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Whiteware and Glazes
Published in Debasish Sarkar, Ceramic Processing, 2019
Bisque-fired or biscuit-fired bodies are unglazed fired bodies with a matte finish. The texture on the outer surface gives very good aesthetic value. This kind of body contains no or very little glassy structure on the surface. The main purpose of biscuit firing is to make the body impervious to water, resistant to damage during handling, and absorbent for glazing. The biscuit firing temperature is essential to control in the target of porosity left, formation of glassy structure and phases during firing that eventually help to final-stage glazing on the body. The employed thermal energy provides the activation energy to complete the different chemical reactions. The basic chemical reactions that occur during this process areRemoval of physically combined H2OStructural breakdown of clay and removal of chemically combined H2OFormation of primary mullite phaseGrowth of primary mullite crystalsFormation of eutectic liquid of quartz and fluxDissolution of quartz into the eutectic liquidFormation of acicular secondary mullite crystalsGrowth of secondary mullite crystalsExcess SiO2 remains as residual cristobalite and tridymiteGradual transformation of residual SiO2 to quartz
Automatic Classification of Blue and White Porcelain Sherds Based on Data Augmentation and Feature Fusion
Published in Applied Artificial Intelligence, 2022
Yanzhe Liu, Bingxiang Liu, Jiajia Yu, Jingwen Xia, Canfei Luo
Jingdedzhen, one of the main porcelains productional area of China, where many porcelains are unearthed every year. Among them, the blue and white porcelain of the Yuan, Ming and Qing Dynasty is the most famous and precious. These blue and white porcelains use CoO as the pigment and are painted on the biscuit (unfired porcelain) with the technique of Chinese painting. These patterns are not only an important reference for the study of social economy and culture, but also an important basis in ceramic restoration.