Method for manufacturing vitreous silica crucible
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United States of America Patent
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Nov 10, 2015
Grant Date -
Sep 25, 2014
app pub date -
Jun 5, 2014
filing date -
Dec 31, 2010
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Abstract
Accurate temperature measurement during manufacturing a vitreous silica crucible is enabled. The present invention provides an apparatus for manufacturing a vitreous silica crucible including: a mold for forming a silica powder layer by supplying silica powder therein; an are discharge unit having carbon electrodes and a power supply unit and for heating and fusing the silica powder layer by arc discharge; and a temperature measurement unit for measuring temperature of a fused portion in the mold, wherein the temperature measurement unit is an radiation thermometer for measuring temperature by detecting radiation energy of a wavelength of 4.8 to 5.2 μm.
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