Low-phosphorus alkali-free glass easy for melting and reduced-pressure fining and suitable for float molding

Abstract

The invention relates to low-phosphorus alkali-free glass easy for melting and reduced-pressure fining and suitable for float molding. The glass is characterized by being prepared from the following raw materials in mole percent: 63.5-64 mol% of SiO2, 2-3 mol% of GeO2, 0.1-0.2 mol% of P2O5, 11-12 mol% of Al2O3, 0.1-0.4 mol% of ZrO2, 5-6 mol% of B2O3, 3-4 mol% of MgO, 4.5-5 mol% of CaO, 4-4.5 mol% of SrO, 2.9-3.6 mol% of BaO, 0.1-0.5 mol% of SrF2, and 0.1-0.5 mol% of CaCl2. The invention has the following beneficial effects: the melting temperature of the glass is reduced from 1638-1665 DEG C to less than 1638 DEG C; the surface tension is reduced from 330-350mN / m to 310-328mN / m, so that the glass is easier to melt at low temperature and fined under reduced pressure; the heat stability of the glass is also improved while the glass meets the use requirements of electronic information display, and the heat shrinkage rate is reduced from 3.8-3.9 ppm to 2.8-3.2 ppm; and the prepared glass can be applied to the fields of electronic information display, high-end touch and the like.

Description

technical field [0001] The invention relates to the field of glass manufacturing, and relates to a low-phosphorus alkali-free glass suitable for float forming that is easy to melt and easy to decompress and clarify. Background technique [0002] At present, alkali-free silicate glass such as TFT-LCD, LTPS-LCD and other substrate glasses is mainly alkali-free aluminosilicate glass, because the formula contains more alumina (10-13 mol. %) and calcium oxide (4-5mol.%), under the same temperature conditions, the surface tension of the glass is large (about 20% larger than that of ordinary soda-lime glass), which makes the alkali-free aluminosilicate glass show the characteristic of high viscosity. [0003] The float method uses gravity to spread the molten glass on the horizontal surface and cool it, but the viscosity of the alkali-free aluminosilicate glass is high (10Pa·s corresponds to a melting temperature of 1650-1680°C), and it is affected by surface tension and has poor l...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of difficulty and high cost in industrial production of the low-phosphorus alkali-free glass batch material suitable for float forming described in the patent publication No. CN108483900A, and to provide a kind of melting, Low-phosphorus alkali-free glass suitable for float forming clarified under reduced pressure

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