Seal system
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United States of America Patent
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Nov 4, 2008
Grant Date -
Sep 23, 2004
app pub date -
Mar 15, 2004
filing date -
Mar 21, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
It is disclosed a method of deposting a seal coating and a seal system comprising at least two layers on the surface of an article. The upper or surface layer has a higher chromium activity than a bottom layer to reduce a diffusion of cobalt and the formation of cobalt oxide is reduced. The coating of invention may be heat-treated to reduce or optimize the formation of cobalt oxide to sustin the wear property.
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