混合碱/碱土金属效应对中温熔块釉耐碱性的影响

Influence of Mixed Alkali-Alkaline Earth Effect on Alkali Resistance of Medium Temperature Fritted Glaze

为了提高中温熔块釉的耐碱性,通过大量实验得到较好的基础熔块釉组成,在此基础上,探讨混合碱金属效应、混合碱土金属效应对熔块耐碱性的影响。结果表明:Li2O和Na2O两种碱金属氧化物存在"混合碱金属效应",其摩尔比为1时,熔块耐碱性最佳。氧化钙对碱金属(Li2O+Na2O)的压制效应明显,当CaO/(Li2O+Na2O)为1.22时,熔块耐碱性最好。二元碱土金属混合时,CaO/BaO、CaO/MgO摩尔比均为8.2时耐碱性最好,但BaO的效果要大于MgO;三元碱土混合中,CaO∶MgO:BaO摩尔比为14:3.3:1时,熔块耐碱性最高,且此时釉的耐碱性也最强。

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, inlfuence 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.