FIELD: engines and pumps.
SUBSTANCE: invention relates to ICE sliding element, particularly, to piston ring. Proposed sliding element has coating that represents ta-C-type diamond-like coat with internal strains varying over its depth, hence, with at least one internal strain gradient. Coating area (IV) facing the base material bulges inward with negative gradient of internal strain and outside coating area (II) features positive gradient of internal strain while mid area (III) features alternating areas of high and low internal strain.
EFFECT: longer life without loss of preset friction properties.
8 cl, 2 dwg
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