Piston ring with oxide-nitride composite layer
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United States of America Patent
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Apr 27, 2004
Grant Date -
Dec 5, 2002
app pub date -
Jun 3, 2002
filing date -
Jun 1, 2001
priority date (Note) -
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Abstract
A piston ring for use in a cylinder of an internal combustion engine, which ring is nitride-hardened at least on the sliding surface between piston ring and cylinder wall. The nitride layer is composed of a precipitated layer and a compound layer, wherein the piston ring consists of a low-alloyed iron-base material and an oxide layer is deposited on the compound layer.
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