Multilayer structured quartz glass crucible and method for...

Details Multilayer structured quartz glass crucible and method for... Multilayer structured quartz glass crucible and method for...

2005-01-11

2005-01-11

Pyon, Harold (Department: 1772)

Stock material or miscellaneous articles

Hollow or container type article

Glass, ceramic, or sintered, fused, fired, or calcined metal...

C428S034600, C428S428000, C428S426000, C428S034100, C117S200000, C117S204000, C117S206000, C432S262000, C432S263000, C432S264000, C432S265000, C432S156000, C432S157000, C432S158000, C422S245100, C422S908000

Reexamination Certificate

active

06841210

ABSTRACT:
Disclosed is a multilayer structured quartz glass crucible, for pulling up silicon single crystal, whose structure has at least three layers comprising: a translucent outer layer made of naturally occurring quartz glass and having a large number of pores, a translucent intermediate layer, made of synthetic quartz glass and having a large number of pores, and a transparent inner layer substantially free from pores and made of a synthetic quartz glass. Thermal convection within the silicon melt is suppressed by use of the quartz glass crucible, thereby preventing oscillation on the surface of the silicon melt. A method for producing the quartz glas crucible is also disclosed.

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