crucible

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crucible,

vessel in which a substance is heated to a high temperature, as for fusing or calcining. The necessary properties of a crucible are that it maintain its mechanical strength and rigidity at high temperatures and that it not react in an undesirable way with its contents. Porcelainporcelain
[Ital. porcellana], white, hard, permanent, nonporous pottery having translucence which is resonant when struck. Porcelain was first made by the Chinese to withstand the great heat generated in certain parts of their kilns.
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, iron, and platinum are used in the lab; graphitegraphite
, an allotropic form of carbon, known also as plumbago and black lead. It is dark gray or black, crystalline (often in the form of slippery scales), greasy, and soft, with a metallic luster.
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 is usually used in industry, but firebrickfirebrick,
brick that can withstand high temperatures, used to line flues, stacks, furnaces, and fireplaces. In general, such bricks have high melting points that range from about 2,800°F; (1.540°C;) for fireclay to 4,000°F; (2,200°C;) for silicon carbide.
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 is also used, especially when vessels of large capacity are needed. The chamber at the bottom of a metal-refining furnace, where the molten metal collects to be drawn off, is known as a crucible.

Crucible

 

a vessel for melting, founding, or heating various materials. Crucibles are used, for example, for melting metals and alloys, for heat-treating metal objects in a controlled atmosphere or in liquid media (seeTANK FURNACE), for glassmaking, and for melting and calcining substances in the laboratory (seeLABORATORY VESSELS, CHEMICAL). Depending on the temperature of treatment and the chemical properties of the materials being treated, a crucible may be made of metal (pig iron, heat-resistant steels and alloys, or platinum), graphite, porcelain, or refractories. Crucibles are usually round in cross section and narrower at the bottom. In many industrial furnaces, materials are treated in crucibles inside the furnace itself.

crucible

[′krü·sə·bəl]
(science and technology)
A refractory vessel or pot, varying in size from a small laboratory utensil to large industrial equipment for melting or calcining.

crucible

1. a vessel in which substances are heated to high temperatures
2. the hearth at the bottom of a metallurgical furnace in which the metal collects
References in periodicals archive ?
GT's acquisition of this key crucible coating technology significantly strengthens its exclusive agreement with Vesuvius of Belgium for the supply of Zyarock(R) fused silica solar crucibles used in GT's DSS furnaces.
GT has identified Vesuvius as the exclusive certified supplier of Zyarock(R) fused silica solar crucibles used in GT systems.
However, erosion of crucible side walls was often taking the crucibles out of sendee, sometimes after as few as 25 days.
Through indirect heating methods and optimized design, MorganMMS crucibles offer foundries the advantages of low metal loss, minimal casting rejects, tight control of alloy composition, accurate temperature control and ease of alloy changeover.
The working life of a crucible in the metalcasting facility is primarily determined by melting equipment, installation and melting procedure, so the individual plant can often extend the life of crucibles by improving care and eliminating the factors that cause premature failure.
Aluminum ingots and returns are preheated in the tower and melted in a crucible.
MorganMMS' crucibles, foundry products, furnaces, service and technical advice are available worldwide through a network of group companies, agents and distributors.
The exhaust system also can be customized for use with hand-operated crucible cranes and monorails.
now manufactures its Non-Crucible furnace, which was designed for both continuous and batch melting aluminum operations as a durable, refractory-lined furnace that does not use crucibles.
Starck's innovative niobium sheet material makes it easy to deep draw and shape crucibles in the production of synthetic diamonds.