SHI Jijun, SUN Guoliang, XIAO Zhuohao, LI Xiuying, YU Feng, CHENG Lei
(National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen Ceramic University, Jingdezhen 333001, Jiangxi, China)
Abstract: The effects of sintering processes on color appearance and microstructure of glazes based on Fe2O3-SiO2-Al2O3 system were studied with red clay, potash feldspar, calcite, talc and ferric oxide as raw materials. Phase composition, microstructure and micro-area composition of the glazes were characterized by using XRD, Raman, SEM and EDS, respectively. The results shows that the glazed processed in reducing environment were black, due to the phase separation and crystallization, forming brown speckles with diameters of 2 mm. With increasing reduction cycles, the brown color was gradually became silver. Blue-purple-yellow-green multiple color could be present in the quenched samples, making them potential as glazes for daily and art ceramics.
Key words: iron glaze; sintering processes; reduction reaction; cooling; color appearance