Abstract
Alumina-yttrium aluminum garnet (YAG) 50 vol % nanocomposite powders were prepared by a wet-chemical synthesis and characterized by simultaneous DTA-TG, XRD, and TEM analyses. Amorphous powders were preheated at four different temperatures (namely, 600, 800, 900, and 1215°C) on the basis of the previous characterization, and the influence of this thermal treatment on sintering behavior, final microstructure, and density was investigated. The best-performing sample was that precalcined at 900°C; however, dense bodies were just yielded by sintering at 1600°C, resulting in a micronic/slightly submicronic microstructure. A preseeding step by a fast thermal treatment of the amorphous powder as well as a fast sintering procedure of green compacts, following some literature indications, were also performed as a comparison. Finally, the previously stated thermal pretreatment of the amorphous product was coupled to its extensive mechanical activation performed by wet planetary/ball milling. This procedure was strongly effective in lowering the densification temperature, so that fully dense alumina/YAG composites, with a mean grain size smaller than 200 nm, were obtained by sintering in the temperature range 1370–1420°C.
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Original English Text Copyright © 2005 by Fizika i Khimiya Stekla, Palmero, Stella, Simone, Esnouf, Fantozzi, Montanaro.
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Palmero, P., Stella, C., Simone, A. et al. Different Sintering Routes for Preparing Alumina-Yttrium Aluminum Garnet Nanocomposites. Glass Phys Chem 31, 530–534 (2005). https://doi.org/10.1007/s10720-005-0094-9
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DOI: https://doi.org/10.1007/s10720-005-0094-9