Study on the Influence Mechanism of SiO2/Al2O3 on the "Pear Peel Pattern" of Black Glaze in Jizhou Kiln
"Pear peel pattern" is one of the typical characteristics of the black glaze of Jizhou Kiln. This paper focuses on the black glaze of Jizhou Kiln,using kaolin,pteris multifida ash and talc as the main raw materials to replicate the "pear peel pattern" black glaze of Jizhou Kiln. By exploring the effects of SiO2/Al2O3 on the microstructure and properties of the black glaze in Jizhou Kiln,the formation mechanism of the unique "pear peel pattern" glaze was revealed. The results show that when the content of SiO2 is in the range of 4.0～5.0 mol and the Al2O3 content is in the range of 0.55～0.60 mol (SiO2/Al2O3:6.6～9.1),the glaze surface exhibits a unique "pear peel pattern" fold texture similar to that of Jizhou Kiln black glaze porcelain. This is mainly due to the increased viscosity of the glaze melt caused by high SiO2 and Al2O3 content during the high-temperature firing and cooling process. At the same time,the decomposition of iron oxide in the glaze layer produces phase separation,generating a small amount of hematite and calcium feldspar,as well as residual quartz crystals,thus forming a wrinkled black texture of "pear peel pattern" characteristics on the glaze.
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