Two-stage master sintering curve applied to two-step sintering of oxide ceramics

Tetragonal (3mol% Y2O3) and two cubic zirconia (8mol% Y2O3) as well as alumina green bodies were used for the construction of the Master Sintering Curve (MSC) created from sets of constant-rate-of-heating (CRH) sintering experiments. The activation energies calculated according to the MSC theory wer...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2013-10, Vol.33 (12), p.2275-2283
Main Authors: Pouchly, Vaclav, Maca, Karel, Shen, Zhijian
Format: Article
Language:English
Subjects:
Activation energy
Alumina
Aluminum oxide
Ceramics
Construction
Deflection
Master sintering curve
Mathematical models
Sintering
Sintering (powder metallurgy)
Yttrium oxide
Zirconia
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Summary:Tetragonal (3mol% Y2O3) and two cubic zirconia (8mol% Y2O3) as well as alumina green bodies were used for the construction of the Master Sintering Curve (MSC) created from sets of constant-rate-of-heating (CRH) sintering experiments. The activation energies calculated according to the MSC theory were 770kJ/mol for Al2O3, 1270kJ/mol for t-ZrO2, 620kJ/mol and 750kJ/mol for c-ZrO2. These values were verified by an alternative approach based on an analysis of the densification rate in the intermediate sintering stage. The MSCs established from the Two-Step Sintering (TSS) experiments showed at high densities a significant deflection from those constructed from the CRH experiments. This deflection was explained by lower sintering activation energy in the closed porosity stage. A new two-stage MSC model was developed to reflect the change in sintering activation energy and to describe TSS. The efficiency of TSS of four materials under investigation was correlated with their activation energies during the final sintering stage.
ISSN:0955-2219
1873-619X
1873-619X
DOI:10.1016/j.jeurceramsoc.2013.01.020