Glass, glass-ceramic and ceramic articles with graded protective coatings having hardness and strength
US11591258B2 · kind B2 · utility
1Cited by
7References
19Claims
0Family size
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Key dates
| Filing date | Sep 27, 2018 |
| Grant date | Feb 28, 2023 |
| Priority date | — |
| Expiry date | Apr 13, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2218/155
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An article that includes: a substrate having a glass, glass-ceramic or a ceramic composition and comprising a primary surface; and a protective film disposed on the primary surface. The protective film comprises a thickness of greater than 1.5 microns and a maximum hardness of greater than 15 GPa at a depth of 500 nanometers, as measured on the film disposed on the substrate. Further, the protective film comprises a metal oxynitride that is graded such that an oxygen concentration in the film varies by 1.3 or more atomic %. In addition, the substrate comprises an elastic modulus less than an elastic modulus of the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.