Thin safety glass having improved mechanical characteristics
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03B-027/012
C03B-027/04
C03B-027/016
C03B-027/052
C03B-027/048
C03B-027/044
C03C-021/00
C03B-035/24
C03C-003/11
C03B-029/12
C03B-029/16
출원번호
US-0814335
(2015-07-30)
등록번호
US-10077204
(2018-09-18)
발명자
/ 주소
Maschmeyer, Richard Orr
Thomas, John Christopher
Wasson, Kevin Lee
출원인 / 주소
CORNING INCORPORATED
대리인 / 주소
Bean, Gregory V.
인용정보
피인용 횟수 :
0인용 특허 :
68
초록▼
A strengthened glass sheet product along with a process and an apparatus for strengthening a glass sheet are provided. The process comprises cooling the glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process resu
A strengthened glass sheet product along with a process and an apparatus for strengthening a glass sheet are provided. The process comprises cooling the glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened glass sheets having improved breakage properties.
대표청구항▼
1. A thermally strengthened glass sheet: the glass sheet having a thickness, expressed in millimeters, of t, a length, expressed in millimeters, of l, and a width, expressed in millimeters, of w, t being less than l and less than w;the glass sheet comprising a glass having a low temperature linear C
1. A thermally strengthened glass sheet: the glass sheet having a thickness, expressed in millimeters, of t, a length, expressed in millimeters, of l, and a width, expressed in millimeters, of w, t being less than l and less than w;the glass sheet comprising a glass having a low temperature linear CTE, expressed in 1/° C., of αSCTE, a high temperature linear CTE, expressed in 1/° C., of αLCTE, an elastic modulus, expressed in GPa, of E, a strain temperature, expressed in units of ° C., of Tstrain, and a softening temperature, expressed in units of ° C., of Tsoft;the glass sheet having a thermally induced central tension of less than 300 MPa and greater than P1CT(hCT)*t2(2P2CT(hCT)+t)·E·[Tstrain·αCTEs+αCTEL·(Tsoft-Tstrain)];in units of MPa;wherein P1CT is given by 910.2-259.2·exp(-hCT0.143);P2CT is given by 2.53+23.65(1+(hCT0.00738)1.58);and wherein hCT is a constant greater than or equal to 0.020, wherein the first major surface has a roughness in the range of from 0.2 to 0.4 nm Ra over an area of 10 μm×10 μm. 2. The glass sheet according to claim 1 wherein hCT is greater than or equal to 0.022. 3. The glass sheet according to claim 1 wherein hCT is greater than or equal to 0.024. 4. The glass sheet according to claim 1 wherein hCT is greater than or equal to 0.026. 5. The glass sheet according to claim 1 wherein hCT is greater than or equal to 0.028. 6. The glass sheet according to claim 1 wherein hCT is greater than or equal to 0.030. 7. The glass sheet according to claim 1 wherein hCT is greater than or equal to 0.0625. 8. The glass sheet according to claim 1 wherein hCT is greater than or equal to 0.065. 9. The glass sheet according to claim 1 wherein the first surface of the sheet is flat to 50 μm total indicator run-out (TIR) along any 50 mm or less profile of the first major surface. 10. The glass sheet according to claim 1 wherein the first major surface has a roughness in the range of from 0.2 to 0.3 nm Ra over an area of 10 μm×10 μm. 11. The glass sheet according to claim 1 wherein the first major surface has a coating. 12. The glass sheet according to claim 1, l and w each being at least 10 mm. 13. The glass sheet according to claim 1, l and w each being at least 40 mm. 14. The glass sheet according to claim 1, wherein the ratio l/t and the ratio w/t each are equal to 10/1 or more. 15. The glass sheet according to claim 13, wherein the ratio l/t and the ratio w/t each are equal to 20/1 or more. 16. The glass sheet according to claim 1, wherein the ratio l/t and the ratio w/t each are equal to 100/1 or more. 17. The glass sheet according to claim 1 wherein t is 6 mm or less. 18. The glass sheet according to claim 1 wherein t is 3 mm or less. 19. The glass sheet according to claim 1 wherein t is less than 2 mm. 20. The glass sheet according to claim 1 wherein t is 1 mm or less. 21. The glass sheet according to claim 15 wherein t is 0.7 mm or less. 22. The glass sheet according to claim 1 wherein t is 0.5 mm or less. 23. The glass sheet according to claim 1 wherein t is 0.28 mm or less. 24. The glass sheet according to claim 1 wherein the sheet exhibits a 50% cracking threshold at 5 Newtons or greater after a 15 second Vickers Hardness Test. 25. The glass sheet according to claim 21 wherein the sheet exhibits a 50% cracking threshold at 10 Newtons or greater after a 15 second Vickers Hardness Test. 26. A thermally strengthened glass sheet according to claim 1 wherein first major surface of the glass sheet having a thermally induced surface compressive stress of less than 600 MPa and greater than P1(h)*t(P2(h)+t)·E·[Tstrain·αCTEs+αCTEL·(Tsoft-Tstrain)];in units of MPa;wherein P1 is given by 910.2-259.2·exp(-h0.143);P2 is given by 2.53+23.65(1+(h0.00738)1.58);and h is a constant greater than or equal to 0.020. 27. The sheet according to claim 26 wherein h is greater than or equal to 0.026. 28. The glass sheet according to claim 1 wherein the glass has an annealing temperature, expressed in units of ° C., of Tanneal and a surface fictive temperature measured on the first major surface of the glass sheet represented by Tfs when expressed in units of ° C.; the glass sheet having a non-dimensional surface fictive temperature parameter θs given by (Tfs−Tanneal)/(Tsoft−Tanneal),wherein the parameter θs is in the range of from 0.20 to 0.9. 29. The glass sheet according to claim 28 wherein the parameter θs is in the range of from 0.50 to 0.9. 30. The glass sheet according to claim 1, wherein the compressive stress of said first major surface is larger than 80 MPa. 31. The glass sheet according to claim 1, wherein the compressive stress of said first major surface is larger than 100 MPa. 32. The glass sheet according to claim 1, wherein the compressive stress of said first major surface is larger than 150 MPa. 33. The glass sheet according to claim 1, wherein the central tension of the sheet is larger than 40 MPa. 34. The glass sheet according to claim 1, wherein the central tension of the sheet is larger than 50 MPa. 35. The glass sheet according to claim 1, wherein the central tension of the sheet is larger than 75 MPa. 36. The glass sheet according to claim 1, wherein the surface fictive temperature measured on the first surface of the sheet is at least 50° C. above a glass transition temperature of the glass. 37. The glass sheet according to claim 1, wherein the surface fictive temperature measured on the first surface of the sheet is at least 75° C. above a glass transition temperature of the glass.
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