crucible


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Related to crucible: crucible steel

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 ?
And Williams, a Crucible winner in 2000 and 2003, said he hoped snooker's biggest tournament would head to China.
The Welshman showed glimpses of the form which saw him defeat defending champion John Higgins in the previous round, but his first quarter-final appearance at the Crucible was a largely frustrating affair.
Another interesting direction, in which induction heating is used without contact of molten metal with refractory materials, is melting in a cold crucible [4-7], which differs from conventional crucible induction melting by conditions of energy transfer from the inductor to a melt, because between the inductor and the metal melt a wall of the cold crucible is located, which distorts electromagnetic field created by current in the inductor.
Scottish Crucible is designed and directed by Ruth Neiland, Head of Academic Leadership and Development at Heriot-Watt, and is run through that Department.
But the considerable skills of Crucible members proved to be highly adaptable, to say the least.
Martin, meanwhile, paid the shipping costs and bought a crucible and safety equipment for the project, which is expected to get started next year.
Each year, The Crucible distributes more than $120,000 in scholarships and free programming to Bay Area youth and public schools, reserving up to 20% of class slots for need-based scholarship students.
Another said: "Probably easier to win three qualifying rounds to get to the Crucible than attempting to buy tickets.
But World Snooker chairman Hearn said: "The Crucible is where we come from, there's the history, that's where the deal's for.
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.
But 1997 Crucible King Doherty believes money can't buy the unique atmosphere.