Microcrystalline glass and chemically strengthened microcrystalline glass

Abstract

The invention provides microcrystalline glass and chemically strengthened microcrystalline glass obtained by chemically strengthening the microcrystalline glass. The microcrystalline glass is prepared from base material glass through a nucleation process and a crystallization process. The maximum value of tensile stress in a tensile stress layer formed inside the base material glass after chemical strengthening is CT1, the maximum value of tensile stress in a tensile stress layer formed inside the microcrystalline glass after chemical strengthening under the same condition is CT2, the depth of a pressure stress layer formed on the surface of the base material glass after chemical strengthening is DOL1, and the depth of a pressure stress layer formed on the surface of the microcrystalline glass after chemical strengthening under the same condition is DOL2, wherein CT2 / CT1 is in a range of 0.4 to 0.7 or DOL2 / DOL1 is in a range of 0.8 to 0.99. The crystallinity of the microcrystalline glass can balance the mechanical strength and the chemical strengthening performance of the microcrystalline glass, and the chemically strengthened microcrystalline glass with excellent scratch resistance, falling resistance and safety can be obtained after the microcrystalline glass is chemically strengthened.

Description

technical field [0001] The invention relates to the technical field of glass, in particular to the field of glass-ceramics, more specifically, to glass-ceramics and chemically strengthened glass-ceramics. Background technique [0002] On mobile phones, tablets and other mobile electronic devices with touch screen panels, alkali-aluminosilicate glass materials with high aluminum content are usually used as cover plates to protect the display screen. [0003] At present, in order to improve the anti-scratch and anti-drop properties of the glass cover plate, the glass is usually strengthened to prepare strengthened glass. Introducing surface compressive stress on the glass surface is a common method for strengthening glass. The method of introducing surface stress can be realized by physical or chemical methods, so it can be divided into physical strengthening method and chemical strengthening method. Among them, the chemical strengthening method is also called the ion exchan...

AI Technical Summary

Problems solved by technology

However, the existing glass-ceramics have the problem that during the crystallization process, the alkali metal ions that can be used for ion exchange will participate in the crystallization process.

When alkali metal ions are part of the crystal structure, it makes ion exchange slower and more difficult during the ion exchange process

Especially for glass-ceramics with a high degree of crystallization, too many alkali metal ions participate in the crystallization, resulting in a sharp decrease in its chemical strengthening performance, and it is difficult to obtain the scratch resistance and drop resistance of the glass cover obtained by chemical strengthening. Further improvement; or glass-ceramics with a lower degree of crystallization increases the alkali metal ions in the glass state, which is conducive to ion exchange, but less crystals will lead to a decrease in its own mechanical strength. Even if it is chemically strengthened, it is difficult to obtain drop resistance and Glass cover with sufficiently excellent surface scratch resistance

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