Piston ring having hard multi-layer coating
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United States of America Patent
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Oct 11, 2011
Grant Date -
Aug 28, 2008
app pub date -
Mar 1, 2006
filing date -
May 26, 2005
priority date (Note) -
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Abstract
A piston ring (22) is covered at least partially with a layered structure (30). The layered structure (30) comprises: --a first intermediate layer (32) comprising at least one element of group IVB, group VB or group VIB; --a second intermediate layer (34) deposited on top of the first intermediate layer (32) and comprising a diamond-like nanocomposite composition; --a diamond-like carbon layer (36) deposited on top of the second intermediate layer (34).
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