Alkali-free and high-alumina borosilicate glass with low thermal expansion coefficient and preparation method of alkali-free and high-alumina borosilicate glass

A low thermal expansion coefficient, silicate glass technology, applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve problems such as difficult removal of bubbles, high temperature viscosity, and difficulty in melting, so as to increase difficulty and cost Effect

Pending Publication Date: 2018-10-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to SiO 2 High content, in the melt [SiO 4 ] tetrahedron has a high degree of polymerization, and there are bound to be problems such as high viscosity at high temperature, difficulty in getting rid of bubbles, and difficulty in melting

Method used

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  • Alkali-free and high-alumina borosilicate glass with low thermal expansion coefficient and preparation method of alkali-free and high-alumina borosilicate glass
  • Alkali-free and high-alumina borosilicate glass with low thermal expansion coefficient and preparation method of alkali-free and high-alumina borosilicate glass
  • Alkali-free and high-alumina borosilicate glass with low thermal expansion coefficient and preparation method of alkali-free and high-alumina borosilicate glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A low thermal expansion coefficient alkali-free high-alumina borosilicate glass prepared in this example comprises the following oxides and is composed of: MgO: 12.37%, ZnO: 0.13%, Al 2 o 3 : 31.45%, SiO 2 : 52.83%, B 2 o 3 : 3.22%. Accurately weigh the corresponding raw materials, mix all the raw materials fully and put them into a platinum crucible, raise the temperature to 1650 °C at a heating rate of 5 °C / min in a well-sealed silicon-molybdenum rod resistance furnace, and keep it for 3 hours to obtain a uniform glass melt ; Then pour the glass melt into a preheated stainless steel mold for molding, anneal at 680°C for 10 hours, and cool to room temperature with the furnace, and finally obtain a colorless, transparent, uniform, and bubble-free bulk glass. figure 1 It is the DSC curve chart of the alkali-free high aluminum borosilicate glass material prepared in Example 1.

Embodiment 2

[0038] A low thermal expansion coefficient alkali-free high-alumina borosilicate glass prepared in this embodiment comprises the following oxides: MgO: 12.09%, ZnO: 0.63%, Al 2 o 3 : 31.38%, SiO 2 : 52.69%, B 2 o 3 : 3.21%. Accurately weigh the corresponding raw materials, mix all the raw materials fully and put them into a corundum crucible, raise the temperature to 1650°C at a heating rate of 5°C / min in a well-sealed molybdenum silicon rod resistance furnace, and keep it for 3 hours to obtain a uniform glass melt , and then pour the glass melt into a preheated stainless steel mold for molding, anneal at 680°C for 10 hours, and cool to room temperature with the furnace, and finally obtain a colorless, transparent, uniform, and bubble-free bulk glass.

Embodiment 3

[0040] A low thermal expansion coefficient alkali-free high-alumina borosilicate glass prepared in this embodiment comprises the following oxides and is composed of: MgO: 11.74%, ZnO: 1.25%, Al 2 o 3 : 31.28%, SiO 2 : 52.53%, B 2 o 3 : 3.20%. Accurately weigh the corresponding raw materials, mix all the raw materials fully and put them into a quartz crucible, raise the temperature to 1650 °C at a heating rate of 5 °C / min in a well-sealed silicon-molybdenum rod resistance furnace, and keep it for 2 hours to obtain a uniform glass melt , and then pour the glass melt into a preheated stainless steel mold for molding, anneal at 680°C for 10 hours, and cool to room temperature with the furnace, and finally obtain a colorless, transparent, uniform, and bubble-free bulk glass.

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Abstract

The invention discloses alkali-free and high-alumina borosilicate glass with a low thermal expansion coefficient and a preparation method of the alkali-free and high-alumina borosilicate glass. MgO ispartially replaced with high Al2O3, low SiO2 and ZnO, MgO, ZnO, Al2O3, SiO2 and borate are taken as raw materials, B2O3 is introduced by boric acid, zinc borate, magnesium borate or aluminum borate,the glass comprises oxides as follows: 5.85%-12.37% of MgO, 0.13%-11.81% of ZnO, 29.60%-31.45% of Al2O3, 49.71%-52.83% of SiO2 and 3.03%-3.22% of B2O3, and total mass of MgO and ZnO is 12.50%-17.66%.The preparation process is simple, the melting temperature is low, and the prepared glass has low density, low thermal expansion coefficient, low dielectric loss and moderate dielectric constant and is applied to a hybrid circuit substrate, an encapsulating material or a flat-panel display.

Description

technical field [0001] The invention relates to a low thermal expansion coefficient alkali-free high-alumina borosilicate glass and a preparation method thereof, in particular to a glass material with a low thermal expansion coefficient, low dielectric loss and dielectric constant and a preparation method thereof, belonging to the field of glass technology. technical background [0002] MgO-Al 2 o 3 -SiO 2 (MAS) system glass is a kind of glass with very important scientific research value and economic value because of its excellent thermal shock resistance, thermal stability, low thermal expansion coefficient, high strength and excellent dielectric properties. In addition to the excellent mechanical properties and chemical stability of ordinary oxide glasses, the MAS system glass also has unique optical properties, and its high strain point (≥700°C) is not available in other system glasses. People have always been very active in the research and development of MAS series ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/093C03B19/02C03B25/00
CPCC03B19/02C03B25/00C03C3/093
Inventor 卢安贤桂花罗志伟刘涛涌韩磊刘建磊李翠林昌伟吴佳琦
Owner CENT SOUTH UNIV
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