Glass-ceramic article and glass-ceramic for electronic device cover plate
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 2 : 65-85%, Al 2 O 3 : 1-15%, Li 2 O: 5-15%, ZrO 2 : 0.1-10%, P 2 O 5 : 0.1-10%, K 2 O: 0-10%, MgO: 0-10%, ZnO: 0-10%, and Na 2 O: 0-5%, wherein (SiO 2 +Al 2 O 3 +Li 2 O+ZrO 2 )/P 2 O 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.
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 2 : 65-85%, Al 2 O 3 : 1-15%, Li 2 O: 5-15%, ZrO 2 : 0.1-10%, K 2 O: 0-10%,
MgO: 0-10%, ZnO: 0-10%, Na 2 O: 0-5%, and P 2 O 5 being greater than 0.79% and less than 2.5%,
wherein (SiO 2 +Al 2 O 3 +Li 2 O+ZrO 2 )/P 2 O 5 is 40-90, (Al 2 O 3 +Li 2 O)/P 2 O 5 is 8.5-20, and (K 2 O+MgO)/ZrO 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 150×57×0.55 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 2 : 0-5%, Y 2 O 3 : 0-5%, B 2 O 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 2 +Li 2 O)/Al 2 O 3 is 6-15, (SiO 2 +Li 2 O)/P 2 O 5 is 40-80, or Li 2 O/(K 2 O+ZrO 2 ) is 2.3-4.0.
4. The glass-ceramic article for the electronic device cover plate according to claim 1 , wherein (SiO 2 +Li 2 O)/Al 2 O 3 is 8-13, (SiO 2 +Li 2 O)/P 2 O 5 is 40-70, (SiO 2 +Al 2 O 3 +Li 2 O+ZrO 2 )/P 2 O 5 is 45-85, (K 2 O+MgO)/ZrO 2 is 0.7-1.1, or Li 2 O/(K 2 O+ZrO 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 2 : 70-76%, Al 2 O 3 : 4-10%, Li 2 O: 8-12.5%, ZrO 2 : 1-5%, P 2 O 5 : 1-2.42%, K 2 O: 0-3%, MgO: 0.3-2%, ZnO: 0-3%, Na 2 O: 0-1%, Sb 2 O 3 : 0-1%, SnO 2 : 0-1%, SnO: 0-1%, or CeO 2 : 0-1%.
6. The glass-ceramic article for the electronic device cover plate according to claim 1 , wherein (Al 2 O 3 +Li 2 O)/P 2 O 5 is 8.5-14; (SiO 2 +Li 2 O)/P 2 O 5 is 45-60, (SiO 2 +Al 2 O 3 +Li 2 O+ZrO 2 )/P 2 O 5 is 48-80, or (SiO 2 +Li 2 O)/Al 2 O 3 is 8.5-12.
7. The glass-ceramic article for the electronic device cover plate according to claim 1 , wherein (K 2 O+MgO)/ZrO 2 is 0.8-1.0, or Li 2 O/(K 2 O+ZrO 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 2 O 8%-less than 10%, free of SrO, free of BaO, free of TiO 2 , free of Y 2 O 3 , free of GeO 2 , free of CaO, free of Cs 2 O, free of PbO, free of B 2 O 3 , free of As 2 O 3 , free of La 2 O 3 and free of Tb 2 O 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 −0.8×10 −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 2 : 65-85%, Al 2 O 3 : 1-15%, Li 2 O: 5-15%, ZrO 2 : 0.1-10%, K 2 O: 0-10%, MgO: 0-10%, ZnO: 0-10%, Na 2 O: 0-3%, Sb 2 O 3 : 0-1%, SnO 2 : 0-1%, SnO: 0-1%, CeO 2 : 0-1%, and P 2 O 5 being greater than 0.79% and less than 2.5%,
wherein (SiO 2 +Al 2 O 3 +Li 2 O+ZrO 2 )/P 2 O 5 is 40-90, (Al 2 O 3 +Li 2 O)/P 2 O 5 is 8.5-20 and (K 2 O+MgO)/ZrO 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 2 +Al 2 O 3 +Li 2 O+ZrO 2 )/P 2 O 5 is 45-85; (SiO 2 +Li 2 O)/Al 2 O 3 is 8-13; (Al 2 O 3 +Li 2 O)/P 2 O 5 is 8.5-14; (SiO 2 +Li 2 O)/P 2 O 5 is 40-70; or Li 2 O/(K 2 O+ZrO 2 ) is 2.5-3.5.
13. The glass-ceramic according to claim 11 , wherein SiO 2 : 70-76%, Al 2 O 3 : 4-10%, Li 2 O: 8-12.5%, ZrO 2 : 1-5%, P 2 O 5 : 1-2.42%, K 2 O: 0-3%, MgO: 0.3-2%, ZnO: 0-3%, and Na 2 O: 0-1%.
14. The glass-ceramic according to claim 11 , wherein (K 2 O+MgO)/ZrO 2 is 0.8-1.0, or Li 2 O/(K 2 O+ZrO 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 −0.8×10 −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 2 +Li 2 O)/P 2 O 5 ≤80.
22. The glass-ceramic according to claim 11 , wherein 43.35<(SiO 2 +Li 2 O)/P 2 O 5 ≤80.
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 2 O is 0.5-1.1%.
27. The glass-ceramic article for the electronic device cover plate according to claim 25 , wherein K 2 O is 0.5-1.1%.
28. The glass-ceramic article for the electronic device cover plate according to claim 1 , wherein (SiO 2 +Li 2 O)/Al 2 O 3 is 6-15, (SiO 2 +Li 2 O)/P 2 O 5 is 40-80, and Li 2 O/(K 2 O+ZrO 2 ) is 2.3-4.0.