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公开(公告)号:US20230083774A1
公开(公告)日:2023-03-16
申请号:US17793654
申请日:2021-01-21
发明人: Hiroki SAITO , Keiji HONDA , Yuji SHIMA
摘要: A piston ring includes a substrate, and a film covering at least a part of a surface of the substrate. The film includes Si and N. A Si content of the film is in a range of 1.1 to 7.5 at %, a crystallite size of the film is in a range of 10 to 30 nm, and a compressive residual stress of the film is 400 to 800 MPa.