γ-アルミナとフッ化ナトリウムからの板状β-アルミナ粒の合成

概要

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In attempt to synthesize β-Al_2O_3 platelets using a novel method, powder mixtures consisting of γ-Al_2O_3 and NaF were heated in a platinum crucible. The effect of the mixing ratio of the raw materials, heating temperature and duration of heating at the selected temperature on the formation of the β-Al_2O_3 platelets was investigated. When powder mixtures consisting of γ-Al_2O_3:NaF=1:X(X=1-4; molar ratio) were heated at 900℃ for 3h, β-Al_2O_3 hexagonal platelets formed. The size of the platelets were 3-8μm in diameter and 10-20 in aspect ratio, independent of the amount of NaF in the starting powders. When a powder mixture consisting of γ-Al_2O_3:NaF=1:2 was heated at 700 to 1100℃ for 3h, β-Al_2O_3 platelets systematically formed. The size and morphology of the platelets were the same as above, independent of heating temperature. In addition, when the powder mixture consisting of γ-Al_2O_3:NaF=1:2 was heated at 800℃ for 0h, β-Al_2O_3 platelets with the same size and morphology formed.
社団法人日本セラミックス協会の論文
2002-06-01