GLASS-CEREMIC ARTICLE AND GLASS-SERAMIC FOR ELECTRONIC DEVICE COVER PLATE

Abstract

The present invention discloses a glass-ceramic article and a glass-ceramic for an electric device cover plate, the glass-ceramic comprises, as a predominant crystalline phase, lithium silicate and the quartz crystalline phase, and has a composition expressed in weight percent including: SiO.sub.2: 65-85%, Al.sub.2O.sub.3: 1-15%, Li.sub.2O: 5-15%, ZrO.sub.2: 0.1-10%, P.sub.2O.sub.5: 0.1-10%, K.sub.2O: 0-10%, MgO: 0-10%, ZnO: 0-10%, and Na.sub.2O: 0-5%, wherein (SiO.sub.2+Al.sub.2O.sub.3+Li.sub.2O+ZrO.sub.2)/P.sub.2O.sub.5 is 40-90, the falling ball test height is 700 mm or more. By reasonable component design, the present invention achieves excellent mechanical properties of the glass-ceramic and the glass-ceramic article of the present invention and obtains the glass-ceramic or the glass-ceramic article suitable for electronic devices at a lower cost.

Claims

1. A glass-ceramic article for an electronic device cover plate, comprising, as a predominant crystalline phase, lithium silicate and a quartz crystalline phase, and having a composition comprising in weight percent following components: SiO.sub.2: 65-85%, Al.sub.2O.sub.3: 1-15%, Li.sub.2O: 5-15%, ZrO.sub.2: 0.1-10%, K.sub.2O: 0-10%, MgO: 0-10%, ZnO: 0-10%, Na.sub.2O: 0-5%, and P.sub.2O.sub.5 being greater than 0.79% and less than 2.5%, wherein (SiO.sub.2+Al.sub.2O.sub.3+Li.sub.2O+ZrO.sub.2)/P.sub.2O.sub.5 is 40-90, (Al.sub.2O.sub.3+Li.sub.2O)/P.sub.2O.sub.5 is 8.5-20, and (K.sub.2O+MgO)/ZrO.sub.2 is 0.7-1.2, and a falling ball test height is 700 mm or more, indicating when a steel ball of 132 g is dropped from the falling ball test height, a sample of the glass-ceramic article of 150570.55 mm is not broken into pieces.

2. The glass-ceramic article for the electronic device cover plate according to claim 1, further comprising in weight percent following components: SrO: 0-5%, BaO: 0-5%, TiO.sub.2: 0-5%, Y.sub.2O.sub.3: 0-5%, B.sub.2O.sub.3: 0-3%, and a fining agent: 0-2%.

3. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (SiO.sub.2+Li.sub.2O)/Al.sub.2O.sub.3 is 6-15, (SiO.sub.2+Li.sub.2O)/P.sub.2O.sub.5 is 40-80, or Li.sub.2O/(K.sub.2O+ZrO.sub.2) is 2.3-4.0.

4. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (SiO.sub.2+Li.sub.2O)/Al.sub.2O.sub.3 is 8-13, (SiO.sub.2+Li.sub.2O)/P.sub.2O.sub.5 is 40-70, (SiO.sub.2+Al.sub.2O.sub.3+Li.sub.2O+ZrO.sub.2)/P.sub.2O.sub.5 is 45-85, (K.sub.2O+MgO)/ZrO.sub.2 is 0.7-1.1, or Li.sub.2O/(K.sub.2O+ZrO.sub.2) is 2.5-3.5.

5. The glass-ceramic article for the electronic device cover plate according to claim 1, comprising in weight percent following components: SiO.sub.2: 70-76%, Al.sub.2O.sub.3: 4-10%, Li.sub.2O: 8-12.5%, ZrO.sub.2: 1-5%, P.sub.2O.sub.5: 1-2.42%, K.sub.2O: 0-3%, MgO: 0.3-2%, ZnO: 0-3%, Na.sub.2O: 0-1%, Sb.sub.2O.sub.3: 0-1%, SnO.sub.2: 0-1%, SnO: 0-1%, or CeO.sub.2: 0-1%.

6. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (Al.sub.2O.sub.3+Li.sub.2O)/P.sub.2O.sub.5 is 8.5-14; (SiO.sub.2+Li.sub.2O)/P.sub.2O.sub.5 is 45-60, (SiO.sub.2+Al.sub.2O3+Li.sub.2O+ZrO.sub.2)/P.sub.2O.sub.5 is 48-80, or (SiO.sub.2+Li.sub.2O)/Al.sub.2O.sub.3 is 8.5-12.

7. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (K.sub.2O+MgO)/ZrO.sub.2 is 0.8-1.0, or Li.sub.2O/(K.sub.2O+ZrO.sub.2) is 2.8-3.3.

8. The glass-ceramic article for the electronic device cover plate according to claim 1, comprising in weight percent Li.sub.2O 8%less than 10%, free of SrO, free of BaO, free of TiO.sub.2, free of Y.sub.2O.sub.3, free of GeO.sub.2, free of CaO, free of Cs.sub.2O, free of PbO, free of B.sub.2O.sub.3, free of As.sub.2O.sub.3, free of La.sub.2O.sub.3 and free of Tb.sub.2O.sub.3.

9. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein a crystallinity is 70% or more.

10. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein a falling ball test height is 1000 mm or more; or a four-point bending strength is 650 MPa or more; or a haze for a thickness of 0.55 mm is 0.5% or less; or a thermal refractive index coefficient is 0.810.sup.6/ C. or less; or a light transmittance for a thickness of 0.55 mm at a wavelength of 550 nm is 88% or more.

11. A glass-ceramic, comprising, as a predominant crystalline phase, lithium silicate and a quartz crystalline phase, and having a composition consisting of in weight percent following components: SiO.sub.2: 65-85%, Al.sub.2O.sub.3: 1-15%, Li.sub.2O: 5-15%, ZrO.sub.2: 0.1-10%, K.sub.2O: 0-10%, MgO: 0-10%, ZnO: 0-10%, Na.sub.2O: 0-3%, Sb.sub.2O.sub.3: 0-1%, SnO.sub.2: 0-1%, SnO: 0-1%, CeO.sub.2: 0-1%, and P.sub.2O.sub.5 being greater than 0.79% and less than 2.5%, wherein (SiO.sub.2+Al.sub.2O.sub.3+Li.sub.2O+ZrO.sub.2)/P.sub.2O.sub.5 is 40-90, (Al.sub.2O.sub.3+Li.sub.2O)/P.sub.2O.sub.5 is 8.5-20 and (K.sub.2O+MgO)/ZrO.sub.2 is 0.7-1.2; and a haze for a thickness of 0.55 mm is 0.5% or less.

12. The glass-ceramic according to claim 11, wherein (SiO.sub.2+Al.sub.2O.sub.3+Li.sub.2O+ZrO.sub.2)/P.sub.2O.sub.5 is 45-85; (SiO.sub.2+Li.sub.2O)/Al.sub.2O.sub.3 is 8-13; (Al.sub.2O.sub.3+Li.sub.2O)/P.sub.2O.sub.5 is 8.5-14; (SiO.sub.2+Li.sub.2O)/P.sub.2O.sub.5 is 40-70; or Li.sub.2O/(K.sub.2O+ZrO.sub.2) is 2.5-3.5.

13. The glass-ceramic according to claim 11, wherein SiO.sub.2: 70-76%, Al.sub.2O.sub.3: 4-10%, Li.sub.2O: 8-12.5%, ZrO.sub.2: 1-5%, P.sub.2O.sub.5: 1-2.42%, K.sub.2O: 0-3%, MgO: 0.3-2%, ZnO: 0-3%, and Na.sub.2O: 0-1%.

14. The glass-ceramic according to claim 11, wherein (K.sub.2O+MgO)/ZrO.sub.2 is 0.8-1.0, or Li.sub.2O/(K.sub.2O+ZrO.sub.2) is 2.8-3.3.

15. The glass-ceramic according to claim 11, wherein a crystallinity is 70% or more; or a grain size is 80 nm or less; or a thermal refractive index coefficient is 0.810.sup.6/ C. or less; or an average light transmittance for a thickness of 1 mm at a wavelength of 400-800 nm is 85% or more.

16. A glass cover plate for an electronic device, comprising the glass-ceramic article for the electronic device cover plate claimed in claim 1.

17. A glass cover plate for an electronic device, comprising the glass-ceramic claimed in claim 11.

18. An electronic device, comprising the glass-ceramic article for the electronic device cover plate claimed in claim 1.

19. An electronic device, comprising the glass-ceramic claimed in claim 11.

20. An electronic device, comprising the glass cover plate for the electronic device claimed in claim 16.

21. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein 43.35<(SiO.sub.2+Li.sub.2O)/P.sub.2O.sub.580.

22. The glass-ceramic according to claim 11, wherein 43.35<(SiO.sub.2+Li.sub.2O)/P.sub.2O.sub.580.

23. The glass-ceramic according to claim 11, wherein a grain size is 50 nm or less.

24. The glass-ceramic according to claim 11, wherein a grain size is 40 nm or less.

25. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein MgO is 0.3-10%.

26. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein K.sub.2O is 0.5-1.1%.

27. The glass-ceramic article for the electronic device cover plate according to claim 25, wherein K.sub.2O is 0.5-1.1%.

28. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (SiO.sub.2+Li.sub.2O)/Al.sub.2O.sub.3 is 6-15, (SiO.sub.2+Li.sub.2O)/P.sub.2O.sub.5 is 40-80, and Li.sub.2O/(K.sub.2O+ZrO.sub.2) is 2.3-4.0.

Description

EXAMPLES

[0140] The following non-limiting examples are provided to further clearly illustrate and explain the technical solutions of the present invention. The examples provided in the present invention are made in many efforts to ensure the accuracy of the values (e.g. the quantity, the temperature, etc.), however, the errors and the deviations must be taken into consideration. The composition itself is provided in wt % based on an oxide and has been normalized to 100%.

[0141] The examples for the glass composition are shown in Tables 1-3 below.

TABLE-US-00001 TABLE 1 Components (wt %) 1 2 3 4 5 6 7 8 SiO.sub.2 75.5 75.5 75.3 74.6 74.2 79.0 78.5 76.5 Al.sub.2O.sub.3 8.5 7.6 8.5 9.5 9.8 7.0 8.0 8.0 Li.sub.2O 9.5 9.6 10.0 9.5 9.3 9.0 8.0 10.0 K.sub.2O 1.0 1.0 0.5 1.0 1.0 0.8 1.0 0.6 ZnO 0.7 0.5 0.5 1.0 0.6 0.0 0.4 0.5 MgO 1.0 1.0 1.0 0.9 1.0 1.0 1.0 1.0 P.sub.2O.sub.5 1.8 1.9 2.0 1.5 1.7 1.2 1.1 1.4 ZrO.sub.2 2.0 2.4 2.2 2.0 2.0 2.0 2.0 2.0 Sb.sub.2O.sub.3 0.0 0.5 0.0 0.0 0.3 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2O.sub.3 10.00 11.20 10.04 8.85 8.52 12.57 10.81 10.81 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 47.22 44.79 42.65 56.07 49.12 73.33 78.64 61.79 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 10.00 9.05 9.25 12.67 11.24 13.33 14.55 12.86 (SiO.sub.2 +Al.sub.2O.sub.3 + Li.sub.2O + ZrO.sub.2)/P.sub.2O.sub.5 53.06 50.05 48.00 63.73 56.06 80.83 87.73 68.93 (MgO + K.sub.2O)/ZrO.sub.2 1.00 0.83 0.68 0.95 1.00 0.90 1.00 0.80 Li.sub.2O/(K.sub.2O + ZrO.sub.2) 3.17 2.82 3.70 3.17 3.10 3.21 2.67 3.85 Thermal Expansion Coefficient 64 62 58 65 64 57 55 59 (.sub.20 C.-120 C.)(10.sup.7/K) Refractive Index (nd) 1.5215 1.5206 1.5159 1.5233 1.5219 1.5189 1.5142 1.5177

TABLE-US-00002 TABLE 2 Components (wt %) 9 10 11 12 13 14 15 16 SiO.sub.2 72.0 71.9 73.0 73.5 76.0 74.0 74.5 74.5 Al.sub.2O.sub.3 9.5 9.0 8.0 7.8 6.9 7.9 7.8 9.5 Li.sub.2O 10.0 10.0 9.9 10.0 9.6 10.0 9.7 9.0 K.sub.2O 0.5 1.0 1.0 1.0 1.0 0.6 1.1 0.9 ZnO 1.0 2.5 2.3 2.3 0.8 1.2 1.3 0.9 MgO 2.0 1.0 1.5 1.0 1.0 1.5 1.0 1.0 P.sub.2O.sub.5 1.8 1.9 1.8 1.9 2.0 2.0 1.9 1.8 ZrO.sub.2 3.0 2.2 2.5 2.2 2.2 2.5 2.2 2.2 Sb.sub.2O.sub.3 0.2 0.0 0.0 0.3 0.5 0.3 0.3 0.2 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2O.sub.3 8.63 9.10 10.36 10.71 12.41 10.63 10.79 8.79 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 45.56 43.11 46.06 43.95 42.80 42.00 44.32 46.39 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 10.83 10.00 9.94 9.37 8.25 8.95 9.21 10.28 (SiO.sub.2 + Al.sub.2O.sub.3 + Li.sub.2 O + ZrO.sub.2)/P.sub.2O.sub.5 52.50 49.00 51.89 49.21 47.35 47.20 49.58 52.89 (MgO + K.sub.2O)/ZrO.sub.2 0.83 0.91 1.00 0.91 0.91 0.84 0.95 0.86 Li.sub.2O/(K.sub.2O + ZrO.sub.2) 2.86 3.13 2.83 3.13 3.00 3.23 2.94 2.90 Thermal Expansion Coefficient 63 63 64 61 57 59 59 63 (.sub.20 C.-120 C.)(10.sup.7/K) Refractive Index (nd) 1.5243 1.522 1.5239 1.5211 1.5135 1.5146 1.5232 1.524

TABLE-US-00003 TABLE 3 Components (wt %) 17 18 19 20 21 22 23 SiO.sub.2 74.9 72.5 72.7 75.9 75.8 75.7 75.5 Al.sub.2O.sub.3 8.5 7.5 9.5 7.0 7.3 7.5 7.8 Li.sub.2O 10.0 12.0 9.5 9.9 9.8 9.7 9.6 K.sub.2O 1.0 1.5 1.0 1.0 1.0 1.0 1.0 ZnO 0.2 1.7 1.9 0.9 0.8 0.8 0.8 MgO 1.0 0.5 1.0 1.0 1.0 1.0 1.0 P.sub.2O.sub.5 2.0 1.9 1.9 1.9 1.9 1.9 1.9 ZrO.sub.2 2.2 2.2 2.0 2.2 2.2 2.2 2.2 Sb.sub.2O.sub.3 0.2 0.2 0.5 0.2 0.2 0.2 0.2 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2O.sub.3 9.99 11.27 8.65 12.26 11.73 11.39 10.91 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 42.45 44.47 43.26 45.16 45.05 44.95 44.79 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 9.25 10.26 10.00 8.89 9.00 9.05 9.16 (SiO.sub.2 + Al.sub.2O.sub.3 + Li.sub.2O + ZrO.sub.2)/P.sub.2O.sub.5 47.80 49.58 49.32 50.00 50.05 50.05 50.05 (MgO + K.sub.2O)/ZrO.sub.2 0.91 0.91 1.00 0.91 0.91 0.91 0.91 Li.sub.2O/(K.sub.2O + ZrO.sub.2 ) 3.13 3.24 3.17 3.09 3.06 3.03 3.00 Thermal Expansion Coefficient 63 62 63 61 64 61 60 (.sub.20 C.-120 C.)(10.sup.7/K) Refractive Index (nd) 1.5192 1.5224 1.5233 1.5226 1.5244 1.5213 1.5214

[0142] The examples for the glass-ceramic are shown in Tables 4-6 below.

TABLE-US-00004 TABLE 4 Components (wt %) 1 2 3 4 5 6 7 8 SiO.sub.2 75.5 75.5 75.3 74.6 74.2 79.0 78.5 76.5 Al.sub.2O.sub.3 8.5 7.6 8.5 9.5 9.8 7.0 8.0 8.0 Li.sub.2O 9.5 9.6 10.0 9.5 9.3 9.0 8.0 10.0 K.sub.2O 1.0 1.0 0.5 1.0 1.0 0.8 1.0 0.6 ZnO 0.7 0.5 0.5 1.0 0.6 0.0 0.4 0.5 MgO 1.0 1.0 1.0 0.9 1.0 1.0 1.0 1.0 P.sub.2O.sub.5 1.8 1.9 2.0 1.5 1.7 1.2 1.1 1.4 ZrO.sub.2 2.0 2.4 2.2 2.0 2.0 2.0 2.0 2.0 Sb.sub.2O.sub.3 0.0 0.5 0.0 0.0 0.3 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2O.sub.3 10.00 11.20 10.04 8.85 8.52 12.57 10.81 10.81 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 47.22 44.79 42.65 56.07 49.12 73.33 78.64 61.79 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 10.00 9.05 9.25 12.67 11.24 13.33 14.55 12.86 (SiO.sub.2 + Al.sub.2O.sub.3 + Li.sub.2O + ZrO.sub.2)/P.sub.2O.sub.5 53.06 50.05 48.00 63.73 56.06 80.83 87.73 68.93 (MgO + K.sub.2O)/ZrO.sub.2 1.00 0.83 0.68 0.95 1.00 0.90 1.00 0.80 Li.sub.2O/(K.sub.2O + ZrO.sub.2) 3.17 2.82 3.70 3.17 3.10 3.21 2.67 3.85 Haze for Thickness of 0.55 mm (%) 0.25 0.34 0.44 0.20 0.35 0.39 0.40 0.42 Grain Size (nm) 40 40 45 40 40 50 45 45 Thermal Refractive Index 1.4 1.5 0.8 1.4 1.4 1.1 0.9 0.8 Coefficient (10.sup.6/ C.) Crystallinity 0.81 0.82 0.7 0.8 0.82 0.77 0.75 0.74 Refractive Index (nd) 1.5415 1.5406 1.5359 1.5433 1.5419 1.5389 1.5342 1.5377 Average Light Transmittance for 0.87 0.86 0.85 0.88 0.88 0.85 0.85 0.85 Thickness of 1 mm at 400-800 nm Light Transmittance for Thickness 0.92 0.91 0.88 0.92 0.92 0.88 0.9 0.89 of 0.55 mm at Wavelength of 550 nm Predominant Crystalline Phase quartz quartz quartz quartz quartz quartz quartz quartz crystalline crystalline crystalline crystalline crystalline crystalline crystalline crystalline phase and phase and phase and phase and phase phase and phase and phase and lithium lithium lithium lithium lithium lithium lithium lithium disilicate disilicate disilicate disilicate disilicate disilicate disilicate disilicate and petalite First Temperature and 540 C.- 560 C.- 570 C.- 590 C.- 580 C.- 590 C.- 600 C.- 590 C.- Time for Crystallization 10 h 10 h 10 h 10 h 6 h 10 h 10 h 10 h Second Temperature and 770 C.- 740 C.- 800 C.- 715 C.- 690 C.- 710 C.- 730 C.- 730 C.- Time for Crystallization 0.5 h 4 h 0.5 h 1 h 2 h 6 h 2 h 1 h

TABLE-US-00005 TABLE 5 Components (wt %) 9 10 11 12 13 14 15 16 SiO.sub.2 72.0 71.9 73.0 73.5 76.0 74.0 74.5 74.5 Al.sub.2O.sub.3 9.5 9.0 8.0 7.8 6.9 7.9 7.8 9.5 Li.sub.2O 10.0 10.0 9.9 10.0 9.6 10.0 9.7 9.0 K.sub.2O 0.5 1.0 1.0 1.0 1.0 0.6 1.1 0.9 ZnO 1.0 2.5 2.3 2.5 0.8 1.2 1.3 0.9 MgO 2.0 1.0 1.5 1.0 1.0 1.5 1.0 1.0 P.sub.2O.sub.5 1.8 1.9 1.8 1.9 2.0 2.0 1.9 1.8 ZrO.sub.2 3.0 2.2 2.5 2.2 2.2 2.5 2.2 2.2 Sb.sub.2O.sub.3 0.2 0.0 0.0 0.3 0.5 0.3 0.3 0.2 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2O.sub.3 8.63 9.10 10.36 10.71 12.41 10.63 10.79 8.79 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 45.56 43.11 46.06 43.95 42.80 42.00 44.32 46.39 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 10.83 10.00 9.94 9.37 8.25 8.95 9.21 10.28 (SiO.sub.2 + Al.sub.2O.sub.3 + Li.sub.2O + ZrO.sub.2)/P.sub.2O.sub.5 52.50 49.00 51.89 49.21 47.35 47.20 49.58 52.89 (MgO + K.sub.2O)/ZrO.sub.2 0.83 0.91 1.00 0.91 0.91 0.84 0.95 0.86 Li.sub.2O/(K.sub.2O + ZrO.sub.2) 2.86 3.13 2.83 3.13 3.00 3.23 2.94 2.90 Haze for Thickness of 0.55 mm (%) 0.35 0.36 0.24 0.35 0.38 0.38 0.39 0.26 Grain Size (nm) 40 40 40 40 50 45 45 40 Thermal Refractive Index 1.4 1.3 1.4 1.2 1.1 1.5 1.4 1.3 Coefficient (10.sup.6/ C.) Crystallinity 0.83 0.8 0.83 0.81 0.78 0.82 0.81 0.83 Refractive Index (nd) 1.5443 1.542 1.5439 1.5411 1.5335 1.5346 1.5432 1.544 Average Light Transmittance for 0.87 0.87 0.88 0.87 0.85 0.85 0.85 0.88 Thickness of 1 mm at 400-800 nm Light Transmittance for Thickness 0.92 0.9 0.92 0.9 0.89 0.9 0.89 0.92 of 0.55 mm at Wavelength of 550 nm Predominant Crystalline Phase quartz quartz quartz quartz quartz quartz quartz quartz crystalline crystalline crystalline crystalline crystalline crystalline crystalline crystalline phase and phase and phase and phase and phase and phase and phase and phase and lithium lithium lithium lithium lithium lithium lithium lithium disilicate disilicate disilicate disilicate disilicate disilicate disilicate disilicate First Temperature and 510 C.- 510 C.- 510 C.- 550 C.- 520 C.- 520 C.- 520 C.- 510 C.- Time for Crystallization 6 h 4 h 4 h 10 h 8 h 6 h 6 h 4 h Second Temperature and 710 C.- 715 C.- 740 C.- 710 C.- 715 C.- 720 C.- 720 C.- 715 C.- Time for Crystallization 6 h 4 h 0.5 h 6 h 4 h 2 h 1 h 4 h

TABLE-US-00006 TABLE 6 Components (wt %) 17 18 19 20 21 22 23 SiO.sub.2 74.9 72.5 72.7 75.9 75.8 75.7 75.5 Al.sub.2O.sub.3 8.5 7.5 9.5 7.0 7.3 7.5 7.8 Li.sub.2O 10.0 12.0 9.5 9.9 9.8 9.7 9.6 K.sub.2O 1.0 1.5 1.0 1.0 1.0 1.0 1.0 ZnO 0.2 1.7 1.9 0.9 0.8 0.8 0.8 MgO 1.0 0.5 1.0 1.0 1.0 1.0 1.0 P.sub.2O.sub.5 2.0 1.9 1.9 1.9 1.9 1.9 1.9 ZrO.sub.2 2.2 2.2 2.0 2.2 2.2 2.2 2.2 Sb.sub.2O.sub.3 0.2 0.2 0.5 0.2 0.2 0.2 0.2 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2O.sub.3 9.99 11.27 8.65 12.26 11.73 11.39 10.91 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 42.45 44.47 43.26 45.16 45.05 44.95 44.79 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 9.25 10.26 10.00 8.89 9.00 9.05 9.16 (SiO.sub.2 + Al.sub.2O.sub.3 + Li.sub.2O + ZrO.sub.2)/P.sub.2O.sub.5 47.80 49.58 49.32 50.00 50.05 50.05 50.05 (MgO + K.sub.2O)/ZrO.sub.2 0.91 0.91 1.00 0.91 0.91 0.91 0.91 Li.sub.2O/(K.sub.2O + ZrO.sub.2) 3.13 3.24 3.17 3.09 3.06 3.03 3.00 Haze for Thickness of 0.55 mm (%) 0.36 0.37 0.38 0.37 0.23 0.38 0.36 Grain Size (nm) 50 45 45 45 40 50 50 Thermal Refractive Index 1.4 1.2 1.4 1.5 1.4 1.3 1.4 Coefficient (10.sup.6/ C.) Crystallinity 0.8 0.82 0.81 0.82 0.84 0.82 0.83 Refractive Index (nd) 1.5392 1.5424 1.5433 1.5426 1.5444 1.5413 1.5414 Average Light Transmittance for 0.85 0.85 0.85 0.85 0.9 0.85 0.85 Thickness of 1 mm at 400-800 nm Light Transmittance for Thickness of 0.9 0.91 0.91 0.9 0.92 0.9 0.9 0.55 mm at Wavelength of 550 nm Predominant Crystalline Phase quartz quartz quartz quartz quartz quartz quartz crystalline crystalline crystalline crystalline crystalline crystalline crystalline phase, phase and phase and phase and phase and phase and phase and lithium lithium lithium lithium lithium lithium lithium disilicate disilicate disilicate disilicate disilicate disilicate disilicate and petalite First Temperature and 510 C.- 520 C.- 560 C.- 520 C.- 510 C.- 520 C.- 510 C.- Time for Crystallization 6 h 6 h 6 h 2 h 6 h 4 h 6 h Second Temperature and 690 C.- 710 C.- 715 C.- 720 C.- 710 C.- 715 C.- 720 C.- Time for Crystallization 2 h 6 h 4 h 2 h 6 h 4 h 2 h

[0143] The examples for the glass-ceramic article are shown in Tables 7-9 below.

TABLE-US-00007 TABLE 7 Components (wt %) 1 2 3 4 5 6 7 8 SiO.sub.2 75.5 75.5 75.3 74.6 74.2 79.0 78.5 76.5 Al.sub.2O.sub.3 8.5 7.6 8.5 9.5 9.8 7.0 8.0 8.0 Li.sub.2O 9.5 9.6 10.0 9.5 9.3 9.0 8.0 10.0 K.sub.2O 1.0 1.0 0.5 1.0 1.0 0.8 1.0 0.6 ZnO 0.7 0.5 0.5 1.0 0.6 0.0 0.4 0.5 MgO 1.0 1.0 1.0 0.9 1.0 1.0 1.0 1.0 P.sub.2O.sub.5 1.8 1.9 2.0 1.5 1.7 1.2 1.1 1.4 ZrO.sub.2 2.0 2.4 2.2 2.0 2.0 2.0 2.0 2.0 Sb.sub.2O.sub.3 0.0 0.5 0.0 0.0 0.3 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2O.sub.3 10.00 11.20 10.04 8.85 8.52 12.57 10.81 10.81 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 47.22 44.79 42.65 56.07 49.12 73.33 78.64 61.79 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 10.00 9.05 9.25 12.67 11.24 13.33 14.55 12.86 (SiO.sub.2 + Al.sub.2O.sub.3 + Li.sub.2O + ZrO.sub.2)/P.sub.2O.sub.5 53.06 50.05 48.00 63.73 56.06 80.83 87.73 68.93 (MgO + K.sub.2O)/ZrO.sub.2 1.00 0.83 0.68 0.95 1.00 0.90 1.00 0.80 Li.sub.2O/(K.sub.2O + ZrO.sub.2) 3.17 2.82 3.70 3.17 3.10 3.21 2.67 3.85 Haze for Thickness of 0.55 mm (%) 0.25 0.34 0.44 0.20 0.35 0.39 0.4 0.42 Grain Size (nm) 40 40 45 40 40 50 45 45 Thermal Refractive Index 1.4 1.5 0.8 1.4 1.4 1.1 0.9 0.8 Coefficient (10.sup.6/ C.) Crystallinity 0.81 0.82 0.7 0.8 0.82 0.77 0.75 0.74 Refractive Index (nd) 1.5415 1.5406 1.5359 1.5433 1.5419 1.5389 1.5342 1.5377 Average Light Transmittance for 0.87 0.86 0.85 0.88 0.88 0.85 0.85 0.85 Thickness of 1 mm at 400-800 nm Light Transmittance for Thickness 0.92 0.91 0.88 0.92 0.92 0.88 0.9 0.89 of 0.55 mm at Wavelength of 550 nm Predominant Crystalline Phase quartz quartz quartz quartz quartz quartz quartz quartz crystalline crystalline crystalline crystalline crystalline crystalline crystalline crystalline phase and phase and phase and phase and phase, phase and phase and phase and lithium lithium lithium lithium lithium lithium lithium lithium disilicate disilicate disilicate disilicate disilicate disilicate disilicate disilicate and petalite Surface Stress (MPa) 379 380 287 369 363 351 300 298 Four-Point Bending Strength (MPa) 750 752 685 739 742 701 698 677 Depth of Ion Exchange Layer (m) 94 85 75 88 90 80 78 79 Falling ball Height (mm) 1450 1400 1150 1250 1400 1250 1200 1200 Fracture Toughness (MPa .Math. m.sup.1/2) 2.1 2 1.3 1.7 1.6 1.5 1.2 1.3

TABLE-US-00008 TABLE 8 Components (wt %) 9 10 11 12 13 14 15 16 SiO.sub.2 72.0 71.9 73.0 73.5 76.0 74.0 74.5 74.5 Al.sub.2O.sub.3 9.5 9.0 8.0 7.8 6.9 7.9 7.8 9.5 Li.sub.2O 10.0 10.0 9.9 10.0 9.6 10.0 9.7 9.0 K.sub.2O 0.5 1.0 1.0 1.0 1.0 0.6 1.1 0.9 ZnO 1.0 2.5 2.3 2.3 0.8 1.2 1.3 0.9 MgO 2.0 1.0 1.5 1.0 1.0 1.5 1.0 1.0 P.sub.2O.sub.5 1.8 1.9 1.8 1.9 2.0 2.0 1.9 1.8 ZrO.sub.2 3.0 2.2 2.5 2.2 2.2 2.5 2.2 2.2 Sb.sub.2O.sub.3 0.2 0.0 0.0 0.3 0.5 0.3 0.3 0.2 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2O.sub.3 8.63 9.10 10.36 10.71 12.41 10.63 10.79 8.79 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 45.56 43.11 46.06 43.95 42.80 42.00 44.32 46.39 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 10.83 10.00 9.94 9.37 8.25 8.95 9.21 10.28 (SiO.sub.2 + Al.sub.2O.sub.3 + Li.sub.2O + ZrO.sub.2)/P.sub.2O.sub.5 52.50 49.00 51.89 49.21 47.35 47.20 49.58 52.89 (MgO + K.sub.2O)/ZrO.sub.2 0.83 0.91 1.00 0.91 0.91 0.84 0.95 0.86 Li.sub.2O/(K.sub.2O + ZrO.sub.2) 2.86 3.13 2.83 3.13 3.00 3.23 2.94 2.90 Haze for Thickness of 0.55 mm (%) 0.35 0.36 0.24 0.35 0.38 0.38 0.39 0.26 Grain Size (nm) 40 40 40 40 50 45 45 40 Thermal Refractive Index 1.4 1.3 1.4 1.2 1.1 1.5 1.4 1.3 Coefficient (10.sup.6/ C.) Crystallinity 0.83 0.8 0.83 0.81 0.78 0.82 0.81 0.83 Refractive Index (nd) 1.5443 1.542 1.5439 1.5411 1.5335 1.5346 1.5432 1.544 Average Light Transmittance for 0.87 0.87 0.88 0.87 0.85 0.85 0.85 0.88 Thickness of 1 mm at 400-800 nm Light Transmittance for Thickness 0.92 0.9 0.92 0.9 0.89 0.9 0.89 0.92 of 0.55 mm at Wavelength of 550 nm Predominant Crystalline Phase quartz quartz quartz quartz quartz quartz quartz quartz crystalline crystalline crystalline crystalline crystalline crystalline crystalline crystalline phase and phase and phase and phase and phase and phase and phase and phase and lithium lithium lithium lithium lithium lithium lithium lithium disilicate disilicate disilicate disilicate disilicate disilicate disilicate disilicate Surface Stress (MPa) 378 372 374 355 358 360 359 375 Four-Point Bending Strength (MPa) 745 742 746 725 726 728 730 735 Depth of Ion Exchange Layer (m) 85 86 92 92 85 81 82 93 Falling-ball Height (mm) 1300 1300 1350 1350 1300 1350 1500 1550 Fracture Toughness (MPa .Math. m.sup.1/2) 2 2.1 2 1.9 1.7 1.9 1.8 1.6

TABLE-US-00009 TABLE 9 Components (wt %) 17 18 19 20 21 22 23 SiO.sub.2 74.9 72.5 72.7 75.9 75.8 75.7 75.5 Al.sub.2O.sub.3 8.5 7.5 9.5 7.0 7.3 7.5 7.8 Li.sub.2O 10.0 12.0 9.5 9.9 9.8 9.7 9.6 K.sub.2O 1.0 1.5 1.0 1.0 1.0 1.0 1.0 ZnO 0.2 1.7 1.9 0.9 0.8 0.8 0.8 MgO 1.0 0.5 1.0 1.0 1.0 1.0 1.0 P.sub.2O.sub.5 2.0 1.9 1.9 1.9 1.9 1.9 1.9 ZrO.sub.2 2.2 2.2 2.0 2.2 2.2 2.2 2.2 Sb.sub.2O.sub.3 0.2 0.2 0.5 0.2 0.2 0.2 0.2 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Na.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 (SiO.sub.2 + Li.sub.2O)/Al.sub.2 O.sub.3 9.99 11.27 8.65 12.26 11.73 11.39 10.91 (SiO.sub.2 + Li.sub.2O)/P.sub.2O.sub.5 42.45 44.47 43.26 45.16 45.05 44.95 44.79 (Al.sub.2O.sub.3 + Li.sub.2O)/P.sub.2O.sub.5 9.25 10.26 10.00 8.89 9.00 9.05 9.16 (SiO.sub.2 + Al.sub.2O.sub.3 + Li.sub.2O + ZrO.sub.2)/P.sub.2O.sub.5 47.80 49.58 49.32 50.00 50.05 50.05 50.05 (MgO + K.sub.2O)/ZrO.sub.2 0.91 0.91 1.00 0.91 0.91 0.91 0.91 Li.sub.2O/(K.sub.2O + ZrO.sub.2) 3.13 3.24 3.17 3.09 3.06 3.03 3.00 Haze for Thickness of 0.55 mm (%) 0.36 0.37 0.38 0.37 0.23 0.38 0.36 Grain Size (nm) 50 45 45 45 40 50 50 Thermal Refractive Index 1.4 1.2 1.4 1.5 1.4 1.3 1.4 Coefficient (10.sup.6/ C.) Crystallinity 0.8 0.82 0.81 0.82 0.84 0.82 0.83 Refractive Index (nd) 1.5392 1.5424 1.5433 1.5426 1.5444 1.5413 1.5414 Average Light Transmittance for 0.85 0.85 0.85 0.85 0.89 0.85 0.85 Thickness of 1 mm at 400-800 nm Light Transmittance for Thickness of 0.9 0.91 0.91 0.9 0.92 0.9 0.9 0.55 mm at Wavelength of 550 nm Predominant Crystalline Phase quartz quartz quartz quartz quartz quartz quartz crystalline crystalline crystalline crystalline crystalline crystalline crystalline phase, phase and phase and phase and phase and phase and phase and lithium lithium lithium lithium lithium lithium lithium disilicate disilicate disilicate disilicate disilicate disilicate disilicate and petalite Surface Stress (MPa) 355 370 373 363 364 368 367 Four-Point Bending Strength (MPa) 731 739 738 728 724 721 720 Depth of Ion Exchange Layer (m) 89 89 89 89 95 88 86 Falling ball Height (mm) 1300 1200 1500 1300 1500 1450 1500 Fracture Toughness (MPa .Math. m.sup.1/2) 1.9 2.1 1.8 1.9 1.6 1.7 1.6