Invention Grant
- Patent Title: Silica glass crucible
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Application No.: US16955009Application Date: 2018-11-02
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Publication No.: US11535546B2Publication Date: 2022-12-27
- Inventor: Ken Kitahara , Masaru Sato , Takuma Yoshioka
- 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: JPJP2018-035666 20180228
- International Application: PCT/JP2018/040896 WO 20181102
- International Announcement: WO2019/167345 WO 20190906
- Main IPC: C30B15/10
- IPC: C30B15/10 ; C03B20/00 ; C03C19/00 ; C30B29/06

Abstract:
A silica glass crucible includes a cylindrical side wall portion, a curved bottom portion, and a corner portion that is provided between the side wall portion and the bottom portion and has a higher curvature than a curvature of the bottom portion, in which a first region provided from a crucible inner surface to a middle in a thickness direction, a second region that is provided outside the first region in the thickness direction and has a different strain distribution from the first region, and a third region that is provided outside the second region in the thickness direction and up to the crucible outer surface and has a different strain distribution from the second region, are provided, and internal residual stresses of the first region and the third region are compressive stresses, whereas an internal residual stress of the second region includes a tensile stress.
Information query
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