Earthenware is a common ceramic A ceramic is an inorganic, non-metallic solid prepared by the action of heat and subsequent cooling. Ceramic materials may have a crystalline or partly crystalline structure, or may be amorphous . Because most common ceramics are crystalline, the definition of ceramic is often restricted to inorganic crystalline materials, as opposed to the non- material, which is used extensively for pottery Pottery is the ceramic ware made by potters. Major types of pottery include earthenware, stoneware, and porcelain. The places where such wares are made are called potteries. Pottery is one of the oldest human technologies and art-forms, and remains a major industry today. Ceramic art covers the art of pottery, whether in items made for use or tableware and decorative objects. Although body formulations vary between countries and even between individual makers, a generic composition is 25% ball clay Ball clays are kaolinitic sedimentary clays, that commonly consist of 20-80% kaolinite, 10-25% mica, 6-65% quartz. Localized seams in the same deposit have variations in composition, including the quantity of the major minerals, accessory minerals and carbonaceous materials such as lignite. They are fine-grained and plastic in nature, 28% kaolin Kaolinite is a clay mineral with the chemical composition Al2Si2O54. It is a layered silicate mineral, with one tetrahedral sheet linked through oxygen atoms to one octahedral sheet of alumina octahedra. Rocks that are rich in kaolinite are known as china clay, white clay, or kaolin, 32% quartz Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar. It is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2, and 15% feldspar Feldspars crystallize from magma in both intrusive and extrusive igneous rocks, as veins, and are also present in many types of metamorphic rock. Rock formed entirely of plagioclase feldspar is known as anorthosite. Feldspars are also found in many types of sedimentary rock. Earthenware is one of the oldest materials used in pottery Pottery is the ceramic ware made by potters. Major types of pottery include earthenware, stoneware, and porcelain. The places where such wares are made are called potteries. Pottery is one of the oldest human technologies and art-forms, and remains a major industry today. Ceramic art covers the art of pottery, whether in items made for use or. While red earthenware made from red clays is very familiar and recognizable, white and buff colored earthenware clays are also commercially available and commonly used.
Earthenware is commonly bisque, or biscuit, fired to temperatures between 1000 and 1150 °C Celsius is a temperature scale that is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. The degree Celsius (°C) can refer to a specific temperature on the Celsius scale as well as a unit to indicate a temperature interval (a difference between two temperatures (1800 and 2100 °F Fahrenheit is the temperature scale proposed in 1724 by, and named after, the physicist Daniel Gabriel Fahrenheit . Today, the temperature scale has been replaced by the Celsius scale in most countries. It is still in use for non-scientific purposes in the United States and a few other nations, such as Belize), and glost- (glaze-) fired from 950 to 1,050 °C (1,742 to 1,922 °F). However examples of the reverse — low biscuit and high glost firing — can also be found: this can be popular with some studio potters where bisque temperatures may be 900 to 1,050 °C (1,652 to 1,922 °F) with glost temperatures in the range of 1,040 to 1,150 °C (1,904 to 2,102 °F). The exact temperature will be influenced by the raw materials used and the desired characteristics of the finished ware. The higher firing temperatures are likely to cause earthenware to bloat. After firing, the body is porous and opaque with colours ranging from white to red depending on the raw materials used.
Earthenware may sometimes be as thin as bone china Bone china is a type of porcelain body first developed in Britain in which calcined cattle bone is a major component. It is characterised by high whiteness, translucency and strength. Production usually involves a two stage firing where the first, bisque, is without a glaze at 1280 °C (2336 °F), which gives a translucent product and then glaze, and other porcelains Porcelain is a ceramic material made by heating raw materials, generally including clay in the form of kaolin, in a kiln to temperatures between 1,200 °C and 1,400 °C (2,552 °F). The toughness, strength, and translucence of porcelain arise mainly from the formation of glass and the mineral mullite within the fired body at these high, though it is not translucent and is more easily chipped. It is also less strong, less tough, and more porous Porosity is a measure of the void spaces in a material, and is a fraction of the volume of voids over the total volume, between 0–1, or as a percentage between 0–100%. The term is used in multiple fields including pharmaceutics, ceramics, metallurgy, materials, manufacturing, earth sciences and construction than stoneware Stoneware a vitreous or semi-vitreous ceramic ware of fine texture made primarily from non-refractory fire clay, but its low cost and easier working compensate for these deficiencies. Due to its higher porosity Porosity is a measure of the void spaces in a material, and is a fraction of the volume of voids over the total volume, between 0–1, or as a percentage between 0–100%. The term is used in multiple fields including pharmaceutics, ceramics, metallurgy, materials, manufacturing, earth sciences and construction, earthenware must usually be glazed Glaze is a layer or coating of a vitreous substance which has been fired to fuse to a ceramic object to color, decorate, strengthen or waterproof it in order to be watertight.
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Types of earthenware
Painted, incised, and glazed earthenware. Dated 10th century, Iran Iran (Persian: ایران [ʔiˈɾɒn]), officially the Islamic Republic of Iran is a country in Western Asia. The name Iran has been in use natively and came into international use from 1935, before which the country was known internationally as Persia. Both "Persia" and "Iran" are used interchangeably in cultural context;. New York Metropolitan Museum of Art.- Creamware
- Delftware Delftware, or Delft pottery, denotes blue and white pottery made in and around Delft in the Netherlands and the tin-glazed pottery made in the Netherlands from the sixteenth to the eighteenth centuries
- Faience Faience or faïence is the conventional name in English for fine tin-glazed pottery on a delicate pale buff body, associated with Faenza in northern Italy. The invention of a white pottery glaze suitable for painted decoration, by the addition of an oxide of tin to the slip of a lead glaze, was a major advance in the history of pottery. The
- Tin-glazed pottery Tin-glazed pottery is pottery covered in glaze containing tin oxide which is white, shiny and opaque. The pottery body is usually made of red or buff colored earthenware and the white glaze was often used to imitate Chinese porcelain. Tin-glazed pottery is usually decorated, the decoration applied to the unfired glaze surface by brush as metallic
- Victorian majolica Victorian Majolica was originated by Mintons Ltd, who exhibited it at the Great Exhibition of 1851 under the name Palissy ware. The debt to the eccentric 16th century potter Bernard Palissy is obvious from its naturalistic plant and animal motifs molded in relief and splashed with bold color and clear glazes
- Raku Raku-yaki , or Raku ware, is a type of Japanese pottery that is traditionally and primarily used in the Japanese tea ceremony in Japan, most often in the form of tea bowls. It is traditionally characterized by hand-molding of the clay as opposed to turning it on a potter's wheel, resulting in each piece being "one-of-a-kind"; low firing
- Terra cotta Terracotta, Terra cotta or Terra-cotta is a clay-based unglazed ceramic. Its uses include vessels, water and waste water pipes and surface embellishment in building construction, along with sculpture such as the Terracotta Army and Greek terracotta figurines. The term is also used to refer to items made out of this material and to its natural,
See also
- Pottery Pottery is the ceramic ware made by potters. Major types of pottery include earthenware, stoneware, and porcelain. The places where such wares are made are called potteries. Pottery is one of the oldest human technologies and art-forms, and remains a major industry today. Ceramic art covers the art of pottery, whether in items made for use or
- Porcelain Porcelain is a ceramic material made by heating raw materials, generally including clay in the form of kaolin, in a kiln to temperatures between 1,200 °C and 1,400 °C (2,552 °F). The toughness, strength, and translucence of porcelain arise mainly from the formation of glass and the mineral mullite within the fired body at these high
- Terra Cotta Terracotta, Terra cotta or Terra-cotta is a clay-based unglazed ceramic. Its uses include vessels, water and waste water pipes and surface embellishment in building construction, along with sculpture such as the Terracotta Army and Greek terracotta figurines. The term is also used to refer to items made out of this material and to its natural,
References
- Rado, P. An Introduction to the Technology Of Pottery. 2nd edition. Pergamon Press Pergamon Press was an Oxford, United Kingdom based publishing house, founded by Robert Maxwell, which published scientific and medical books and journals. It was purchased by the academic publishing giant Elsevier in 1992, 1988.
- Ryan W. and Radford, C. Whitewares: Production, Testing And Quality Control. Pergamon Press, 1987.
- Hamer, Frank and Janet. The Potter's Dictionary of Materials and Techniques. A & C Black Publishers Limited, London, England, Third Edition, 1991. ISBN 0-8122-3112-0.
External links
- Digital Version of "A Representation of the manufacturing of earthenware" — 1827 text on the manufacture of earthenware
- Short film on pottery making around the world
Categories: Ceramic materials Categories: Materials | Crystalline solids | Ceramic engineering | Pottery Categories: Art media | Arts and crafts | Crafts | Plastic arts | Ceramic art | Crockery
San Francisco Bay Guardian
... they were swirled into a cream sauce heavy on pearl onions, then packaged in a nice earthenware crock under a gratin blanket of coarse bread crumbs. ...
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Gift of M F Tharp Earthenware vessel with applied decorations Unearthed in Throckmorton County Texas M47 1 2
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hu, 24 Dec 2009 10:36:11 GM
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