Chapter 55. Microstructure Control of Alumina Ceramics
- Todd Jessen,
- Ersan Ustundag
Published Online: 28 MAR 2008
DOI: 10.1002/9780470294635.ch55
Copyright © 2000 The American Ceramic Society
Book Title
24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4
Additional Information
How to Cite
Iio, S., Yamamoto, H. and Mitsuoka, T. (2008) Microstructure Control of Alumina Ceramics, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294635.ch55
Publication History
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 2000
Book Series:
ISBN Information
Print ISBN: 9780470375693
Online ISBN: 9780470294635
- Summary
- Chapter
- References
Keywords:
- microstructure control;
- alumina ceramics;
- elevated temperatures;
- high corrosion resistance;
- alumina matrix
Summary
Microstructure control of alumina ceramics by addition of small amounts of sintering additives was studied with emphasis on improvement of mechanical properties. In situ formation of platelet-like grains occurred during sintering by adding oxides in combination such as SiO2-Nb2O5 and TiO2-Co2O2. Flexural strength and fracture toughness were remarkably improved simultaneously by optimizing the microstructure as compared with those of the conventional alumina ceramics having equiaxial grains. The toughening mechanism is thought to be the combined effect of crack deflection and grain bridging, being promoted by the change of the microstructure from equiaxial to platelet-like grains. This also affected the thermal shock resistance, flexural strength at elevated temperatures, and cyclic fatigue behavior.