1982•eScholarship (California Digital Library)Open access
FORMATION OF MULLITE IN KAOLINITE AND Al2O3-SiO2 MIXTURES
S. M. Johnson, Joseph A. Pask
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Abstract
Effect of addition of impurities present in kaolinite -Ti0 2 , Fe 2 o 3 , Na 2 o, ~0 -to equivalent Al 2 0 3 -Si0 2 mixtures on crystal size and morphology of mullite were studied at 1650-1700°C.CaO and larger amounts of Fe 2 o 3 added to A1 2 0 3 -Si0 2 mixtures and to kaolinite caused an increase in crystal size.Kaolinite-based mixtures always showed acicular crystals which were observed in an Al 2 0 3 -Si0 2 mixture only with larger additions of Fe 2 o 3 •
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