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Title:
QUARTZ GLASS CRUCIBLE, METHOD FOR PRODUCING SILICON SINGLE CRYSTAL USING SAME, METHOD FOR MEASURING INFRARED TRANSMITTANCE OF QUARTZ GLASS CRUCIBLE, AND METHOD FOR MANUFACTURING QUARTZ GLASS CRUCIBLE
Document Type and Number:
WIPO Patent Application WO/2020/137648
Kind Code:
A1
Abstract:
[Problem] To provide a quartz glass crucible capable of increasing the production yield of a silicon single crystal having a low oxygen concentration. [Solution] The present invention provides a quartz glass crucible 1 having: cylindrical side wall portions 10a; a bottom portion 10b; and corner portions 10c interconnecting the side wall portions 10a and the bottom portion 10b, wherein the quartz glass crucible 1 is provided with: a transparent layer 11 made of a quartz glass which does not contain a bubble; a bubble layer 12 formed on the outside of the transparent layer 11 and made of a quartz glass containing a large number of bubbles; and a semi-molten layer 13 which is formed on the outside of the bubble layer 12 and in which raw silica powder is solidified in a semi-molten state. The infrared transmittance of the corner portions 10c is 25-51% in a state in which the semi-molten layer 13 is excluded, the infrared transmittance of the corner portions 10c is lower than the infrared transmittance of the side wall portions 10a in a state in which the semi-molten layer 13 is excluded, and the infrared transmittance of the side wall portions 10a is lower than the infrared transmittance of the bottom portion 10b in a state in which the semi-molten layer 13 is excluded.

Inventors:
KITAHARA KEN (JP)
FUKUI MASANORI (JP)
KISHI HIROSHI (JP)
KATANO TOMOKAZU (JP)
KITAHARA ERIKO (JP)
Application Number:
PCT/JP2019/049120
Publication Date:
July 02, 2020
Filing Date:
December 16, 2019
Export Citation:
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Assignee:
SUMCO CORP (JP)
International Classes:
C30B29/06; C03B20/00; C30B15/10; F27B14/10
Foreign References:
JP2016193809A2016-11-17
JP2004107163A2004-04-08
JP2018039702A2018-03-15
JP2010105880A2010-05-13
JP2018043903A2018-03-22
Attorney, Agent or Firm:
WASHIZU Mitsuhiro et al. (JP)
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