固相反応法によるフッ素白雲母の合成と耐熱性

概要

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Fluorine muscovite KAl_2 (AISi_3O_10) F_2 was synthesized through solid state reaction at 600℃ for about 100h from stoichiolnetrical batches. Fluorine muscovite was not formed by heating these raw batches at higher temperatures above 700℃. It was indispensable for mica formation to use γ-Al_2O_3 as raw materials. Appropriate forming pressure for green bodies was found to be 37.5-75 MPa for obtaining crystal aggregates of fluorine muscovite with well-developed interlocking house-of-cards microstructure, which gave machinability to the sintered bodies. Thermal durability of fluorine muscovite crystals in air was relatively high due to the formation of a protective vitrified phase on the surface upon decomposition. Changes in lattice constants and IR spectra suggests the formation of fluorine muscovites having variable layer charges between 1.0-0.9.
社団法人日本セラミックス協会の論文
1996-05-01