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Preparation of Highly Pure Fine Mullite Powder
Author(s) -
Mizuno Mineo,
Saito Hajime
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb06139.x
Subject(s) - mullite , fumed silica , boehmite , materials science , slurry , chemical engineering , aluminium , aqueous solution , mineralogy , metallurgy , composite material , chemistry , ceramic , organic chemistry , engineering
The preparation of high‐purity mullite powders (3Al 2 O 3 · 2SiO 2 ) was examined using aluminum salts or boehmite and fumed silica. The combination of aluminum sulfate and fumed silica was found to have the highest quality for mullite powder. A slurry consisting of an aqueous solution of aluminum sulfate and fumed silica was dried and heated at 1350°C and was attrition‐milled for 2 h. The mullite powder obtained was composed of submicrometer, uniform, and equiaxial particles with narrow size distribution. It was hot‐pressed at 1600°C for 1 h under 10 MPa or was sintered at 1650°C for 3 h. The bulk densities of the products made by both processes were 3.16 and 3.09 g/cm 3 .