Ultrathin aluminosilicate glass as well as preparation method and application thereof

Abstract

The invention belongs to the field of preparation of aluminosilicate glass, and particularly relates to ultrathin aluminosilicate glass and a preparation method thereof. The ultrathin aluminosilicateglass is prepared from the following raw materials: 55-70% of SiO2, 5-21% of Al2O3, 2-8% of MgO, 8-17% of Na2O, 0.1-3% of K2O+Li2O, 0.1-2% of ZrO2, 0.1-6% of P2O5 and 0.05-1% of a clarifying agent. The thickness of the ultra-thin aluminosilicate glass is less than 0.5 mm, and preferably, the thickness of the ultra-thin aluminosilicate glass is less than 0.1 mm. By adjusting the composition of theglass, the prepared glass has enough stress layer depth and surface pressure stress value on the premise of no spontaneous explosion, so the flexibility of the glass is improved, and the bending radius of the glass is reduced. The ultrathin aluminosilicate glass disclosed by the invention can be well applied to the fields of flexible electronic display equipment, foldable screen equipment, wearable display equipment and the like, and has a very far-reaching influence on the development of the field of displays.

Description

technical field [0001] The invention belongs to the field of aluminosilicate glass preparation, and in particular relates to a chemically toughened ultra-thin aluminosilicate glass and its preparation method and application. Background technique [0002] The development and utilization of electronic equipment continues to deepen, putting forward higher requirements for electronic equipment, and thinner and lighter have become the mainstream. In recent years, with the emergence of foldable mobile phones and wearable flexible display devices, protection glass for electronic screens Requirements have been further improved. At present, the display screens of folding screen mobile phones and flexible devices on the market mainly use resin materials as cover plates. Compared with screens with glass material as cover plates, screens made of resin materials are easier to scratch and damage. damage, so the concept of flexible glass was proposed, which not only has the advantages of g...

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Problems solved by technology

[0004] In the existing technology, in order to improve the strength of glass, high-alumina glass is often used to prepare ultra-thin glass, which makes the surface tension stress of chemically toughened flexible glass very high, which leads to the tempering degree of flexible glass can only be controlled at Below 30μm, the depth of the stress layer is small, which reduces the glass surface performance of the glass, and the screen made is easy to be scratched and damaged, and the smaller the stress layer, the lower the bendability of the glass and the larger the bending radius

At present, the ultra-thin cover glass produced on the market is composed of high alumina, and the content of alumina in it is ≥13wt%, which can greatly increase the speed and depth of ion exchange during chemical tempering, thereby increasing the surface compressive stress (CS ) and depth of stress layer (DoL), but the viscosity of high alumina glass is high, the sintering temperature is high, and its melting temperature (T 2 )≥1650℃, working temperature (T 4 ) ≥ 1250°C, which is not conducive to the clarification and homogenization of glass liquid, and it is difficult to thin and form, so that the yield rate is not high, which greatly increases the production cost

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