CRUCIBLE HAVING A POLYGONAL OPENING
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United States of America Patent
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Issued Date -
May 23, 2013
app pub date -
Jul 12, 2011
filing date -
Jul 27, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The invention relates to an arc melted silica crucible having a polygonal opening, in particular square or rectangular, and its method of fabrication, which comprises preforming the silica powder in a hollow mold having a polygonal opening, said mold being provided with a multiplicity of channels passing through its bottom and its walls, said channels being distributed over its whole internal surface, to constitute a preform, then melting the silica by an electric arc inside the preform, sucking the gases through the mold and the preform, generating a gas speed of at least 0.15 m/second at every point of the inner surface of the preform at the onset of the melting.
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