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Abstract

Celsian and fluorophlogopite phases have been developed in porcelain using Egyptian talc. Well developed fluorophlogopite with randomly oriented crystals within the glassy phase acts as a reinforcing aid. Hexacelsian crystallises at or below 900°C and then transforms into monoclinic celsian by epitaxial growth. Formation of fluorophlogopite enhances the transformation of hexacelsian to monocelsian. The best conditions for simultaneous crystallisation of a fluorophlogopite and celsian phase mixture are a heating rate of 5 K min⁻¹ and cooling rate of 10 K min⁻¹ between 700 and 930°C. A marked shift in the positions of XRD peaks for celsian occurs as a result of the substitutional solid solution between Ba²⁺ and K⁺. Crystallisation of forsterite disappears in the mix with highest silica content. Microhardness decreases at temperatures above 950°C because of transformation of hexacelsian into celsian and the decrease in fluorophlogopite content.

Keywords

CELSIAN FLUOROPHLOGOPITE MACHINABILITY SOLID SOLUTION

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Celsian–fluorophlogopite porcelain based on Egyptian talc

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