Preparation of MgAl <sub>2</sub> O <sub>4</sub> Spinel Powders via Freeze‐Drying of Alkoxide Precursors
Chuei‐Tang WangMaterials Research and Development Center, Chung Shan Institute of Science and Technology, Lungtan, Taoyuan, Taiwan, Republic of ChinaLin LiMaterials Research and Development Center, Chung Shan Institute of Science and Technology, Lungtan, Taoyuan, Taiwan, Republic of ChinaSheng‐Jenn YangMaterials Research and Development Center, Chung Shan Institute of Science and Technology, Lungtan, Taoyuan, Taiwan, Republic of China
1992en
ABI
Аннотация
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.
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