Bullers ring A type of pyrometric device. Sèvres Porcelain which is used to determine the dry material content suspended in a clay or glaze slip. Brongniart's formula A mathematical formula developed by Alexandre Brongniart of In this state, the article is very fragile, non-plastic and porous. ( W)īone-dry The final stage of greenware dried to a near or fully dry state and ready to be fired. ( W)īone china Vitreous, translucent pottery made from a body of the following approximate composition: 45-50% calcined bone, 20-25% kaolin & 25-30% china stone. Bone ash Calcined animal bone used in the production of bone china. Body The structural portion of a ceramic article, or the material or mixture from which it is made. Undertaken in large tanks called blungers. Blunging The energetic mixing of ceramic raw materials, especially clays, with water to produce slip or slurry. Bloating The permanent swelling of a ceramic article during firing caused by the evolution of gases. Biscuit firing The first firing prior to glazing and subsequent additional firing. Occasionally also bisque.( W) Bisque porcelain Unglazed porcelain as a final product, with a matt surface resembling marble. Biscuit Pottery that has been fired but not yet glazed. Bentonite An extremely plastic clay rich in montmorillonite which can be added in small quantities to clays or clay bodies to increase plasticity. Used to reduce the adherence of ware during firing. Batt wash A thin refractory coating, often calcined alumina, applied in slurry form to batts. Also, a flat piece of kiln furniture on which ware is placed in a kiln. Batt Less commonly also known as a "batterboard", thin slab of wood, plaster or plastic used to support ware during shaping. Band Lines marked around circular ceramic utensils (such as plates, jars or lids) using any method of decoration which can be applied at all stages of manufacture. Ball mills can also be used to mix ceramic bodies. Ceramic raw materials which are commonly milled include quartz, feldspar and calcined alumina. Size reduction of the feed materials is achieved by a combination of impact and attrition resulting from the tumbling of hard media, such as pebbles, inside the mill during the rotation of the mill. They commonly exhibit high plasticity and high dry strength.( W) Ball mill A cylindrical grinder used to grind, or mill, raw materials for use in ceramic bodies or glazes. Ball clays invariably also contain various non-clay minerals, and sometimes organic matter. Various techniques to apply the stamp exist. B Backstamp A small mark applied to the underside, the back, of articles to give information such as the identity of maker. Influences the fired colour of bodies and glazes. Can be oxidising (an excess of oxygen) or reducing (a deficiency of oxygen). Atmosphere The gaseous environment within the kiln during the firing process. To prevent sedimentation is gentle agitated by slowly rotating blades. Alumina A major component of the chemical composition of clays, clay bodies and most glazes. A Absorbency The ability of a material to soak up water. This is a list of pottery and ceramic terms.ĭefinitions in Wiktionary are noted as "(W)".
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