发明名称 |
METHOD FOR MANUFACTURING QUARTZ GLASS CRUCIBLE |
摘要 |
The method of producing a vitreous silica crucible, comprises deposition step of depositing silica powder on an inner wall surface of a cylindrical rotation mold having a bottom while rotating the mold; and a fusion step to obtain a vitreous silica crucible by heating and fusing the silica powder deposited on the inner wall surface of the mold and thereby vitrifying the silica powder. In the deposition step, a density of the deposited silica powder layer on the inner wall surface of the mold is controlled within a predetermined range by controlling the electrostatic charging voltage of the silica powder to be in a range of 1.0kV or less in absolute value, and supplying the thus controlled silica powder to the inner wall surface of the mold. Thus, a wall thickness of the vitreous silica crucible is controlled. |
申请公布号 |
EP2174917(A4) |
申请公布日期 |
2012.08.15 |
申请号 |
EP20080791687 |
申请日期 |
2008.07.25 |
申请人 |
JAPAN SUPER QUARTZ CORPORATION |
发明人 |
FUJITA, TAKESHI;KANDA, MINORU |
分类号 |
C03B20/00;C03B19/09;C30B15/10;C30B29/06 |
主分类号 |
C03B20/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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