Abstract
This study aims to investigate zircon (ZrSiO4) formation during thermal treatment and its influence on the structure and properties of the ceramic glazes. Four raw ceramic glazes with the addition of 5, 9, 13, and 17wt% of ZrO2 (<5μm) at the expense of SiO2 were prepared by the ceramic traditional route. To obtain homogeneous melting and consequently a high-quality surface, 5wt% of colemanite (2CaO·3B2O3·5H2O) was added to the ceramic glazes formulation. XRD, NMR, Raman spectroscopy and FTIR measurements revealed the formation of ZrSiO4. An increase of ZrSiO4 from 35 to 86wt% with an increase of ZrO2 content in the composition of ceramic glazes was observed. 29Si solid-state MAS NMR measurements also showed that with successive increases of ZrO2 concentration the relative intensity of zircon resonance increases. The evaluation of the chemical resistance revealed the beneficial effect of ZrSiO4 on this property.
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