Preparation of MgAl2O4 Spinel Powders via Freeze‐Drying of Alkoxide Precursors
- 1 August 1992
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 75 (8) , 2240-2243
- https://doi.org/10.1111/j.1151-2916.1992.tb04490.x
Abstract
High‐sinterability MgAl2O4 powder has been produced from alkoxide precursors via a freeze‐drying method. Clear alumina sol and magnesium methoxide were used as starting materials in the process. The spinel powders were characterized by various techniques, such as thermal analysis, X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy. The tap density and sinterability of the spinel power are affected by the ball‐milling techniques. Highly dense, transparent, polycrystalline MgAl2O4 has been obtained from these powders by sintering and hot isostatic pressing. Bimodal grain‐size microstructure is observed in a HIPed sample.Keywords
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