Influence of the yttria powder morphology on its densification ability

Agnès Dupont (1) , Alain Largeteau (1) , Claude Parent (1) , Bruno Le Garrec (2) , Jean-Marc Heintz (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 CESTA - Centre d'études scientifiques et techniques d'Aquitaine

The present paper shows that we can predict the densification capacity of an yttria powder in relation with its grain shape by using a simple thermodynamic model. All other parameters, such as temperature, time, sintering atmosphere and nature of the powder are fixed. The values of the relative density and grain size of the final ceramic strongly depend on the shape of the grain of the initial powder. A simple model is proposed to understand these differences and to give tools to predict, step by step the densification capacity of a powder. This study could be extended to powders of different nature.

Mots clés: Grain growth; Sintering; Grain size; Rare earth oxides

Domaines: Matériaux

Agnès Dupont, Alain Largeteau, Claude Parent, Bruno Le Garrec, Jean-Marc Heintz. Influence of the yttria powder morphology on its densification ability. Journal of the European Ceramic Society, 2005, 25 (12), pp.2097-2103. ⟨10.1016/j.jeurceramsoc.2005.03.016⟩. ⟨hal-00015501⟩