Lance for use during combustion
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United States of America Patent
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Issued Date -
Feb 22, 2007
app pub date -
Jan 5, 2006
filing date -
Aug 19, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A composite lance for use during the injection of gases during combustion, and a method for making such a lance. The lance has a channel through which gas flows, and it includes a core of a metallic material and a ceramic layer outside the core. The outer surface of the core includes a region having a smaller diameter bounded axially by regions each having larger diameters. The ceramic layer is positioned around the core with a gap between the outer surface of the core and the inner surface of the ceramic layer. The gap prevents the ceramic layer from cracking because of differences in thermal expansion between the core and the ceramic layer when temperature changes take place in the lance.
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