Zirconia ceramics from coprecipitated powders

Zirconia ceramics from coprecipitated powders The possibility was explored of making dense and strong partly stabilized zirconia (PSZ)-based ceramic materials from coprecipitated zirconium and yttrium hydroxide powders of both factory and laboratory preparation. The effect of dry and wet grinding, powder burning, cold isostatic pressure (CIP) at≤0.8 GPa, and sintering at ≤1600°C on the physicochemical properties of the material was investigated. It was found that the properties (a density of 5.7–5.8 g/cm3, a bending strength of 600 to 800 MPa, and a crack resistance of 7–9 MPa·m1/2) of the resulting ceramic material would not be reproduced unless the tendency of the PSZ powder to agglomerate spontaneously in storage is overcome or avoided. It is shown that in contrast to other similar materials the ceramic material from a deagglomerated powder has a higher optimal CIP pressure (0.6 GPa), which implies that the material has an improved thermal endurance and a better mechanical stability. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

Zirconia ceramics from coprecipitated powders

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Publisher
Springer US
Copyright
Copyright © 1998 by Plenum Publishing Corporation
Subject
Chemistry; Characterization and Evaluation of Materials; Materials Science; Ceramics, Glass, Composites, Natural Methods
ISSN
1083-4877
eISSN
1573-9139
D.O.I.
10.1007/BF02767954
Publisher site
See Article on Publisher Site

Abstract

The possibility was explored of making dense and strong partly stabilized zirconia (PSZ)-based ceramic materials from coprecipitated zirconium and yttrium hydroxide powders of both factory and laboratory preparation. The effect of dry and wet grinding, powder burning, cold isostatic pressure (CIP) at≤0.8 GPa, and sintering at ≤1600°C on the physicochemical properties of the material was investigated. It was found that the properties (a density of 5.7–5.8 g/cm3, a bending strength of 600 to 800 MPa, and a crack resistance of 7–9 MPa·m1/2) of the resulting ceramic material would not be reproduced unless the tendency of the PSZ powder to agglomerate spontaneously in storage is overcome or avoided. It is shown that in contrast to other similar materials the ceramic material from a deagglomerated powder has a higher optimal CIP pressure (0.6 GPa), which implies that the material has an improved thermal endurance and a better mechanical stability.

Journal

Refractories and Industrial CeramicsSpringer Journals

Published: Nov 26, 2007

References

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