原料配方对仿汝瓷青釉呈色的影响

摘要

The chemical composition of Ru celadon Guan ware unearthed from the Qingliangsi kiln of Song Dynasty was analyzed for designing the glaze formula. The effects of n(SiO2)(Al2O3) molar ratios, Fe2O3 content, CaO and MgO molar ratio, replacement of agate with quartz on the glaze formula were studied by observing the replica glaze color generation and X-ray diffraction pattern. The results showed that the n(SiO2)(Al2O3) molar ratio can inlfuence the forming of crystals deposited on the glaze surface which will change the glaze from glossy to semi-mat and mat. The replica glaze has the best color generation when the n(SiO2)(Al2O3) molar ratio is 5.7 and the molar values of CaO, MgO and Fe2O3 are 0.70, 0.15, 0.025 respectively in the glaze formula. Additionally, there are a small number of phase-separated droplets and a large number of crystals on the microstructure of the replica glaze prepared with agate replacing quartz.%以宋代汝官窑青瓷标本化学组成为基础，分别探讨了Si/Al 摩尔比、Fe2O3含量、CaO与MgO的比例，及玛瑙替代石英对仿汝瓷青釉外观呈色的影响。结合X射线衍射和色度分析，结果表明：随着Si/Al 摩尔比的增大，釉面呈现从光亮→半无光→无光的变化趋势，其中Si/Al摩尔比为5.7、釉式中CaO含量为0.70、MgO含量为0.15、Fe2O3含量为0.025时的样品外观呈色与宋代汝官窑青釉最为接近。此外，对比分析玛瑙和石英在仿汝瓷青釉中的作用发现，采用石英配制的釉中分相现象非常普遍、但析晶相对较少，而采用玛瑙配制的釉中则存有大量的晶体，但分相相对较少。