Zirconia-dispersed mullite composites were prepared by reaction sintering of boehmite, -alumina, (+)-alumina and -alumina as sources, mixed with zircon powder. The powder mixtures were ball-milled and isostatically pressed into disks. The obtained samples were sintered between 1400 and 1600°C for 2h in air. The resulting sintered materials were characterized in terms of bulk density, dilatometry, DTA/TG, XRD and SEM. From the dilatometric and differential thermal analysis curves, several microstructural transformations which occur in these samples are detailed in this work. XRD peaks suggested fully developed mullite and zirconia phases by reaction sintering of zircon and all alumina phases. Zircon usually dissociates at temperature higher than 1665°C. However, it is shown in this study that zircon dissociates at about 1400°C due to the presence of transition alumina phases. The microstructure of all the composites is composed of irregularly shaped mullite grains, and round-shaped zirconia grains which are distributed intragranularly and intergranularly.
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Posté Le : 12/07/2021
Posté par : einstein
Ecrit par : - Belhouchet Hocine - Garnier Vincent
Source : Verres Céramiques Composites Volume 1, Numéro 2, Pages 16-24