An alkali-free glass substrate and its preparation method

By using B2O3/C composite microparticles as a clarifying agent in alkali-free glass substrates, the problem of small bubbles being difficult to remove at high temperatures is solved, resulting in higher clarification effect and mechanical strength, thus improving the quality of the glass substrates and making them suitable for the preparation of TFT-LCD glass substrates.

CN118239676BActive Publication Date: 2026-06-30湖南邵虹特种玻璃股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
湖南邵虹特种玻璃股份有限公司
Filing Date
2024-04-10
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing alkali-free glass substrates are difficult to effectively remove small bubbles at high temperatures, which affects the quality improvement of TFT-LCD glass substrates. Commonly used clarifying agents pose environmental pollution risks and have insufficient performance.

Method used

B2O3/C composite microparticles are used as a clarifying agent. Uniform and dense micron-sized microparticles are formed by laser irradiation and stirring. Boron nitride and carbon dioxide gas are generated at high temperature and used for clarifying alkali-free glass melt. Alkali-free glass substrates are prepared by overflow forming.

Benefits of technology

It significantly improves the clarification effect of alkali-free glass substrates, reduces the coefficient of thermal expansion, increases Young's modulus and specific modulus, and enhances the ability to manufacture thin and light liquid crystal displays, while avoiding the generation of harmful gases and improving the quality of glass substrates.

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Abstract

This invention belongs to the field of glass substrate technology, specifically relating to an alkali-free glass substrate and its preparation method, comprising the following raw materials: SiO2, Al2O3, MgO, CaO, BaO, SrO, and B2O3 / C composite microparticles. B2O3 and C are dispersed by laser irradiation ablation combined with microwave and stirring to form uniform and dense nanoparticles. The B2O3 / C composite microparticles significantly improve the clarification effect and reduce the coefficient of thermal expansion. This not only reduces shrinkage deformation during molding but also suppresses flexural deformation during subsequent processing, and increases Young's modulus and specific modulus, which is beneficial for manufacturing thinner and lighter liquid crystal displays. Furthermore, the B2O3 / C composite microparticles coated with silica provide better clarification with a lower content, resulting in an alkali-free glass substrate with a lower coefficient of thermal expansion and higher Young's modulus and specific modulus.
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