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. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein a crystallinity is 70% or more.ġ0.
#G FORCE PLATINUM 3.8.5 CRACK FREE#
The glass-ceramic article for the electronic device cover plate according to claim 1, comprising in weight percent Li 2O 8%-less than 10%, free of SrO, free of BaO, free of TiO 2, free of Y 2O 3, free of GeO 2, free of CaO, free of Cs 2O, free of PbO, free of As 2O 3, free of La 2O 3 and free of Tb 2O 3.ĩ. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (K 2O+MgO)/ZrO 2 is 0.8-1.0, or Li 2O/(K 2O+ZrO 2) is 2.8-3.3.Ĩ. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (Al 2O 3+Li 2O)/P 2O 5 is 8.5-14 (SiO 2+Li 2O)/P 2O 5 is 45-60, (SiO 2+Al 2O 3+Li 2O+ZrO 2)/P 2O 5 is 48-80, or (SiO 2+Li 2O)/Al 2O 3 is 8.5-12.ħ. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (SiO 2+Li 2O)/Al 2O 3 is 8-13, (SiO 2+Li 2O)/P 2O 5 is 40-70, (SiO 2+Al 2O 3+Li 2O+ZrO 2)/P 2O 5 is 45-85, (K 2O+MgO)/ZrO 2 is 0.7-1.1, or Li 2O/(K 2O+ZrO 2) is 2.8-3.5.ĥ. The glass-ceramic article for the electronic device cover plate according to claim 1, wherein (SiO 2+Li 2O)/Al 2O 3 is 6-15, (SiO 2+Li 2O)/P 2O 5 is 40-80, (K 2O+MgO)/ZrO 2 is 0.6-1.2, or Li 2O/(K 2O+ZrO 2) is 2.8-4.0.Ĥ. 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 2O 3: 0-5%, and a fining agent: 0-2%.ģ. 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 2O 3: 1-15%, Li 2O: 5-15%, ZrO 2: 0.1-10%, P 2O 5: 0.79-2.5%, K 2O: 0-10%, MgO: 0.3-10%, ZnO: 0-10%, free of Na 2O, and free of B 2O 3, wherein (SiO 2+Al 2O 3+Li 2O+ZrO 2)/P 2O 5 is 40-90, (Al 2O 3+Li 2O)/P 2O 5 is 8.5-20, and 2.67