Preparation of MgAl2O4 Spinel Powders via Freeze-Drying of Alkoxide Precursors |
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Authors: | Chuei-Tang Wang Lang-Sheng Lin Sheng-Jenn Yang |
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Affiliation: | Materials Research and Development Center, Chung Shan Institute of Science and Technology, Lungtan, Taoyuan, Taiwan, Republic of China |
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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. |
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Keywords: | powders sol-gels freeze drying spinels alkoxide |
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