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Vitreous enamel

History
Enameling is an ancient and widespread adoption of technology. The ancient Egyptians applied enamels to pottery and stone objects. The old Greeks, Celts, Russians and Chinese also enameling processes on metal objects.
Enamelling was also used during the Roman glass vessels Time decorating, and there is evidence for this so early in the late Republican and early Imperial period in the Levant, Egypt, Great Britain and the Black Sea. Enamel powder can be produced in two ways: either by grinding colored glass, or the mixture of colorless glass with dyes such as a metal oxide. Models were either open market or over the top of the outline cuts painted, and created the technology well into the metal. Once painted, enamelled glass vessels needed to high if the temperature enough to melt the applied powder can be fired, but low enough that the fabric of the ship itself was not melted. The production is thought up to a peak in the Claudian period came and stayed for some 300 years, although archaeological evidence for this technique to about forty vessels or vessel fragments limited.
From more recent history, the bright, jewel-like colors are a preferred choice for designers of enamel jewelry and trinkets, such as the fantastic eggs of Peter Carl Faberg, enamelled copper wire boxes of Battersea enamellers, and artists such as George Stubbs and other painters of portrait miniatures. Enameling was a favorite technique of the Art Nouveau jewelers.
St. Gregory the Great in Limoges enamel: enamel on copper, by Jacques I Laudin
Properties
Enamel powder is often applied as a paste and can be transparent or opaque when fired, vitreous enamel can be applied to most metals. It has many good properties: it is smooth, hard, chemically resistant, durable, can be brilliant, vibrant colors, accept and can not burn. Its disadvantages are its tendency to crack or shatter when the substrate is stressed or bent. His Durability it has for many functional applications: early 20th Century advertising signs, interior oven walls, cooking pots, cast exterior walls of kitchen appliances, Iron bathtubs, farm storage silos, and processing equipment such as chemical reactors and pharmaceutical chemical process tanks. Commercial structures such as gas stations, bus stops Lustron houses and even walls, ceilings and structural elements had the porcelain enamel steel.
Color in enamel is obtained by the addition of various minerals, often Metal oxides cobalt, praseodymium, iron, or neodymium. The last creates delicate shades of purple wine with pure red and warm gray. Enamel can be either transparent, opaque or iridescent (Translucent), which is a variety that gains a milky opacity the longer it is raised. Different enamel colors can not mix a new color, painting in style. This creates tiny spots of each color, although the eye by grinding colors together to an extremely fine, flour-like, powder can be tricked.
Techniques the enamel
A hands-free enameled painting by Einar Hákonarson in the forest. 1989
Stations of the Cross,
Notre-Dame-des-Champs, Avranches
Lower Waist from the French word for "low cut". The surface of the metal with a low relief design which can be seen through translucent and transparent enamels established.
Champleve, French for "raised field", where the surface pits out, in which enamel is fired form is carved, the original Metal exposed.
Cloisonné, French for "cell", where thin wires are applied include increased barriers to different areas (hereinafter applied) enamel form.
Enamel painting, is a design in enamel on a flat surface painted. Grisaille and Limoges enamel are subategories of enamel painting.
Grisaille, French and means "graying", where dark, often blue or black background is used, then Limoges (Limoges porcelain) or opalescent (Translucent) enamel is applied above, increases building designs in a monochrome gradient, paler as the thickness of the layer of light color.
Limoges enamel, Limoges, France, the most famous European center of enamel production.
Limoges porcelain, after the city in France, where he invented called, is the technique of "Image" with a special paint called "blanc de Limoges" over a dark enamelled surface, a detailed picture, often human figure form. It is a form of grisaille.
Plique – jour, French for the enamel, is applied where the cells to "keep fabric in daylight" similar to cloisonne, But without support, so that light through the transparent or translucent enamel finish. It has a stained glass look.
Ronde Bosse, French for "round Hump. "A 3D-Art enameling where a sculptural form is completely or partly enameled.
Stenciling, where a mask placed over the work and the enamel powder is over the top sieve. The stencil is removed before firing, the enamel stay in a pattern, slightly raised.
Sgraffito, where an unfired layer of enamel on a previously fired layer of enamel of a contrasting color is applied and then partially with a tool, just to create the design.
Counter enameling, not necessarily a technique, but a necessary step in many techniques to be applied, melting on the back of a piece as well – sandwiching the metal – less stress on the glass, so do not make it to crack.
Industrial Enamel
Enamel was first commercially applied to the sheet metal and steel in Germany and Austria in 1850. Industrialization increased the purity of raw materials increased and costs reduced. The wet application process began with the discovery of the use of clay to frit to suspend in water. Developments the twentieth century followed during the enameling class are steel, cleaned surface preparation, automation and continuous improvement of efficiency, Performance and quality.
The key ingredient of industrial enamel is a highly friable form of glass called frit. Is typically an alkali borosilicate frit chemistry with thermal expansion and glass transition temperature suitable for coating of steel. Raw materials are smelted together between 2100 and 2650F (1150 and 1450C) into a liquid Glass from the furnace and thermal shock with water or steel rollers is addressed in frit.
There are three main types of frit. First base coats contain-smelted in transition metal oxides such as cobalt, nickel, copper, manganese and iron to facilitate the adhesion to steel. Second, clear and semi-opaque frits contain some ink for the manufacture of paints. Finally, are titanium white coat frits with titanium dioxide, which produces a bright white color saturated when burning.
After melting, the frit in one of the three main forms the enamel coating material to be processed. First of wet process porcelain enamel slip (or slurry) is charged a high-solids product grinding the frit with clay and other Viscosity controlling electrolytes. Second, ready-to-use (RTU) is a cake-mix form of the manure wet process that soil is dry and can be reconstituted by mixing water at high shear. Finally, electrostatic powder coating applied as a powder by milling frit with a trace level of the proprietary additives can be produced.
Most industrial enamel is applied in accordance with ASTM A424 compliant enameling steel. The carbon in enameling steel is controlled to reactions at the enameling firing temperatures to prevent. Some porcelain is on aluminum, cast iron or hot-rolled steel. On steel sheet, a primer is put on the first layer to create the liability. The only Surface preparation for modern floor finishes required is a simple degreasing of steel with a mildy alkaline solution.
The frit smelted in the primer contains cobalt and nickel and other transition metal oxides on the enamel-steel bonding catalyze reactions. During firing of tooth enamel in between 1400 and 1640F (760 to 895C), iron oxide scale first forms on the steel. The molten enamel dissolves iron oxide and cobalt and nickel deposits. The iron has the anode in an electrochemical galvanic reaction in which the iron is oxidized again solved by the glass and oxidized again with the available cobalt and nickel limitation of the reaction. Finally, the surface is roughened anchored to the glass in the holes. White and colored second "cover" coats of paint are applied over the fired primer. For electrostatic enamel, the enamel-colored powder directly over a thin unfired primer "base coat" layer, to cooperate with the outer layer in a very efficient process is triggered two-coat/one-fire be applied.
The baked enamel dish is a perfect combination of laminated glass and metal. The enamel coating has excellent chemical resistance, corrosion resistance, scratch resistance (5-6 on the Mohs scale), lasting color fastness, washability, and is not flammable. Enamel is Glass, not paint, so it does not fade with UV light. Modern porcelain enamels are chip and impact resistance because of good thickness control. Typical applications in the home of enamel are Ovens, washing machines, sinks, bathtubs, glass-water heaters, cookware, bakeware and barbecue lined. Industrial applications include boilers, heat exchangers, architectural Panels and electronic circuits. Some new developments in the last ten years include melting / non-stick coatings, hybrid, sol-gel functional top-coats for porcelain enamels; Emails with a metallic appearance and easy to clean new technologies.
See also
Wikimedia Commons has media related to to: Enamel
Cloisonne – An old metal-working technology with an e-mail process.
Nineveh
Rostov the Great – a city known for its enamel work.
Silicon – The main component of enamel.
Franz Ullrich – Founder a German enamelware factory.
Staffordshire Moorlands Pan, a 2nd Century bronze trulla.
Ceramic glaze
Notes
^ Gullick, JT and Timbs, J., "Painting Popularly known, said: "Kent & Co in London, 1859, quoted by M. de Laborde," Notice of Emaux du Louvre "
^ Abcd Rütti, B., Early enameled glass, in Roman Glass: two centuries of art and invention, M. Newby and K. Painter editor. 1991, Society of Antiquaries London: London.
^ Gudenrath, W., enameled glass vessels, 1425 BC – 1800: The decoration process. Journal of Glass Studies, 2006. 48
External Links
Email German Confederation (German enamel Association (U.S.)
An Interview with Contemporary Enamel Artist Laura Zell
Mechanical and physical properties of glass enamel
IVE Institute for emails Enamellers (UK)
Glass / Metal Magazine Online (U.S.)
CIDA Center for Information and spread the art of enamelling (ES)
Society of the Netherlands Enamellers (NL)
The enamel painter Society (U.S.)
Guild of enamellers, UK
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Jewellery
Forms
Anklet bracelet Buckle Belly Chain Chatelaine Brooch Pin Necklace Earring Cufflink Crown Ring Tiara Tie Clip Watch (pocket)
Making
People
Bench Jeweler Goldsmith Jewelry Designer Lapidary watchmaker
Processes
Casting (centrifugal, investment casting, vacuum) enamelling engraved filigree metal tone plating polishing repousse and chasing Soldering Stone Setting Wire Wrapping
Tools
Draw plate file hammer expansion tools
Materials
Precious metals
Gold Palladium Platinum Rhodium Silver
Precious metal alloys
Britannia silver Electrum Gold Crown Gold Platinum Sterling Silver Sterling Shakudo Shibuichi Tumbaga
Base metals / alloys
Brass bronze copper tin Kuromido Stainless steel titanium
Mineral Gems
Aventurine Agate Alexandrite Amethyst Aquamarine Carnelian Citrine Diamond Emerald Garnet Jade Jasper Malachite Lapis lazuli Moonstone Onyx Opal Peridot Obsidian Quartz Ruby Sapphire Sodalite Sunstone Tanzanite Tiger Eye Topaz Tourmaline
Organic Gems
Amber Copal Coral Jet Pearl Abalone
General
Carat (unit) Carat (Purity) Finding fineness
Related topics: Piercing Fashion Gemology Metalworking wearable art
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Glass science topics
Basics
Glass Definition is glass a liquid or solid? Glass-liquid transition Glass Physics hypothermia
Glass formulation
AgInSbTe Borophosphosilicate borosilicate glass Bioglass Ceramic glaze chalcogenide glass crown glass Cobalt glass Cranberry glass of white quartz fluorosilicate GeSbTe Gold ruby glass Lead glass Milk glass bowl phosphosilicate glass Photochromic lens glass Silicate glass Soda-lime glass sodium water glass ultra low expansion glass Uranium glass Vitreous enamel ZBLAN
Glass-ceramic
Bioactive glass corningware glass-ceramic-metal seals Macor Zerodur
Glass Processing
Annealing Chemical vapor deposition amount of glass calculation Glass forming Glass melting technology glass modeling ion implantation Liquidus Sol-gel technique Viscosity
Optics
Dispersion graded index optics Hydrogen darkening Optical amplifier fiber Optical lens design Photochromic Lens Light Sensitive Transparent glass refraction materials
Surface modification
Anti-reflective coating Chemically glass corrosion decarbonization DNA microarray Hydrogen darkening glazing Porous glass self-cleaning glass Sol-gel glass technology
Diverse topics
Diffusion Glass-reinforced glass databases Glass electrode made of glass fiber reinforced concrete Glass history Glass ionomer cement Glass microspheres Glass-reinforced plastic glass institutes scientific glass-metal seal Porous Glass Prince Rupert's Drops Radioactive waste Glass windshield
Categories: Ceramics | Crafts | Coatings | Art Materials | Jewellery Making | Glass applications | Glass compositions | Art Glass | Ceramic Arts About the Author

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