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US 10,843,439 B2Granted
Damage-resistant glass articles and method
AssigneeCorning Incorporated
InventorsSuresh Thakordas Gulati, Balram Suman
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Abstract
A strengthened glass article has opposing first and second compressively stressed surface portions bound to a tensilely stressed core portion, with the first surface portion having a higher level of compressive surface stress than the second surface portion for improved resistance to surface damage, the compressively stressed surface portions being provided by lamination, ion-exchange, thermal tempering, or combinations thereof to control the stress profiles and limit the fracture energies of the articles.
Claims13
A glass article comprising:
- a glass core layer;
- first and second glass surface layers fused to the glass core layer to form a laminated article, each of the first and second glass surface layers having a lower thermal expansion than the glass core layer;
- and
- an asymmetric stress profile resulting at least partially from subjecting the laminated article to an ion-exchange treatment at outer surfaces of the laminated article;
- and
- a bending moment M as defined by the expression M=(1+ρ)(D1+D2+D3)/ρ of substantially zero, wherein D1, D2 and D3 correspond, respectively, to bending rigidities of the first glass surface layer, the glass core layer, and the second glass surface layer, and wherein ρ represents a common radius of curvature of the glass article.
3 more elements
Dependencies are inferred from the claim text.