Damage-resistant glass articles and method
AssigneeCorning Incorporated
InventorsSuresh Thakordas Gulati, Balram Suman
Life of this patent
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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.
Claims16
A glass article having opposing first and second compressively stressed surface portions bound to a tensilely stressed core portion, the opposing first and second compressively stressed surface portions comprising first and second glass skin layers laminated to the tensilely stressed core portion to form a laminated article, the glass article having a stress profile resulting from subjecting the laminated article to an ion-exchange treatment,
- wherein the first surface portion has a higher level of surface compression than the second surface portion,
- wherein the opposing first and second compressively stressed surface portions are of differing composition and thickness, and
- wherein the glass article has 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 skin layer, the tensilely stressed core portion, and the second glass skin layer, and ρ represents a common radius of curvature of the glass article.
A glass article comprising:
- opposing first and second glass skin layers laminated to a glass core layer, each of the first and second glass skin layers comprising a lower thermal expansion than the glass core layer, and at least a portion of a stress profile of the glass article comprising an error function profile;
- 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 skin layer, the glass core layer, and the second glass skin layer, and wherein p represents a common radius of curvature of the glass article.
A glass article comprising;
- opposing first and second compressively stressed surface portions bound to a tensilely stressed core portion, the opposing first and second compressively stressed surface portions comprising first and second glass skin layers laminated to the tensilely stressed core portion to form a laminated article;
- a stress profile resulting from subjecting the laminated article to an ion-exchange treatment;
- 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 skin layer, the tensilely stressed core portion, and the second glass skin layer, and wherein ρ represents a common radius of curvature of the glass article.
Dependencies are inferred from the claim text.