The effect of B2 O3 on the melting temperature of glaze from SiO2 -Al2 O3 -B2 O3 -Na2 O-Li2 O-K2-ZnO system by the heating microscope

Abstract

Glaze is a glass layer with the thickness about 0.1-0.4 mm coating on the surface of ceramic products. In the decoration, to ensure the color on the glaze and good adhesion with the base glaze, it is necessary to control the melting temperature of the glaze corresponding to the decoration temperature (700-850^o C). This article introduces the method of studying the influence of boric oxide (B₂ O₃ ) on the melting temperature of glaze from the system of SiO₂ -Al₂ O₃ -B₂ O₃ -Na₂ O-Li₂ O-K₂ O-ZnO. In this study, the content of B₂ O₃ varied from 5-30% by weight (%wt.) compared to the total remaining oxides. The melting temperature of glaze was determined by the Leiz heating microscope; the chemical composition of raw materials was determined by X-ray fluorescence (XRF); and the phase composition of glaze was investigated by X-ray diffraction (XRD) analysis.