PISTON RING
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United States of America Patent
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Issued Date -
May 24, 2012
app pub date -
Jun 29, 2010
filing date -
Jul 1, 2009
priority date (Note) -
Abandoned
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Abstract
There is described a piston ring, particularly devised for use in internal combustion engines or compressors, comprising at least a metallic base (2) to which there is applied, by the process of physical vapor deposition (PVD), a coating (3) of chromium nitride that comprises a periodicity (P), formed by at least two adjacent layers (5,5′), each layer (5,5′) having a predominantly chromium nitride phase different from the adjacent layer.
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