Production of opaque frits with low ZrO2 and ZnO contents and their industrial uses for fast single-fired wall tile glazes

Autores: Pekkan, K.|Karasu, B.
Fuente: J. Mater. Sci.
44 (10), 2533-2540

The amounts of zirconium and zinc oxides, which raise the production costs of ceramic glazes, were decreased in fast single-fired wall tile frit compositions and an industrial frit production was conducted. Opacity of the fired frit-based glazes was accomplished by compositional modifications of frits with no other nucleating agent. It was determined that the ratios of Al2O3/I R2O pound, Al2O3/I RO pound, and Al2O3/B2O3 have significant effects on decreasing ZrO2 and ZnO levels in the frit composition. A reduction of 25 per cent in both zirconia and zinc oxide contents of frit batches, with respect to the reference frit (R) containing 6-10 per cent ZrO2 and 6-10 per cent ZnO for a glossy white opaque wall tile glaze, was achieved in the ZD glaze consisting of 4.5-7.5 per cent zirconia and 4.5-7.5 per cent ZnO in its frit composition. It was concluded that zircon was the main crystalline phase of the glaze contributing the opacity. The ZD frit-based glaze has a thermal expansion coefficient value of 61.13 /- A 0.32 x 10(-7) A º C-1 at 400 A degrees C which well matches to that of the wall tile body. TS EN ISO 10545 standard tests were also applied to the final ZD glaze. It is confirmed that the production cost of a fast single-fired wall tile glaze can be decreased by 15-20 per cent with the successful new frit developed.

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