Part coated with a non-hydrogenated amorphous carbon coating on an undercoat comprising chromium, carbon and silicon
US11732343B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Jun 17, 2019 |
| Grant date | Aug 22, 2023 |
| Priority date | — |
| Expiry date | Apr 1, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C28/048
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a part comprising a metal substrate, a non-hydrogenated amorphous ta-C or aC carbon coating that coats the substrate, and an undercoat which is based on chromium (Cr), carbon (C) and silicon (Si) and is disposed between the metal substrate and the amorphous carbon coating and to which the amorphous carbon coating is applied, characterized in that the undercoat included, at its interface with the amorphous carbon coating, a ratio of silicon in atomic percent to chromium in atomic percent (Si/Cr) of 0.3 to 0.60, and a ratio of carbon in atomic percent to silicon in atomic percent (C/Si) of 2.5 to 3.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.