlON materials. The present study has provided transmission electron microscopy (TEM) evidence of the zirconia transformation and the associated toughening effect in a ZrO{sub 2}/O{prime}-SiAlON composite. The implications and limitations of the transformation on toughening of the material are discussed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 253570
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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