R_2O-RO-B_2O_3-SiO_2-Al_2O_3系统快烧分相乳浊釉不混溶结构的形成及演变

Formation and Development of Liquid-Liquid Immiscibility Structure of Fast-Fired Phase-Separative Glazes in R_2O(K_2O,Na_2O)-RO(CaO, MgO, ZnO)- Al_2O_3-B_2O_3-SiO_2 system

本文选择R_2O(K_2O,Na_2O)-RO(CaO,MgO,ZnO)-Al_2O_3-B_2O_3-SiO_2系统中的典型组成,研究了在快速烧成条件下,该系列釉不混溶结构的形成规律。结果表明:不混溶结构中,深色相富Ca、Zn、Mg,贫Si、B、Al;浅色相则相反。较低(SiO_2+B_2O_3)含量时,易形成三维连通结构;较高(SiO_2+B_2O_3)含量时,则形成孤立液滴相结构。要使烧成的釉层的显微结构发展成为接近可见光波长范围尺度的分相结构、并得到光亮乳白的外观,以不混溶温度几稍低于釉烧温度较为合适。

Formation rule for liquid-liquid immiscibility structure of fast-fired typical glaze compositions in R2O(K2O,Na2O)-RO(CaO,MgO,ZnO)-Al2O3-B2O3-SiO2 system was studied. The results showed that one phase is rich in R2+ and poor in Si4+、 B3+ and Al3+ in the phase-separation structure, the other phase is reversed. Isolated droplet structure formed with higher ( SiO2 + B2O3 ) concentration, while three-dimensional connection structure formed with lower(SiO2 + B2O3) concentration. Tb should be lower than Tx but the difference between them should not be too large to ensure the phase-separation structure to be close to the wavelength range of visible light. This enables the resultant glaze surface to appear white and glossy.