Patent ID: 11905203
Assignee: CORNING INCORPORATED
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC B  C

Claim 0:
1. An article, comprising:
a substrate comprising a glass, glass-ceramic or ceramic composition and comprising a primary surface; and
a protective film disposed on the primary surface of the substrate,
wherein the protective film has a maximum hardness of greater than 12 GPa at a depth of 500 nanometers, as measured on the protective film disposed on the substrate,
wherein the protective film comprises a crack onset strain (COS) failure level of 0.5% or greater,
wherein the protective film comprises a metal oxynitride comprising a graded region that is graded such that an oxygen concentration in the film varies by 1.3 or more atomic %,
wherein the protective film further comprises a non-graded region, wherein the graded region is bounded by the primary surface of the substrate and the non-graded region,
wherein the oxygen concentration in the graded region decreases from the primary surface of the substrate to the non-graded region,
further wherein the substrate comprises an elastic modulus less than an elastic modulus of the protective film.