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. The place where such wares are made is also called a pottery . Pottery can also refer to the material of which the potteryware is made. Major types of pottery include earthenware, stoneware and porcelain. Pottery is one of the oldest human technologies and art-forms, and remains a major industry today 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, part of the group of industrial minerals, 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 almost entirely of calcic 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. The place where such wares are made is also called a pottery . Pottery can also refer to the material of which the potteryware is made. Major types of pottery include earthenware, stoneware and porcelain. Pottery is one of the oldest human technologies and art-forms, and remains a major industry today. 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 in few nations, such as United States and 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 that is composed of bone ash, feldspathic material and kaolin. It has been defined as 'ware with a translucent body containing a minimum of 30% of phosphate derived from animal bone and calculated calcium phosphate. Developed by English potter Josiah Spode, bone china is known for its high levels of whiteness and 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, which, though dense, impermeable and hard enough to resist scratching by a steel point, differs from porcelain because it is more opaque, and normally only partially vitrified. It may be vitreous or semi-vitreous. It is usually coloured grey or brownish because of impurities in the clay used for its manufacture, and is normally, but is less expensive and easier to work. 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 Central Eurasia and Western Asia. The name Iran has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was also known to the western world as Persia. Both Persia and Iran are used. 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 century
- 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, although the term can also be applied to glazed ceramics where the fired body is porous and red in color. 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
See also
- Pottery Pottery is the ceramic ware made by potters. The place where such wares are made is also called a pottery . Pottery can also refer to the material of which the potteryware is made. Major types of pottery include earthenware, stoneware and porcelain. Pottery is one of the oldest human technologies and art-forms, and remains a major industry today
- 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, although the term can also be applied to glazed ceramics where the fired body is porous and red in color. 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
- Stoneware "Stoneware, which, though dense, impermeable and hard enough to resist scratching by a steel point, differs from porcelain because it is more opaque, and normally only partially vitrified. It may be vitreous or semi-vitreous. It is usually coloured grey or brownish because of impurities in the clay used for its manufacture, and is normally
References
- Rado, P. An Introduction to the Technology Of Pottery. 2nd edition. Pergamon Press Pergamon Press was an Oxford-based publishing house, founded by Robert Maxwell, which published scientific and medical books and journals, 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
- Tin-glazed earthenware livery-button, ca 1651, Victoria & Albert museum The Victoria and Albert Museum , in The Royal Borough of Kensington & Chelsea, London, England, is the world's largest museum of decorative arts and design, housing a permanent collection of over 4.5 million objects. Named after Prince Albert and Queen Victoria, it was founded in 1852, and has since grown to now cover some 12.5 acres (0.05 km2) jewellery collection The Victoria and Albert Museum , in The Royal Borough of Kensington & Chelsea, London, England, is the world's largest museum of decorative arts and design, housing a permanent collection of over 4.5 million objects. Named after Prince Albert and Queen Victoria, it was founded in 1852, and has since grown to now cover some 12.5 acres (0.05 km2)
Categories: Ceramic materials Categories: Materials | Crystalline solids | Ceramic engineering | Pottery Categories: Art media | Arts and crafts | Crafts | Plastic arts | Ceramic art | Crockery
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