Strengthened glass articles and methods of making
First Claim
Patent Images
1. A strengthened glass article, the strengthened glass article having a thickness t<
- 0.5 mm and comprising;
an outer region having a depth of layer of at least 30 μ
m and a compressive stress of at least 600 MPa,an inner region, wherein the inner region is under a central tension CT, and wherein CT(MPa)>
15.7 (MPa/mm)·
t(mm)+52.5 (MPa) and wherein the strengthened glass article has a frangibility index of less than 3.
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Abstract
A strengthened glass article having a central tension that is below a threshold value above which the glass exhibits frangible behavior. The central tension varies non-linearly with the thickness of the glass. The glass article may be used as cover plates or windows for portable or mobile electronic devices such as cellular phones, music players, information terminal (IT) devices, including laptop computers, and the like.
101 Citations
24 Claims
-
1. A strengthened glass article, the strengthened glass article having a thickness t<
- 0.5 mm and comprising;
an outer region having a depth of layer of at least 30 μ
m and a compressive stress of at least 600 MPa,an inner region, wherein the inner region is under a central tension CT, and wherein CT(MPa)>
15.7 (MPa/mm)·
t(mm)+52.5 (MPa) and wherein the strengthened glass article has a frangibility index of less than 3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- 0.5 mm and comprising;
-
15. A strengthened glass article, the strengthened glass article having a thickness t≦
- 0.5 mm and comprising;
an outer region having a depth of layer of at least 30 μ
m and a compressive stress of at least 600 MPa; andan inner region under a central tension CT, wherein CT (MPa)>
15.7 (MPa/mm)·
t(mm)+52.5 (MPa),wherein the strengthened glass article is substantially non-frangible when subjected to a point impact that is sufficient to break the strengthened glass article, and wherein the strengthened glass article has a frangibility index of less than 3, and wherein when the strengthened glass article is broken by the point impact, the strengthened glass article exhibits at least one of fragment size n1 (%≦
1 mm) of 0%≦
n1≦
5%, fragment density n2 (fragments/cm2) of 0 fragments/cm2≦
n2≦
3 fragments/cm2, crack branching n3 of 0≦
n3≦
5 and ejection n4 (%≧
5 cm) of 0%≦
n42%, or combinations thereof. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
- 0.5 mm and comprising;
Specification