| 摘要 |
A piston ring having a first coating of nodular thin dense chromium is disclosed. The first coating is preferably provided on upper and lower radially extending surfaces of the piston ring. Further, the first coating is provided on a radially inner vertical surface of the piston ring. A radially outer vertical surface of the piston ring preferably includes a second coating of a thermal spray. The first coating provides improved wear resistance and a smooth surface for piston rings received in piston grooves.
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