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Abstract

The paper examines the influence of Al₂O₃/SiO₂ ratio, bulk chemical composition and temperature in mullite nucleation and growth from kaolinitic clays. Samples from NTAMUKA (TAN), Mayouom (MAY) and Wabane (WAB), region of high hills of West-Cameroon, undergo series of phase changes during sintering between 1000 and 1500°C. Phases transformation included: amorphous SiO₂ and Al₂O₃ as result of breakdown of kaolin above 700°C, nuclei of mullite that growth with temperature development to fine and then large grains at high temperature. The microstructure of the sintered products consisted on the elongated secondary mullite (types II and III) interlocking with primary (type I) mullite in a compact matrix with relative amount of liquid film for MAY and WAB. The morphology of mullite grains in TAN was more different being larger cuboid grains aggregated to form together with cristobalite a compact microstructure. The formation of TiO₂ crystals and then Ti–Al (tialite: Al₂TiO₅) crystals influenced the microstructure of MAY and WAB. The microstructure at high temperature of the three kaolinitic clays indicated their suitability for dense refractory and fine ceramic applications.

Keywords

CLAY MICROSTRUCTURE MULLITE SINTERING CERAMIC

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Microstuctural evolution during thermal treatment of three kaolinitic clays from Cameroon

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