Hard film, sliding member covered with hard film, and manufacturing method thereof
Patent 6372369 Issued on April 16, 2002. Estimated Expiration Date: 
September 13, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 13, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesNonferrous piston ring with hard surface treatment layer Hard coating material, sliding member coated with hard coating material and method for manufacturing sliding member Sliding contact-making structures in internal combustion engine Piston ring Hard coating material, sliding member covered with hard coating material and manufacturing method thereof Patent #: 6060182 InventorsAssigneeApplicationNo. 661410 filed on 09/13/2000US Classes:428/698, Carbide-, nitride-, or sulfide-containing layer106/286.1, Inorganic materials only containing at least one metal atom427/523, Ion plating or implantation428/3361 mil or lessExaminersPrimary: Turner, ArcheneAttorney, Agent or FirmInternational ClassesF16J 009/26C23C 026/00 Foreign Application Priority Data1999-09-24 JPAbstractA nitrided layer is formed on a piston ring and a hard film is formed by arc ion plating on the nitrided layer at the outer circumferential surface. The hard film has a crystal structure comprised of mixed phases of CrN and TiN, and contains oxygen in a solid solution state in the CrN and TiN crystals. The hard film comprises chromium of 40 to 75 percent by weight, titanium of 10 to 40 percent by weight, oxygen of 0.5 to 15 percent by weight, and the remainder of nitrogen. The crystal particle size is within 1 μm. The Vickers hardness of the hard film is in a range of 1300 to 2300. The crystals of CrN and TiN have a preferred orientation of (200) surface or preferred orientation of (111) surface parallel to a surface being covered, and has a columnar structure developing in a columnar shape from the base material toward the film surface. Carbon in a solid solution state may be contained instead of oxygen, and both oxygen and carbon may be contained in a solid solution state. An under film of CrN may be formed between the nitrided layer and the hard film.Other References
| |
