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Preparation of MgAl 2 O 4 Spinel Powders via Freeze‐Drying of Alkoxide Precursors
Author(s) -
Wang ChueiTang,
Lin LangSheng,
Yang ShengJenn
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04490.x
Subject(s) - spinel , materials science , crystallite , alkoxide , microstructure , sintering , scanning electron microscope , transmission electron microscopy , ball mill , mineralogy , chemical engineering , grain size , metallurgy , composite material , chemistry , nanotechnology , catalysis , biochemistry , engineering
High‐sinterability MgAl 2 O 4 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 MgAl 2 O 4 has been obtained from these powders by sintering and hot isostatic pressing. Bimodal grain‐size microstructure is observed in a HIPed sample.