ガラス融液からのファイバー状ムライトの生成条件

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タイトル別名
  • Crystallization of Fibrous Mullite from Glass Melt
  • ガラス ユウエキ カラ ノ ファイバージョウ ムライト ノ セイセイ ジョウケ

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Mullite is one of the most outstanding ceramic materials used at a high temperature in these days. We have made a fundamental research to produce ceramics/ceramics composites by dispersing mullite fibers into the silicate glass matrix using a solidification processing. The influence of parents materials, namely SiO2/mullite systems or SiO2/Al2O3 systems, and melting conditions on the morphology of crystallized mullite were mainly examined.<BR>(1) In both systems the mullite nucleated as primary phase during isothermal treatment in the solid/liquid co-existence range grew into fibrous single crystals by cooling. The shape of the mullite changed from fibrous to granular with increasing Al2O3 content in the melt.<BR>(2) Mullite nucleated and grew during isothermal treatment at 1973 or 1923 K when the melt contained more than 14.7 mass%Al2O3 in the SiO2/Al2O3 systems and more than 10.7 mass%Al2O3 (15 mass% mullite) in the SiO2/mullite systems.<BR>(3) As the mullite grew, the SiO2 content in the melt increases. This induced the increase in viscosity of the melt and then the decrease in diffusion coefficient. As the result, the residual melt solidified to glass.<BR>(4) Dendritic mullite fibers could be formed only in the case of 14.7 mass%Al2O3 melt for both systems.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 57 (2), 195-202, 1993

    公益社団法人 日本金属学会

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