High-strength transparent glass ceramic

Abstract

The invention belongs to the technical field of glass ceramic materials, and concretely relates to a high-strength transparent glass ceramic. The glass ceramic comprises, by mass, 65-73% of SiO2, 3-10% of Al2O3, 1.5-4% of Na2O, 10-14% of Li2O, 1.5-4% of P2O5, 1.5-5% of Zr2O and 0-1% of a clarifier, a ratio of (Al2O3+ZrO2) to P2O5 is equal to or more than 2 and equal to or less than 6; and a ratioof P2O5 to (Na2O + K2O) is more than -0.5 and less than 0.5, and the crystal phase of the high-strength transparent glass ceramic contains Li2Si2O5 or LiAlSi4O10. The glass ceramic of the present invention has a transmittance of at least 88% and the surface Vickers hardness after reinforcement is at least 750 kgf / mm<2>.

Description

technical field [0001] The invention belongs to the technical field of glass-ceramic materials, in particular, relates to a high-strength transparent glass-ceramics, and more specifically, relates to a Li- 2 Si 2 o 5 Crystalline high-strength transparent glass-ceramics. Background technique [0002] After aluminosilicate glass is ion-strengthened, a layer of high surface compressive stress (Compressive Stress, referred to as CS) and a certain depth of ion-strengthened layer (Depth of Layer, referred to as DOL) are formed on the surface of the glass, thereby rapidly improving the surface of the glass. Hardness, impact resistance, scratch resistance and damage resistance, so it is widely used in the cover protection material of touch display products. With the advent of the 5G communication era and the gradual maturity of wireless charging technology, the back cover made of metal materials is bound to be eliminated, and glass and ceramic materials among non-metal materials ...

AI Technical Summary

Problems solved by technology

Patent CN104108883A provides a high-strength lithium disilicate glass ceramic and its preparation method, but the composition contains zirconia and magnesium aluminum silicate crystal phase, it is difficult to obtain glass ceramics with high transmittance

Patent CN1052271762A provides a composition for preparing lithium disilicate glass-ceramics, but there is no Na in the composition 2 In the presence of O components, high surface stress cannot be formed by ion strengthening

Patent CN107845078A provides glass-ceramics and substrates containing lithium disilicate, but Al 2 o 3 、Na 2 If the O content is too high, although ion strengthening can be used to achieve high surface strength, uniformly precipitated glass-ceramics cannot be obtained during the microcrystallization process, resulting in a decrease in glass transmittance and strength.

Patent CN107001120A patent provides high-strength glass-ceramics with lithium permeable feldspar and lithium silicate structure, but Na 2 O content is too low, it is difficult to quickly obtain glass ceramics with high surface strength, and part of the composition in the patent is opaque after microcrystallization treatment

Images