Papers by Keyword: Glaze

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Authors: M. Pereira, T. de Lacerda-Arôso, M.J.M. Gomes, A. Mata, L.C. Alves, Philippe Colomban
Abstract: Ancient ceramic wall tiles, called “azulejo”, firstly used on Portuguese churches, monasteries and palaces (15-18th century) have progressively been used in particular houses till the last century. These tiles and its use in huge decorative panels can be considered as a precious but fragile cultural heritage from Brazil to India, in several countries influenced by Portuguese culture. Morphologically, these tiles are composed by a porous clay-based ceramic body, the terracotta, covered by a protective glassy phase, the glaze. As artistic paintings, these murals incorporated various kinds of pigments in the glaze layer to create a pictorial impact on the walls of rich palaces or churches, real and durable monumental works-of-art. In the 21st century, degradation marks are visible on these ceramic tiles because of their use under corrosive conditions (moisture, atmospheric cycles…) along centuries. In order to promote their conservation and enhance their restoration, the physical-chemical characterization of the azulejos is performed in the present work, using mainly non-destructive processes like micro-Raman spectroscopy or X-Ray diffraction. In particular, Raman spectroscopy allows the detection of some nano/microcrystals present in the amorphous glaze due to pigments or opacifying agents or related to the elaboration process of the azulejo. Based on the observation of various selected fragments, one states that very few pigments have been used as colouring agents in this ceramic art during 17-18th centuries. Thus, the relationship between the different colours, the introduced pigments and the structural aspects of the glass will be focused. Some features related with the ancient ceramic technology will also be discussed.
Authors: Maria Preda, Hans Helmut Rehner
Authors: Virginia Burghelea, I. Stoian, G. Mănucu-Adameşteanu, I. Poll, Iuliana Pasuk
Authors: Tiziano Manfredini
Authors: I. Perrin, B. Velde
Authors: Josefina Pérez-Arantegui, Pilar Lapuente, Pilar Punter, Juan R. Castillo
Authors: Kyung Nam Kim, Sung Jin Kim
Abstract: In this study, the characteristics of porcelain body, glaze and inlay were analyzed, using Koryo celadon shard of 10th-14th century. The characterization of celadon shard were investigated by Scanning electron microscopy, X-ray fluriscence, X-ray diffractometer, and Dilatometer. The characteristics of celadon shard is similar in color to gray-green with the naked eye, and the thickness of glaze layer and body is about 149.5-200μm and 4.2-8.8mm. The chemical compositions of body is SiO2 70.9-74.8wt%, Al2O3 19.4-20.5wt%, RO▪RO2(R=Ca, Mg, K) 4.0-7.0wt% and Fe2O31.3-2.7wt% in weight ratio. The high contents (12.5-24.6wt%) of calcium oxide in the glaze is considered lime type. In the chemical compositions of the white and black inlay Al2O3 is 33.2-37.1wt% and 19.7wt%, and Fe2O3 is 1.1wt% and 5.6wt% in weight ratio, respectively. The density of black inlay is higher than that of white inlay, and firing temperature for celadon may be about 1250°C.
Authors: Toyohiko Sugiyama
Abstract: In the research of ceramic glazes, the process of preparing the glaze test pieces and improving the recipe is repeated. Our institute, AIST Japan, has more than 300,000 glaze test pieces from over 80 years of ceramic studies. These pieces are the physical evidence of the processes and the results of glaze test experiments. As such, they provide valuable information for glaze and ceramic research. The Ceramic Color Database has been constructed to make this fundamentally important information widely accessible in support of R&D in the ceramics industry. The database includes: glaze name, firing temperature, firing atmosphere, coloring, chemical composition, recipe, physical state, and other information, as well as images of the glaze pieces. The database has been used in recent ceramics research, and its effectiveness has been verified. It was also recognized that the vast amount of data provided by the database is useful in the material development and basic research of fields other than ceramics. The database has been improved based on such usage status. In this paper, the structure and usage of the database are described and the future development of the database is discussed.
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