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Temperature dependence of constitutive behaviour for solid-state sintering of alumina

Zuo, Ruzhong and Rödel, Jürgen (2004):
Temperature dependence of constitutive behaviour for solid-state sintering of alumina.
In: Acta Materialia, pp. 3059-3067, 52, (10), ISSN 13596454, [Online-Edition: http://dx.doi.org/10.1016/j.actamat.2004.03.008],
[Article]

Abstract

A discontinuous hot forging approach was employed in this study in order to extract the temperature dependence of the constitutive sintering parameters for alumina. Uniaxial viscosity and sintering stress were both experimentally obtained as functions of density and temperature for an isotropic microstructure. The activation energy for the viscosities was determined to be approximately 480 kJ/mol by means of an Arrhenius-type plot incorporating the grain size data at varying temperatures. It was indicated that creep and densification during sintering of alumina under a small uniaxial load were both grain boundary diffusion controlled kinetic processes. The same temperature dependence of uniaxial and bulk viscosities was demonstrated, indicating that the viscous Poisson's coefficient is temperature-independent. The sintering stress of a porous compact was experimentally identified as independent of temperature, but inversely proportional to grain size, in agreement with theoretical predictions.

Item Type: Article
Erschienen: 2004
Creators: Zuo, Ruzhong and Rödel, Jürgen
Title: Temperature dependence of constitutive behaviour for solid-state sintering of alumina
Language: English
Abstract:

A discontinuous hot forging approach was employed in this study in order to extract the temperature dependence of the constitutive sintering parameters for alumina. Uniaxial viscosity and sintering stress were both experimentally obtained as functions of density and temperature for an isotropic microstructure. The activation energy for the viscosities was determined to be approximately 480 kJ/mol by means of an Arrhenius-type plot incorporating the grain size data at varying temperatures. It was indicated that creep and densification during sintering of alumina under a small uniaxial load were both grain boundary diffusion controlled kinetic processes. The same temperature dependence of uniaxial and bulk viscosities was demonstrated, indicating that the viscous Poisson's coefficient is temperature-independent. The sintering stress of a porous compact was experimentally identified as independent of temperature, but inversely proportional to grain size, in agreement with theoretical predictions.

Journal or Publication Title: Acta Materialia
Volume: 52
Number: 10
Uncontrolled Keywords: Sintering; Forging; Ceramics; Diffusion; Microstructure; Isotropy
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Jun 2011 12:11
Official URL: http://dx.doi.org/10.1016/j.actamat.2004.03.008
Identification Number: doi:10.1016/j.actamat.2004.03.008
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