| 摘要 |
The purpose of the present invention is to provide: a piston ring with which aluminum adhesion can be prevented over long periods even when used in a high temperature, high pressure environment and which exhibits excellent side surface abrasion resistance; and a manufacturing method therefor. By forming a nitride layer on the upper and/or lower side surface of the piston ring and then applying a phosphate chemical conversion treatment, the nitride layer is made to comprise granular and/or worm-shaped surface forms. |
