QIN Libang, LU Xilong, CAO Chun'e, CHEN Yunxia, SHEN Huarong, HUANG Gang
(JJingdezhen Ceramic Institute, Jingdezhen, 333403, Jiangxi, China)
Abstract: In order to improve the alkali resistance of medium temperature fritted glaze, a large number of experiments were carried out to get a better base fritted glaze. Then, influence of mixed alkali metal effect and mixed alkaline earth metal effect on alkali resistance of the glaze was studied. Results show that mixed alkali effect existed in two alkali metal oxides – Li2O and Na2O. When the Li+/Na+ molar ratio was equal to 1, the frit had the best alkali resistance. Calcium oxide had obvious suppression effect on alkali metal oxides. When the CaO/(Li2O+Na2O) molar ratio was equal to 1.22, the frit had the best alkali resistance. For binary mixed alkali metal oxides, when both the molar ratios of CaO/ BaO and CaO/MgO were equal to 8.2, the frit had the best alkali resistance, but BaO worked better than MgO. For ternary mixed alkali metal oxides, when the molar ratio of CaO: MgO: BaO was equal to 14: 3.3: 1, both the frit and fritted glaze had the best alkali resistance.
Key words: medium temperature frit glaze; mixed alkali effect; mixed alkaline earth effect; alkali resistance