Method of manufacturing vitreous silica crucible
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United States of America Patent
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Apr 8, 2014
Grant Date -
Jul 5, 2012
app pub date -
Dec 27, 2011
filing date -
Dec 31, 2010
priority date (Note) -
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Abstract
The present invention provides a method of manufacturing a vitreous silica crucible including: a silica powder supplying process of supplying a material silica powder into a mold for molding a vitreous silica crucible, to form a silica powder layer, and an arc fusing process of arc fusing the silica powder layer by arc discharge generated by carbon electrodes, wherein the arc fusing process includes processes of measuring temperatures at measuring points provided on different heights of an inner surface of the silica powder layer while rotating the mold, and controlling the arc discharge to enable detection, at each measuring point, of a local maximum point which appears first in the arc fusing process.
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