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Ceramica  2011 

Efeito da temperatura de queima em composi??o de massa para revestimento ceramico vitrificado com argila caulinítica e nefelina sienito

DOI: 10.1590/S0366-69132011000100004

Keywords: kaolinitic clay, flux, nepheline-syenite, ceramic tiles.

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this work had for objective to development vitrified ceramic tiles body using the nepheline-syenite flux with a kaolinitic clay. formulations were prepared with addition of 0, 30 and 50 wt.% of nepheline-syenite to the clay. specimens were prepared by uniaxial pressure at 30 mpa followed by firing at 1100, 1150 and 1200 oc. the evaluated physical and mechanical properties were: dry bulk density, linear shrinkage, three point bending mechanical strength and water absorption. the microstructure of the fired ceramics was evaluated by scanning electron microscopy and x-ray diffraction. the results showed that the incorporation of nepheline-syenite significantly enhanced the properties of the clay making it possible to reach the specification of vitrified ceramic tiles.


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