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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.



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.


(science and technology)
A refractory vessel or pot, varying in size from a small laboratory utensil to large industrial equipment for melting or calcining.


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 ?
The high energy costs involved in metal casting are of significant concern to foundries, and so Morgan Advanced Materials commissioned an independent laboratory to compare the thermal conductivity of its Salamander SIC crucible with that of two competitor crucibles, from room temperature to 1600[degrees]C.
Ideally, crucibles should be moved on the pallet or in the shipping carton.
3+] in various chemical forms, and 2/ influence of crucibles on the microstructure and optical properties of the glasses.
In the conventional method, molten aluminium in extracted or tapped from the tops through a tapping pipe that is manually inserted into a crucible and then physically hammered into location," said reduction services superintendent Hussain Zayer.
It has now started a 90-day consultation with staff, but said that it expects that manufacture of crucibles and clay graphite products to stop in the first quarter of 2008.
These include "metal delivered ready to cast, no melt loss compared to melting of ingots, consistent quality, lower emissions in the foundry, the transportation crucible can be used as holding furnace via new heating system, no maintenance cost for foundry for holding furnace, very little space required, no ingot inventory and therefore less financing cost, no future investment in melting and holding furnaces necessary.
The ideal e-beam source should provide an impact of the beam onto the top surface of the crucible at a 90 [degrees] angle.
Recently, the recent R&D has focused on quartz crucibles without impurities, which hinder ingot growth, and many surface coating technologies to prevent oxygen contained in quartz from being leaked to the outside.
Haldenwanger HalCoat comprises two grades of SI3N4 coating which can be applied to a variety of Morgan products including fused silica, silicon carbide and mullite bonded ceramics to offer a host of benefits from enhancing durability to avoiding contamination within a crucible.
Also, preformed crucibles are backup lined with a dry material between the crucible and the coil refractory fining.
In case of induction melting in the cold crucible geometric parameters of the latter are close to those of the crucibles, made from refractory materials, used in conventional induction furnaces, i.
Morgan Crucible has workings in Stourport-on-Severn and Rugby as well as a crucibles business in Norton.