Tempered glass substrate
Provided is a glass substrate satisfying ion exchange performance and devitrification resistance of a glass simultaneously and having higher mechanical strength compared to a conventional glass substrate. A tempered glass substrate which has a compression stress layer on a surface thereof, has a glass composition including, in terms of mole %, 50 to 85% of SiO 2 , 5 to 30% of Al 2 O 3 , 0 to 20% of Li 2 O, 0 to 20% of Na 2 O, 0 to 20% of K 2 O, 0.001 to 10% of TiO 2 , and 15 to 35% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 3 in terms of mole fraction, and is substantially free of As 2 O 3 and F.
1. A tempered glass substrate, comprising a compression stress layer on a plane surface thereof,
wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO 2 , 5 to 30% of Al 2 O 3 , 0 to 20% of Li 2 O, 7 to 20% of Na 2 O, 0 to 4% of K 2 O, 0.001 to 10% of TiO 2 , 0 to 0.1% of ZrO 2 , 0 to 1% of CaO, and 15 to 35% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 3 in terms of mole fraction, a K 2 O/(Li 2 O+Na 2 O+K 2 O) value of 0 to 0.11 in terms of mole fraction, and is substantially free of As 2 O 3 and F.
2. The tempered glass substrate according to claim 1 , wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO 2 , 5 to 12.5% of Al 2 O 3 , 0 to 7% of B 2 O 3 , 0 to 9% of Li 2 O, 7 to 20% of Na 2 O, 0 to 4% of K 2 O, 0.001 to 8% of TiO 2 , 0 to 0.1% of ZrO 2 , 0 to 1% of CaO, and 15 to 35% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 2.7 in terms of mole fraction, a (MgO+CaO)/Al 2 O 3 value of 0 to 0.55 in terms of mole fraction, a K 2 O/(Li 2 O+Na 2 O+K 2 O) value of 0 to 0.11 in terms of mole fraction, and is substantially free of As 2 O 3 and F.
3. The tempered glass substrate according to claim 1 , wherein a compression stress of the plane surface is 100 MPa or more and a depth of the compression stress layer is 1 μm or more.
4. The tempered glass substrate according to claim 1 , wherein the plane surface is an unpolished surface.
5. The tempered glass substrate according to claim 1 , wherein the tempered glass substrate is formed by an overflow down-draw method.
6. The tempered glass substrate according to claim 1 , wherein the tempered glass substrate has a liquidus temperature of 1300° C. or lower.
7. The tempered glass substrate according to claim 1 , wherein the tempered glass substrate has a liquidus viscosity of 10 4.0 dPa·s or more.
8. The tempered glass substrate according to claim 1 , wherein the tempered glass substrate is cut after forming the compression stress layer by an ion exchange.
9. The tempered glass substrate according to claim 1 , wherein the tempered glass substrate has a liquidus viscosity of 10 5.0 dPa·s or more.
10. The tempered glass substrate according to claim 1 , wherein the tempered glass has a thermal expansion coefficient at 30 to 380° C. of 40 to 95×10 −7 /° C.
11. The tempered glass substrate according to claim 1 , wherein the tempered glass has a crack generation ratio of 60% or less.
12. The tempered glass substrate according to claim 1 , which is used as a touch panel display.
13. A tempered glass substrate, comprising a compression stress layer on a plane surface thereof,
wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO 2 , 5 to 30% of Al 2 O 3 , 0 to 7% of B 2 O 3 , 0.5 to 20% of Li 2 O, 7 to 20% of Na 2 O, 0 to 4% of K 2 O, 0.001 to 10% of TiO 2 , 0 to 0.1% of ZrO 2 , 0 to 1% of CaO, and 15 to 35% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , and has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 3 in terms of mole fraction, and a K 2 O /(Li 2 O+Na 2 O+K 2 O) value of 0 to 0.11 in terms of mole fraction.
14. The tempered glass substrate according to claim 13 , wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO 2 , 5 to 12.5% of Al 2 O 3 , 0 to 7% of B 2 O 3 , 0.5 to 10% of Li 2 O, 7 to 20% of Na 2 O, 0 to 4% of K 2 O, 0.01 to 10% of TiO 2 , 0 to 0.1% of ZrO 2 , 0 to 1% of CaO, and 15 to 28.5% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , and has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 2.7 in terms of mole fraction, and a K 2 O/(Li 2 O+Na 2 O+K 2 O) value of 0 to 0.11 in terms of mole fraction.
15. The tempered glass substrate according to claim 13 , wherein a compression stress of the surface is 100 MPa or more and a depth of the compression stress layer is 1 μm or more.
16. The tempered glass substrate according to claim 13 , wherein the plane surface is an unpolished surface.
17. The tempered glass substrate according to claim 13 , wherein the tempered glass substrate is formed by an overflow down-draw method.
18. The tempered glass substrate according to claim 13 , wherein the tempered glass substrate has a liquidus temperature of 1300° C. or lower.
19. The tempered glass substrate according to claim 13 , wherein the tempered glass substrate has a liquidus viscosity of 10 4.0 dPa·s or more.
20. The tempered glass substrate according to claim 13 , wherein the tempered glass substrate is cut after forming the compression stress layer by an ion exchange.
21. The tempered glass substrate according to claim 13 , wherein the tempered glass substrate has a liquidus viscosity of 10 5.0 dPa·s or more.
22. The tempered glass substrate according to claim 13 , wherein the tempered glass has a thermal expansion coefficient at 30 to 380° C. of 40 to 95×10 −7 /° C.
23. The tempered glass substrate according to claim 13 , wherein the tempered glass has a crack generation ratio of 60% or less.
24. The tempered glass substrate according to claim 13 , which is used as a touch panel display.
25. A tempered glass, which has a glass composition comprising, in terms of mole %, 50 to 85% of SiO 2 , 5 to 30% of Al 2 O 3 , 0 to 20% of Li 2 O, 7 to 20% of Na 2 O, 0 to 4% of K 2 O, 0.001 to 10% of TiO 2 , 0 to 0.1% of ZrO 2 , 0 to 1% of CaO, and 15 to 35% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 3 in terms of mole fraction, a K 2 O/(Li 2 O+Na 2 O+K 2 O) value of 0 to 0.11 in terms of mole fraction, is substantially free of As 2 O 3 and F, and has a compression stress layer formed on a plane surface.
26. A tempered glass, which has a glass composition comprising, in terms of mole %, 50 to 85% of SiO 2 , 5 to 30% of Al 2 O 3 , 0 to 7% of B 2 O 3 , 0.5 to 20% of Li 2 O, 7 to 20% of Na 2 O, 0 to 4% of K 2 O, 0.001 to 10% of TiO 2 , 0 to 0.1% of ZrO 2 , and 15 to 35% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 3 in terms of mole fraction, a K 2 O/(Li 2 O+Na 2 O+K 2 O) value of 0 to 0.11 in terms of mole fraction, and has a compression stress layer formed on a plane surface.
27. A glass, which has a glass composition comprising, in terms of mole %, 50 to 85% of SiO 2 , 5 to 30% of Al 2 O 3 , 0 to 20% of Li 2 O, 7 to 20% of Na 2 O, 0 to 4% of K 2 O, 0.001 to 10% of TiO 2 , 0 to 0.1% of ZrO 2 , 0 to 1% of CaO, and 15 to 35% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 3 in terms of mole fraction, a K 2 O/(Li 2 O+Na 2 O+K 2 O) value of 0 to 0.11 in terms of mole fraction, and is substantially free of As 2 O 3 and F.
28. A glass according to claim 27 , which has, when ion exchange is carried out in a KNO 3 molten salt at 430° C. for 4 hours, a compression stress of a surface of 200 MPa or more and a depth of compression stress layer of 3 μm or more.
29. A glass, which has a glass composition comprising, in terms of mole %, 50 to 85% of SiO 2 , 5 to 30% of Al 2 O 3 , 0 to 7% of B 2 O 3 , 0.5 to 20% of Li 2 O, 7 to 20% of Na 2 O, 0 to 4% of K 2 O, 0.001 to 10% of TiO 2 , 0 to 0.1% of ZrO 2 , 0 to 1% of CaO, and 15 to 35% of Li 2 O+Na 2 O+K 2 O+Al 2 O 3 , and has a (Li 2 O+Na 2 O+K 2 O)/Al 2 O 3 value of 0.7 to 3 in terms of mole fraction and a K 2 O/(Li 2 O+Na 2 O+K 2 O) value of 0 to 0.11 in terms of mole fraction.
30. The glass according to claim 29 , wherein when an ion exchange is carried out in a KNO 3 molten salt at 430° C. for 4 hours, the glass has a compression stress of the compression stress layer of 200 MPa or more and a depth of the compression stress layer of 3 μm or more.