Sintering of powders in the Al2O3-ZrO2-Y2O3 system obtained by the method of rapid solidification of the melt as a function of the initial heat treatment

Sintering of powders in the Al2O3-ZrO2-Y2O3 system obtained by the method of rapid solidification... The effect of heat treatment at 1340 — 1450°C on the sintering of ceramic powders of the A12O3-ZrO2-Y2O3 system obtained by the method of rapid solidification of the melt is considered. It is shown that in this temperature range powder particles undergo crystallization of the amorphous phase and an ε-A12O3 → α-A12O3 transformation with the formation of an intraparticle ultradisperse polycrystalline structure of an eutectic type. The system attains a thermodynamically equilibrium state. However, the sinterability of compacts from such powders increases substantially, which is associated with the elevated contribution of the intraparticle grain boundary diffusion into the diffusion mass transfer. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

Sintering of powders in the Al2O3-ZrO2-Y2O3 system obtained by the method of rapid solidification of the melt as a function of the initial heat treatment

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Publisher
Springer Journals
Copyright
Copyright © 1999 by Kluwer Academic/Plenum Publishers
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/BF02765072
Publisher site
See Article on Publisher Site

Abstract

The effect of heat treatment at 1340 — 1450°C on the sintering of ceramic powders of the A12O3-ZrO2-Y2O3 system obtained by the method of rapid solidification of the melt is considered. It is shown that in this temperature range powder particles undergo crystallization of the amorphous phase and an ε-A12O3 → α-A12O3 transformation with the formation of an intraparticle ultradisperse polycrystalline structure of an eutectic type. The system attains a thermodynamically equilibrium state. However, the sinterability of compacts from such powders increases substantially, which is associated with the elevated contribution of the intraparticle grain boundary diffusion into the diffusion mass transfer.

Journal

Refractories and Industrial CeramicsSpringer Journals

Published: Nov 23, 2007

References

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