Sintering of an ultra pure α-alumina powder: I. Densification,grain growth and sintering path |
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Authors: | Guillaume Bernard-Granger Christian Guizard Ahmed Addad |
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Affiliation: | (1) Laboratoire de Synthèse et Fonctionnalisation des Céramiques, FRE 2770 CNRS/Saint-Gobain, Saint-Gobain C.R.E.E., 84306 Cavaillon Cedex, France;(2) Laboratoire de Structure et Propriétés de l’Etat Solide, UMR 8008 CNRS, Université des Sciences et Technologies de Lille, Batiment C6, 59655 Villeneuve d’Ascq Cedex, France |
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Abstract: | Sintering in air of an ultra pure α-alumina powder has been investigated. Isothermal experiments have been conducted on green
samples shaped by slip casting. The grain growth and densification kinetics have been established. The “relative density/grain
size” trajectory, called “sintering path”, has been drawn. Hypotheses concerning the mechanisms controlling grain growth and
densification have been formulated. For the first time, it is shown that grain growth and densification kinetics exhibit two
distinct regimes, where an initial point defect formation step plays a key role. When point defects have been generated, the
diffusion of the associated Al3+ cations controls grain growth and densification. |
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