スピネル前駆体の合成とその性質 : -原料粉末の粒子径と粉砕の効果-(<特集>セラミック材料)

概要

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MgAl_2O_4 spinel precursor was synthesized from heterogeneous alkoxide solution containing MgO powder with average particle size of 0.1μm. The obtained precursor was very stable and identified as a material consisting of MgO, AlOOH and Mg_4Al_2(OH)_<14>・3H_2O. However, calcination of this precursor at 1200℃ did not yield monolithic spinel powder. MgO from the starting material remained in the calcined powder. In order to eliminate the remaining MgO, an attempt was made to mill the precursor under various conditions by the planetary ball-milling equiment. It was recognized that such milling results in the elimination of the MgO and the synthesizing the same constituents of a precursor by using MgO powder with average particle size of 0.01μm. The obtained powder was sintered at a temperature from 1300℃ to 1600℃ for 3h. Sintering temperature of 1500℃ was enough to obtain polycrystalline spinel with more than 99% of theoretical density.
社団法人日本材料学会の論文
1998-06-15