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versão impressa ISSN 0123-921X


DELVASTO ARJONA, Silvio et al. Feasibility of using glass powder as flux in porcelain stoneware tile manufacturing. Tecnura [online]. 2015, vol.19, n.44, pp.59-70. ISSN 0123-921X.

This article presents the results of a research on the use of glass powder as substitute of feldspar for manufacturing stoneware tiles. Mixtures were prepared in which glass powder substituted feldspar in two different percentages (25 wt% and 50 wt%). Specimens of the obtained mixtures were molded, dried and sintered. Physical (apparent density, porousness, absorption, among others) and mechanical properties (flexion resistance) of standard sintered bodies (V0) were compared to the sintered bodies in which the melting material was substituted in the formulation by glass powder in percentages of 25% and 50% (V25 and V50). It was found that the glass powder addition in the formulations caused decrease in flexion resistance and increase in water absorption values. However, the melting action of glass powder reduced the sintering temperature in regards with the standard mixture in 150 °C for substitutions of 50% and 25%, respectively. By using Scanning Electron Microscopy (SEM) needles of primary mullite and secondary mullite (elongated needles) in a vitreous phase were identified.

Palavras-chave : feldspar; glass; glass powder; porcelain stoneware tile.

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