Glass, glass-ceramic and ceramic articles with protective coatings having hardness and toughness
US11072558B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Nov 21, 2019 |
| Grant date | Jul 27, 2021 |
| Priority date | — |
| Expiry date | Nov 21, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An article includes: a transparent substrate having a primary surface; and a protective film disposed on the primary surface, such that each of the substrate and the protective film have an optical transmittance of 20% or more in the visible spectrum, and such that the protective film includes at least one of: (1) a hardness of greater than 13 GPa, as measured by a Berkovich nanoindenter, or (2) an effective fracture toughness (Kc) of greater than 2.5 MPa·m1/2, as measured by indentation fracture at a depth of greater than 1 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.