PISTON RING |
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| 申请号 | US15739347 | 申请日 | 2016-07-29 | 公开(公告)号 | US20180180182A1 | 公开(公告)日 | 2018-06-28 |
| 申请人 | NIPPON PISTON RING CO., LTD.; | 发明人 | Takuya OZAKI; Hiroyuki SUGIURA; | ||||
| 摘要 | To provide a piston ring comprising a hard carbon film that is easy to form and exhibits excellent wear resistance. The above-described problem is solved by having a hard carbon film 4 formed on at least an outer peripheral sliding surface 11 of a piston ring base material 1, wherein the hard carbon film 4 is a laminated film comprising a plurality of layers, and is configured so as to contain boron within a range of an atomic density of 0.2×1022 atoms/cm3 to 2.0×1022 atoms/cm3 inclusive. This hard carbon film 4 may be configured to have an sp2 component ratio within a range of 40% to 80% inclusive, measured in a TEM-EELS spectrum formed by combining electron energy loss spectroscopy (EELS) with a transmission electron microscope (TEM), and a hydrogen content within a range of 0.1 atom % to 5 atom % inclusive. Further, a total thickness of this hard carbon film 4 may be configured to be within a range of 0.5 μm to 20 μm inclusive. | ||||||
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