Process and device for producing a quartz glass crucible by ring-like arc, and its quartz glass crucible
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United States of America Patent
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Feb 8, 2005
Grant Date -
Nov 13, 2003
app pub date -
Mar 10, 2003
filing date -
Mar 14, 2002
priority date (Note) -
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Abstract
The present invention provides a process and a device for producing a quartz glass crucible, which generates a stable ring-like arc and is suitable for the production of an excellent crucible having the large open diameter. In a production process and a device for producing a quartz glass crucible, wherein a quartz powder in a mould is heated to be fused by an arc discharge of the electrodes being positioned at around of a rotational axis of a mould, this invention is characterized by using an electrode structure, in which electrodes neighboring each other are positioned at regular intervals in the ring configuration, to form the stable ring-like arc being generated between the electrodes neighboring each other without generating an continuous arc between electrodes facing each other across a central portion of the ring, and heating and fusing a quarts powder.
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