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

Autor: Vincent Garnier, Paola Palmero, Mirella Azar, Laura Montanaro, Mariangela Lombardi, Gilbert Fantozzi, Jérôme Chevalier
Přispěvatelé: Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Mateis, Laboratoire
Jazyk: francouzština
Rok vydání: 2009
Předmět:
Zdroj: International Journal of Applied Ceramic Technology
International Journal of Applied Ceramic Technology, Wiley, 2009, pp.420-430
ISSN: 1546-542X
1744-7402
Popis: International audience; 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.
Databáze: OpenAIRE
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