Method for Producing a Coat on a Piston Ring and Piston Ring
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United States of America Patent
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Issued Date -
Apr 24, 2008
app pub date -
Jun 21, 2005
filing date -
Jul 3, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a method for producing a coat on the outer peripheral surface of a piston ring base. According to said method, a plurality of layers is applied layer by layer to the peripheral surface by applying, using a PVD method, at least one metal adhesive layer based on Cr to the peripheral surface without adding nitrogen to the process gas. Nitrogen is added to the process gas while increasing the partial pressure of the nitrogen, thereby forming a CrN gradient layer on the adhesive layer, and finally at least one cover layer having a constant composition based on CrN, Cr.sub.2N or a mixture of the two phases is applied to said gradient layer.
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