A TEM Study of the Metakaolin-to-Mullite Transformation in Kaolinite

Abstract

Two different kaolinites were heated in the range 850–1000°C and subsequently analyzed using TEM to study the metakaolinite-to-mullite reaction sequence. Metakaolinite was found to exist as amorphous relics of the original kaolinites. Small particles of a spinel composition appeared and grew to a maximum size of ∼50Å at temperatures below the 980°C exothermic reaction. Mullite was detected at and above 980°C which accounts for the 980°C exothermic reaction of these kaolinites.

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Correspondence to J. A. Horner.

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Horner, J.A., Martinez, W.A. & Greenhut, V.A. A TEM Study of the Metakaolin-to-Mullite Transformation in Kaolinite. MRS Online Proceedings Library 21, 195–200 (1983). https://doi.org/10.1557/PROC-21-195

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