Hard coating material, sliding member coated with hard coating material and method for manufacturing sliding member
AssigneesTeikoku Piston Ring Co., Ltd., Kabushiki Kaisha Kobe Seiko Sho
InventorsSatomichi Miyazaki, Nobuyuki Yamashita, Shoji Tanaka, Hiroto Fukutome, Hiroshi Tamagaki
Life of this patent
Estimating the term…
Abstract
A hard film 2 is applied to cover an outer circumferential surface of a piston ring 1 by an ion plating process. Either 3 percent to 20 percent by weight of oxygen, or 2 percent to 11 percent by weight of carbon is included in a solid solution state in a crystal structure of CrN in the hard film 2. The Vickers hardness of the hard film 2 is in a range of 1600 to 2200.
Claims5
A hard coating material for a sliding member made of steel, cast iron, titanium or titanium alloy in which either 3 percent to 20 percent by weight of oxygen, or 2 percent to 11 percent by weight of carbon is included in a solid solution state in a crystal structure of CrN and the Vickers hardness of the hard coating material is in a range of 1600 to 2200.
Dependencies are inferred from the claim text.