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Ultra-fine mullite precursor powders were prepared from the uniform mixtures of ultra-fine γ-Al 2 O 3 and alkoxide-derived SiO 2 powders. Two kinds of mixing methods--ball milling and stirring--were used to change the level of mixing. The ball milling method attained the more uniform mixing state to form single phase mullite after the calcination of mixed powder at 1300°C...
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