Title:
石英ガラスルツボ
Document Type and Number:
Japanese Patent JP6973554
Kind Code:
B2
Abstract:
In an exemplary embodiment, a quartz glass crucible 1 includes: a high-aluminum-content layer 14B which is made of quartz glass having a relatively high average aluminum concentration and is provided to form an outer surface 10b of the quartz glass crucible 1; and a low-aluminum-content layer 14A which is made of quartz glass having a lower average aluminum concentration than that of the high-aluminum-content layer 14B and is provided on an inner side of the high-aluminum-content layer 14B, wherein the low-aluminum-content layer 14A includes an opaque layer 11 made of quartz glass containing a large number of minute bubbles, and the high-aluminum-content layer 14B is made of transparent or translucent quartz glass having a lower bubble content than that of the opaque layer 11. The quartz glass crucible is capable of withstanding a single crystal pull-up step undertaken for a very long period of time.
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Inventors:
Hiroshi Kishi
Masanori Fukui
Masanori Fukui
Application Number:
JP2020071405A
Publication Date:
December 01, 2021
Filing Date:
April 13, 2020
Export Citation:
Assignee:
Sumco inc.
International Classes:
C30B29/06; C03B20/00; C30B15/10
Domestic Patent References:
| JP2000247778A | ||||
| JP2013035727A | ||||
| JP2011088775A | ||||
| JP2010275151A | ||||
| JP2012072038A | ||||
| JP2011032147A | ||||
| JP2006124235A | ||||
| JP2001348294A |
Attorney, Agent or Firm:
Mitsuhiro Washito
Ogata Japanese
Ogata Japanese