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Densification mechanism involved during spark plasma sintering of a codoped α-alumina material: Part I. Formal sintering analysis

Published online by Cambridge University Press:  31 January 2011

G. Bernard-Granger  and
C. Guizard
C. Guizard
Affiliation:
Laboratoire de Synthèse et Fonctionnalisation des Céramiques, UMR 3080 CNRS/Saint-Gobain, Saint-Gobain C.R.E.E., 84306 Cavaillon Cedex, France
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Abstract

Spark plasma sintering (SPS) of a codoped α-alumina powder has been investigated at temperatures between 850 and 1200 °C. The “grain size versus relative density” trajectory showed a significant grain growth as soon as the residual porosity closed. The densification mechanism was determined by anisothermal (investigation of the heating part of a SPS run) and isothermal methods. It was proposed that grain-boundary sliding, accommodated by oxygen grain-boundary diffusion, governed densification.

Keywords

CeramicDensificationSintering
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 1 , January 2009 , pp. 179 - 186
Copyright
Copyright © Materials Research Society 2009

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