Invention Grant
- Patent Title: Vitreous silica crucible with specific ratio of transparent layer and bubble-containing layer thicknesses
- Patent Title (中): 玻璃硅石坩埚具有特定比例的透明层和含气泡层厚度
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Application No.: US13308250Application Date: 2011-11-30
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Publication No.: US09347148B2Publication Date: 2016-05-24
- Inventor: Toshiaki Sudo , Ken Kitahara , Koichi Suzuki , Shinsuke Yamazaki
- Applicant: Toshiaki Sudo , Ken Kitahara , Koichi Suzuki , Shinsuke Yamazaki
- Applicant Address: JP Tokyo
- Assignee: SUMCO CORPORATION
- Current Assignee: SUMCO CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Law Office of Katsuhiro Arai
- Priority: JP2010-268841 20101201
- Main IPC: C30B15/10
- IPC: C30B15/10

Abstract:
Provided is a vitreous silica crucible, which is resistant to deformation and corrosion even when heated at high temperature for a long time. There is provided a vitreous silica crucible of the present invention including a substantially cylindrical straight body portion, a curved bottom portion, and a corner portion smoothly connecting the straight body portion and the bottom portion, wherein a wall of the vitreous silica crucible includes, from an inner surface side, a transparent layer and a bubble-containing layer, and a ratio of a thickness of the bubble-containing layer with respect to a thickness of the transparent layer at an intermediate position between an upper end and a lower end of the straight body portion is 0.7 to 1.4.
Public/Granted literature
- US20120137963A1 VITREOUS SILICA CRUCIBLE Public/Granted day:2012-06-07
Information query
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