PISTON RING AND ITS PRODUCTION METHOD |
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| 申请号 | US15744609 | 申请日 | 2016-07-14 | 公开(公告)号 | US20180209541A1 | 公开(公告)日 | 2018-07-26 |
| 申请人 | KABUSHIKI KAISHA RIKEN; | 发明人 | Yuji SHIMA; | ||||
| 摘要 | To provide a piston ring free from microwelding to a piston while exhibiting excellent wear resistance in side surfaces, for a long period of use in a high-temperature, high-pressure environment, and its production method, a nitride layer is formed on at least one of upper and lower side surfaces of the piston ring, and then subjected to a phosphate chemical conversion treatment, such that the nitride layer has at least one of granular and vermicular surface forms. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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