US 12,071,369 B2
S-shaped stress profiles and methods of making
Matthew John Dejneka, Corning, NY (US); Pascale Oram, Painted Post, NY (US); Rostislav Vatchev Roussev, Painted Post, NY (US); Vitor Marino Schneider, Painted Post, NY (US); Charlene Marie Smith, Corning, NY (US); and Zhongzhi Tang, Guangdong (CN)
Assigned to CORNING INCORPORATED, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Feb. 2, 2023, as Appl. No. 18/105,040.
Application 18/105,040 is a continuation of application No. 16/837,286, filed on Apr. 1, 2020, granted, now 11,584,684.
Application 16/837,286 is a continuation of application No. 15/372,520, filed on Dec. 8, 2016, granted, now 10,611,681, issued on Apr. 7, 2020.
Claims priority of provisional application 62/280,376, filed on Jan. 19, 2016.
Claims priority of provisional application 62/264,495, filed on Dec. 8, 2015.
Prior Publication US 2023/0174422 A1, Jun. 8, 2023
Int. Cl. C03C 21/00 (2006.01); C03C 3/097 (2006.01); G06F 1/16 (2006.01)
CPC C03C 21/002 (2013.01) [C03C 3/097 (2013.01); G06F 1/1637 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A glass article, comprising:
opposing first and second surfaces defining a thickness t;
a center located at t/2;
a stress profile comprising:
a compressive region extending from the first surface to a depth of compression (DOC);
a maximum compressive stress (CS) within the compressive region;
a first region of the compressive region extending from the first surface to a depth d1, wherein d1>0.06t, and at least a portion of the first region has a first slope m1;
a second region of the compressive region extending from d1 to the DOC, and having a second slope m2, wherein |m1|≤|m2|;
a first region sub-region including an entire compressive stress spike extending from the first surface to a depth d2 that is located at a spike compressive stress, and comprising a third slope m3, wherein d2<d1, and |m1|<|m3|; and
a compressive region sub-region within the compressive region having a negative curvature;
wherein the spike compressive stress at d2 is in a range from greater than or equal to 150 MPa to less than or equal to 180 MPa.
 
16. A glass article, comprising:
opposing first and second surfaces defining a thickness t;
a center located at t/2;
a stress profile comprising:
a compressive region extending from the first surface to a depth of compression (DOC) that is greater than or equal to 90 μm;
a maximum compressive stress (CS) within the compressive region in a range from about 500 MPa to about 2,000 MPa;
a first region of the compressive region extending from the first surface to a depth d1, wherein d1>0.06t, and at least a portion of the first region has a first slope m1;
a second region extending from d1 to the DOC, and having a second slope m2, wherein |m1|≤|m2|;
a first region sub-region including an entire compressive stress spike extending from the first surface to a depth d2 that is located at a spike compressive stress, and comprising a third slope m3, wherein: d2<d1, and |m1|<|m3| and 30 MPa/μm≤|m3|≤200 MPa/μm;
the spike compressive stress at d2 being in a range from greater than or equal to 150 MPa to less than or equal to 180 MPa; and
a compressive region sub-region within the compressive region with a negative curvature.
 
20. A glass article, comprising:
opposing first and second surfaces defining a thickness t;
a center located at t/2;
a stress profile comprising:
a compressive region extending from the first surface to a depth of compression (DOC);
a maximum compressive stress (CS) within the compressive region;
a first region of the compressive region extending from the first surface to a depth d1, wherein d1>0.06t, and at least a portion of the first region has a first slope m1;
a second region of the compressive region extending from d1 to the DOC, and having a second slope m2, wherein |m1|≤|m2|;
a first region sub-region extending from the first surface to a depth d2 and comprising a third slope m3, wherein d2<d1, and |m1|<|m3|; and
a compressive region sub-region within the compressive region having a negative curvature, the negative curvature has an absolute value exceeding 10 MPa/(t(mm))2 over a spatial extent ranging from about 2% to about 25% of t;
wherein a spike compressive stress at d2 is in a range from greater than or equal to 150 MPa to less than or equal to 180 MPa.