Piston ring with localized nitrided coating
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United States of America Patent
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Mar 24, 2015
Grant Date -
Jul 17, 2014
app pub date -
Jan 15, 2013
filing date -
Jan 15, 2013
priority date (Note) -
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Abstract
A piston ring comprising upper face, a lower face, an inner perimeter wall, and an outer perimeter wall that extends around the piston ring from the upper face to the lower face, where the outer perimeter wall has upper corner region disposed adjacent the upper face, a lower corner region disposed adjacent the lower face, and a band of a nitrided conversion layer extending between the upper corner region and the lower corner region, and where a PVD nitride layer is disposed on the upper corner region and on the lower corner region.
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