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Greenware (pottery)
This is a list of pottery and ceramic terms. :''Definitions in Wiktionary are noted as "(W)".'' A B C D E F G H I J K L M O P :Published definitions of Pottery include: :-- "All fired ceramic wares that contain clay when formed, except technical, structural, and refractory products." :-- "China, earthenware and any article made from clay or from a mixture containing clay and other materials." :-- "A class of ceramic artifacts in which clay is formed into containers by hand or in molds or with a potter's wheel, often decorated, and fired" :-- "The term pottery includes many varieties of ware from the crudest vessels of prehist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wiktionary
Wiktionary ( , , rhyming with "dictionary") is a multilingual, web-based project to create a free content dictionary of terms (including words, phrases, proverbs, linguistic reconstructions, etc.) in all natural languages and in a number of artificial languages. These entries may contain definitions, images for illustration, pronunciations, etymologies, inflections, usage examples, quotations, related terms, and translations of terms into other languages, among other features. It is collaboratively edited via a wiki. Its name is a portmanteau of the words '' wiki'' and '' dictionary''. It is available in languages and in Simple English. Like its sister project Wikipedia, Wiktionary is run by the Wikimedia Foundation, and is written collaboratively by volunteers, dubbed "Wiktionarians". Its wiki software, MediaWiki, allows almost anyone with access to the website to create and edit entries. Because Wiktionary is not limited by print space considerations, mos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crock (dishware)
A crock is a pottery container sometimes used for food and water, synonymous with the word pot, and sometimes used for chemicals. Derivative terms include crockery and crock-pot. Crocks, or "preserving crocks," were used in household kitchens before refrigeration to hold and preserve foods such as butter, salted meats, and pickled vegetables. Crocks are made from stoneware, which is a nonporous ceramic that is water-tight, even without glaze. Larger crocks (20-30 gallons) are used for curing meats. The meat is covered with a brine made of water, sugar, salt, and a small amount of sodium nitrate or salt peter. The meat is kept submerged in the brine by two semicircle weights designed to fit inside the crock. The crocks are then topped with a lid and stored in a cool, dry location. Smaller crocks (1-10 gallons) are commonly used for preserving vegetables such as cucumbers for pickles, and cabbage for sauerkraut. Preserving food in this manner allows people to keep summer veget ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crazing
Crazing is the phenomenon that produces a network of fine cracks on the surface of a material, for example in a glaze layer. Crazing frequently precedes fracture in some glassy thermoplastic polymers. As it only takes place under tensile stress, the plane of the crazing corresponds to the stress direction. The effect is visibly distinguishable from other types of fine cracking because the crazing region has different refractive indices from surrounding material. Crazing occurs in regions of high hydrostatic tension, or in regions of very localized yielding, which leads to the formation of interpenetrating microvoids and small fibrils. If an applied tensile load is sufficient, these bridges elongate and break, causing the microvoids to grow and coalesce; as microvoids coalesce, cracks begin to form. Polymers Crazing occurs in polymers, because the material is held together by a combination of weaker Van der Waals forces and stronger covalent bonds. Sufficient local stress ov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrometric Cone
Pyrometric cones are pyrometric devices that are used to gauge heatwork during the firing of ceramic materials. The cones, often used in sets of three, are positioned in a kiln with the wares to be fired and provide a visual indication of when the wares have reached a required state of maturity, a combination of time and temperature. Thus, pyrometric cones give a ''temperature equivalent''; they are not simple temperature-measuring devices. Definition The pyrometric cone is "A pyramid with a triangular base and of a defined shape and size; the "cone" is shaped from a carefully proportioned and uniformly mixed batch of ceramic materials so that when it is heated under stated conditions, it will bend due to softening, the tip of the cone becoming level with the base at a definitive temperature. Pyrometric cones are made in series, the temperature interval between the successive cones usually being 20 degrees Celsius. The best known series are Seger Cones (Germany), Orton Cones (U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clay
Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4). Clays develop plasticity when wet, due to a molecular film of water surrounding the clay particles, but become hard, brittle and non–plastic upon drying or firing. Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. Clay is the oldest known ceramic material. Prehistoric humans discovered the useful properties of clay and used it for making pottery. Some of the earliest pottery shards have been dated to around 14,000 BC, and clay tablets were the first known writing medium. Clay is used in many modern industrial processes, such as paper making, cement production, and chemical filtering. Between one-half and two-thirds of the world's population live or work in buildings made with clay, oft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
