Piston ring for internal combustion engines
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United States of America
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Oct 8, 2019
Grant Date -
Oct 20, 2016
app pub date -
Apr 17, 2016
filing date -
Apr 17, 2016
priority date (Note) -
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Abstract
A piston ring for an internal combustion engine may include a substantially annular base of a ferrous alloy upon which is applied a coating. The coating may have a first bonding layer and at least a first external layer or a second external layer deposited upon the first bonding layer up to a maximum of 100 micrometers in thickness of a plurality of sequentially deposited first and second external layers. The first external layer may include a nitride of a doped metal chemical element, a doping element being aluminum. The second external layer may include a nitride of the metal chemical element. The first external layer may have a thickness greater than at least once a thickness of the second external layer and less than ten times the thickness of the second external layer.
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