Effect of heating rate on phase and microstructural evolution during pressureless sintering of a nanostructured transition alumina - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Applied Ceramic Technology Année : 2009

Effect of heating rate on phase and microstructural evolution during pressureless sintering of a nanostructured transition alumina

Résumé

Deagglomeration of a nanocrystalline transition alumina performed using different techniques was first demonstrated to be active in the achievement of a better powder compaction ability under uniaxial pressing and consequently in the development of a highly dense and homogeneous microstructure during pressureless sintering. A major effect, however, was associated to the heating rate chosen during the densification cycle. In fact, the influence of different heating rates (10°C/min or 1°C/min) on phase and microstructural evolution during sintering was investigated in depth on the above best green bodies. A low-rate thermal cycle leads to a significant reduction of the α-Al2 O3 crystallization temperature and promotes a more effective particle rearrangement during phase transformation. As a consequence, in the low-rate treated material, it was possible to avoid the development of a vermicular structure as usually expected during the densification of a transition alumina and to yield a more homogenously fired microstructure.

Domaines

Matériaux
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Dates et versions

hal-00431371 , version 1 (12-11-2009)

Identifiants

  • HAL Id : hal-00431371 , version 1

Citer

Paola Palmero, Mariangela Lombardi, Laura Montanaro, Mirella Azar, Jérome Chevalier, et al.. Effect of heating rate on phase and microstructural evolution during pressureless sintering of a nanostructured transition alumina. International Journal of Applied Ceramic Technology, 2009, pp.420-430. ⟨hal-00431371⟩
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