Chapter 39. Effects of the Interfaces Between Flocs in Wet Processed Zirconia-Alumina on the Mechanical Properties of Smtered Composites.
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1992 The American Ceramics Society
Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10
How to Cite
Konsztowicz, K. J. and Langlois, R. (1994) Effects of the Interfaces Between Flocs in Wet Processed Zirconia-Alumina on the Mechanical Properties of Smtered Composites., in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313978.ch39
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375198
Online ISBN: 9780470313978
- nano-sized dispersions;
- structural materials;
Dense aqueous suspensions (51 vol% solids) of zirconia-alumina were prepared, the content of 3Y-TZ varying from 5 to 30 vol %. Samples were slip cast, and then half of them were additionally isostatically pressed. After sintering in air, there was no difference in strength between “cast-only” and “cast-then-isopressed” composites. However, the fracture toughness of cast-only samples increased significantly with Zr02 content, whereas the toughness of samples isopressed after casting remained independent of zirconia content. This suggests that impressing causes the closure of interfaces between grain flocs and thus prevents formation of “weak boundaries” upon sintering. Such weak boundaries facilitate microcrack formation due to residual stresses, and provide the only toughening mechanism in ZTA composites with non-transforming Zr02.