中温氧化双层花釉的制备及研究

Preparation and Research of Medium-Temperature Oxidized Double-layer Fancy Glaze

以分相/析晶乳浊釉为面釉、以透明釉及其外加6 wt% Fe2O3为底釉在中温氧化烧成条件下制备得到系列双层花釉。通过体视显微镜和SEM/EDS对铁着色底釉双层花釉釉样表面及断面进行观测和微观成分分析,并研究了工艺因素对其釉面效果的影响。结果表明:Fe2O3着色釉作为双层花釉的底釉制备得到的釉面效果较透明釉更加稳定,釉面均为白色与褐色相间的蜘蛛网格式图纹,釉料酸碱性差异主要体现为铁在底釉中的不同呈色效果;釉面白色区域主要分布有大尺寸长晶和分相液滴,P元素含量较高、Fe元素含量较低,褐色区域Fe元素含量较高、P元素含量较低;釉面网格状花纹是Fe2O3熔融反应产生的气泡在釉层中搅动和排出釉面时将底釉成分迁移扩散至釉面形成。当升温速率在5~10℃/min、底釉与面釉施釉重量比值D/M在3.5~5.84时可获得稳定的白色/褐色相间网格状图纹效果。

A series of double-layer fancy glazes were prepared,using the phase-separated/crystallized opaque glaze as the top glaze,the transparent glaze and transparent glaze add 6 wt%Fe2O3 as the base glaze.The surface and section of glaze with the iron colored glaze as the base glaze were observed and analyzed by stereo microscope and SEM/EDS,meanwhile,the effect of preparation technology factors on the glaze performance was investigated.The results show that the double-layer fancy glaze prepared with Fe2O3 as the base glaze is more stable than the transparent glaze as the base glaze.All glazes are white and brown cross-linked to show a spider-like pattern.The difference of glaze acidity and alkalinity is mainly reflected in the different color effect of iron in the bottom glaze.The white areas of the glazed surface are mainly distributed with large size crystals and phase-separated droplets,where the content of P element is higher and the Fe element is lower.While the content of P element is lower and the Fe element is higher in the brown areas.The glazed grid pattern is formed when the bubbles generated by the melting reaction of Fe2O3 are stirred in the glaze layer and discharged from the glaze.When the heating rate is 5~10℃/min and the weight ratio D/M of the base glaze to the top glaze is 3.5 to 5.84,the stable white and brown grid pattern can be obtained.