Invention Grant
- Patent Title: Method of manufacturing a vitreous silica crucible having a transparent layer, bubble-containing layers, and a semi-transparent layer in its wall
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Application No.: US14841564Application Date: 2015-08-31
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Publication No.: US09719188B2Publication Date: 2017-08-01
- Inventor: Toshiaki Sudo , Hiroshi Kishi , Eriko Suzuki
- Applicant: SUMCO CORPORATION
- Applicant Address: JP Tokyo
- Assignee: SUMCO CORPORATION
- Current Assignee: SUMCO CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Law Office of Katsuhiro Arai
- Priority: JP2010145565 20100625
- Main IPC: C30B15/10
- IPC: C30B15/10 ; C03B19/09 ; C30B29/06 ; C30B35/00

Abstract:
A method of manufacturing of a vitreous silica crucible includes: fusing silica powder under a reduced pressure of −50 kPa or more and less than −95 kPa to form a transparent vitreous silica layer as an inner layer; fusing silica powder under a reduced pressure of 0 kPa or more and less than −10 kPa to form a bubble-containing vitreous silica layer as an intermediate layer; and fusing silica powder under a reduced pressure of −10 kPa or more and less than −50 kPa to form a semi-transparent vitreous silica layer as an outer layer.
Public/Granted literature
- US20150368828A1 METHOD OF MANUFACTURING VITREOUS SILICA CRUCIBLE AND METHOD OF MANUFACTURING SILICON INGOT Public/Granted day:2015-12-24
Information query
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