LUO Ting, WU Junming, GU Xingyong, LU Pandeng

（Jingdezhen Ceramic Institute, Jingdezhen Jiangxi 333001）

Abstract: The single factor and multi-factor glaze system adjusting schemes for designing the glaze formula were used in this research. The effects of n (SiO₂)/n (Fe₂O₃) ratios and types and amounts of alkali oxides on glaze phase separation were studied by observing the base glaze color and crystal amount and crystallization behavior of different formulas. The research results show that the SiO₂/Fe₂O₃ molar ratio could influence the phase separation of glaze melts which will affect the color of the base glaze and the amount of crystals deposited on the glaze surface. The crystallization attains the best effect when the n(SiO₂)/n(Fe₂O₃) ratio changes from 6.25 to 7.5. There is no crystal on the surface of the glaze with the ratio greater than 10. The types and amounts of alkali oxides will affect the color and amount of α- Fe₂O₃ crystal.

Keywords:  n(SiO₂)/n(Fe₂O₃) ratio; phase separation; crystallization; glaze system adjusting scheme