Quartz glass crucible and method for the production thereof

Details Quartz glass crucible and method for the production thereof Quartz glass crucible and method for the production thereof

2007-06-05

2007-06-05

Hiteshew, Felisa (Department: 1722)

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth from liquid or supercritical state

Having pulling during growth

C065S032200, C065S033400, C065S033600

Reexamination Certificate

active

10512114

ABSTRACT:
A known quartz glass crucible for crystal pulling consists of a crucible wall, having an outer layer which is provided in an external area thereof with a crystallisation promoter which results in crystallisation of quartz glass, forming cristobalite when the quartz glass crucible is heated according to specified use in crystal pulling. The aim of the invention is to provide a quartz glass crucible which has a long service life. As a result, the crystallisation promoter contains, in addition to a silicon, a first component which acts as a reticulating agent in quartz glass and a second component which is free of alkali metals and which acts as an agent forming separating points in quartz glass. The above mentioned components are contained and incorporated into a doping area (8) of the outer layer (6) having a layer thickness of more than 0.2 mm.

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patent: 6548131 (2003-04-01), Fabian et al.
patent: 6755049 (2004-06-01), Korus et al.
patent: 0 748 885 (1996-12-01), None
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patent: WO 00/46432 (2000-08-01), None
patent: WO 02/16677 (2002-02-01), None

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