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Alkali-free silicate glass with low expansion coefficient and high strain point

A low-expansion coefficient, silicate glass technology, used in the field of substrate glass to ensure stability and increase chemical stability

Inactive Publication Date: 2018-12-07
IRICO DISPLAY DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, most substrate glass products can meet the above one or two conditions, but it is difficult to make the performance of the substrate glass meet all the above requirements. For example, the density of most substrate glass is about 2.3-2.7g / cm 3 range, but its strain point is in the range of 600-685°C, and the coefficient of thermal expansion in the range of 0-300°C is 35-55×10 -7 In the range of / °C, if it is tested in the range of 30-380°C, the thermal expansion coefficient will be higher

Method used

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  • Alkali-free silicate glass with low expansion coefficient and high strain point
  • Alkali-free silicate glass with low expansion coefficient and high strain point
  • Alkali-free silicate glass with low expansion coefficient and high strain point

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Embodiment 1

[0033] 1. Pour the mixed raw material powder into a platinum crucible, keep it warm at 1630°C for 4 hours, and pour the melted glass liquid into a preheated mold for molding.

[0034] 2. Put the formed block glass into the annealing furnace, the annealing temperature is 730°C, and the annealing time is 45min;

[0035] The composition of the glass prepared under this preparation parameter is: SiO 2 : 62%; Al 2 o 3 : 19.4%; B 2 o 3 : 4.57%; MgO: 2.62%; CaO: 7.1%; SrO: 3.5%; BaO: 0.6%; SnO 2 : 0.21%; The physical parameters of the glass prepared according to this composition are as follows: Density 2.47g / cm 3 ;Thermal expansion coefficient: 36.77×10 -7 / °C; strain point 715°C; chemical corrosion resistance / mass loss, HCl 5%-95°C-24h: 0.25mg / cm 2 ;NH4F: HF-10%-20℃-20min: 1.14mg / cm 2 ;HF-10%-20℃-20min: 5.1mg / cm 2 ;NaOH-95℃-6h: 1.43mg / cm 2 .

[0036] Table 1 is remaining embodiment in the present invention, (table 1-1 is embodiment 2-5, and table 1-2 is embodiment 6-10) c...

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Abstract

The invention discloses alkali-free silicate glass with a low expansion coefficient and a high strain point. The chemical compositions of each oxide of the glass are limited; the main composition SiO2is limited to a certain range, so that the strain point of the glass is increased, and the chemical stability of the glass such as acid resistance is ensured; and the total mass percentage of the SiO2 and Al2O3 is limited, so that the strain point and elastic modulus of the glass are increased, and the chemical stability of the glass is improved. The glass compositions basically do not contain alkali metal oxides, so that the stability of the gate voltage of a thin film transistor is ensured; the density of the glass containing the chemical compositions is lower than 2.6g / cm<3>, and the thermal expansion coefficient is less than or equal to 50*10<7> / DEG C, the strain point of the glass is greater than or equal to 695 DEG C; and the physical property parameters of the glass in the composition range can satisfy the composition requirements of the base glass.

Description

【Technical field】 [0001] The invention belongs to the field of substrate glass, in particular to an alkali-free silicate glass with a low expansion coefficient and a high strain point. 【Background technique】 [0002] In recent years, with the increasing demand for thin-film transistor liquid crystal displays (TFT-LCD), my country, as a big consumer of TFT-LCD, has paid more and more attention to the production of substrate glass used in TFT-LCD. Substrate glass can be used in electronic devices such as LCD TVs, LCD monitors, notebook computers, tablet computers, and mobile phones. As the cornerstone of the thin film display industry, substrate glass is not only widely used in TN / STN, TFT and other liquid crystal panel structures, but also essential for OLEDs. The importance of the substrate glass is limited by the change of the display mechanism and is irreplaceable. It will have a stable position in the industry in the future. Therefore, the quality requirements of the subs...

Claims

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Application Information

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IPC IPC(8): C03C3/091C03C4/00
CPCC03C3/091C03C4/00
Inventor 兰静王答成曾召
Owner IRICO DISPLAY DEVICES