噴霧熱分解法によるディオプサイド微粉体の調製とその焼結性

概要

論文の詳細を見る
Fine powders of diopside, CaMgSi_2O_6, were prepared by the spray pyrolysis method. Ca(NO_3)_24H_2O, Mg(NO_3)_26H_2O and Si(OC_2H_5)_4, were dissolved into ethanol and refluxed under various time- temperature conditions before pyrolysis. Refluxing at 70℃ for I day was necessary to prepare homogeneously mixed diopside precursor powders. Spray pyrolysis was made between 800° and 1000℃ under the following conditions : volume of flowing solution, 2 to 15 ml/min, volume of flowing air, 2 to 15 l/min, and concentration of solution, 0.05 to 0.33 mol/l. Almost all powder particles were hollow spheres of a few micron meter, which were composed of fine primary particles of submicron or less. These powders were calcined at 1000℃ and sintered at 1275° to 1350℃ after ground with a vibration mill. Relative densities up to 97.4% were achieved by firing at 1300℃ for 1h without additives. This specimen showed dielectric losses much lower than those sintered with additives reported before.
社団法人日本セラミックス協会の論文
1989-07-01