Cylindrical vessel made of carbon and process for making silicon
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United States of America Patent
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Oct 9, 2012
Grant Date -
Jan 31, 2008
app pub date -
Jun 22, 2005
filing date -
Jun 22, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cylindrical vessel made of carbon is used in the production of silicon. The inner surface of the vessel comes into contact with a silicon melt, wherein the permeation with silicon melt is reduced, formation of SiC is suppressed, and the vessel is resistant to deformation even when volumetric expansion ascribable to silicon is brought about. The carbon-made cylindrical vessel is made of a carbon material having a bulk specific gravity of 1.8 or more. The thermal expansion coefficient of the carbon material at 350 to 450° C. is preferably 3.5×10−6/° C. to 6.0×10−6/° C. A process for producing silicon uses said vessel wherein a chlorosilane is reacted with hydrogen.
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