Method of manufacturing vitreous silica crucible
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United States of America Patent
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Jul 21, 2015
Grant Date -
Jul 5, 2012
app pub date -
Dec 27, 2011
filing date -
Dec 31, 2010
priority date (Note) -
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Abstract
There is provided a method of manufacturing a vitreous silica crucible having a suitably controlled inner surface property. The present invention provides a method of manufacturing a vitreous silica crucible by heating and fusing a silica powder layer in a rotating mold by arc discharge generated by carbon electrodes including: a preparation process for determining optimal fusing temperatures during heating and fusing the silica powder layer at plural points of different heights of the silica powder layer; a temperature measuring process for measuring actual temperatures during heating and fusing the silica powder layer at the plural points; a temperature controlling process for controlling the actual temperatures at the plural points so that the actual temperatures matches the optimal fusing temperatures at the respective points.
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