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A modern crucible used in the production of silicon ingots via the Czochralski process Smaller clay graphite crucibles for copper alloy melting. A crucible is a container in which metals or other substances may be melted or subjected to very high temperatures. Although crucibles have historically tended to be made out of clay, [1] they can be ...
Crucible steel is steel made by melting pig iron, cast iron, iron, and sometimes steel, often along with sand, glass, ashes, and other fluxes, in a crucible. Crucible steel was first developed in the middle of the 1st millennium BCE in Southern India and Sri Lanka using the wootz process. [1] [2] [3] [4]
When silicon is grown by the Czochralski method, the melt is contained in a silica crucible. During growth, the walls of the crucible dissolve into the melt and Czochralski silicon therefore contains oxygen at a typical concentration of 10 18 cm −3. Oxygen impurities can have beneficial or detrimental effects.
The use of graphite as a refractory (heat-resistant) material began before 1900 with graphite crucibles used to hold molten metal; this is now a minor part of refractories. In the mid-1980s, the carbon-magnesite brick became important, and a bit later the alumina-graphite shape.
During this time, processing of clay and graphite was the most important economic factor. In 1516 the Obernzeller graphit melting had their own guilds. Around 1530 was the first time Hafner cell named after the potters resident. The crucible prepared consisted of 50% graphite, 40% clay and 10% quartz.
This cylinder, referred to as an electrode is then put into a large cylindrical enclosed crucible and brought to a metallurgical vacuum (0.001–0.1 mmHg or 0.1–13.3 Pa). At the bottom of the crucible is a small amount of the alloy to be remelted, which the top electrode is brought close to prior to starting the melt.
At the time of Dixon's death in 1869, the Joseph Dixon Crucible Company was the largest manufacturer of graphite products in the world. By 1870, The Joseph Dixon Crucible Company was the world's largest dealer and consumer of graphite. By 1872 the Dixon company was making 86,000 pencils a day.
Graphite is the most stable allotrope of carbon. Contrary to popular belief, high-purity graphite does not readily burn, even at elevated temperatures. [8] For this reason, it is used in nuclear reactors and for high-temperature crucibles for melting metals. [9]
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