Lithium aluminum silicate glass ceramics

JP2025536816A5Pending Publication Date: 2026-06-16SCHOTT AG

Patent Information

Authority / Receiving Office: JP · JP
Patent Type: Applications
Current Assignee / Owner: SCHOTT AG
Filing Date: 2023-09-15
Publication Date: 2026-06-16

AI Technical Summary

Technical Problem

Existing lithium aluminum silicate glass-ceramics for cooktops face challenges in achieving good melting properties and thermal shock resistance while minimizing lithium content due to rising lithium prices, leading to economic and performance issues.

Method used

A lithium aluminum silicate glass ceramic composition with specific ranges of SiO2, Al2O3, Li2O, and other components, including MgO, ZnO, and BaO, is developed to achieve a thermal expansion coefficient of -0.5 to 1.9 ppm/K, ensuring high thermal shock resistance and long-term thermal stability, with optimized melting properties and reduced lithium content.

Benefits of technology

The solution provides glass-ceramics suitable for various heating elements with improved thermal shock resistance, long-term heat resistance, and economic viability by minimizing lithium usage without compromising on processing and thermal stability.

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Abstract

The present invention relates to lithium aluminum silicate glass ceramics having a thermal expansion coefficient of -0.5 to 1.9 ppm / K in the range of 20 to 700°C, and uses thereof. The glass ceramics contain the following components in the indicated amounts, in weight percent on an oxide basis: SiO2 60 to 70, Al2O3 17 to 25, Li2O 2.0 to <3.2, MgO 0 to <0.5, ZnO 1.5 to <3, BaO 0.2 to 3, Na2O >0.05 to <0.6, K2O >0.05 to <0.5, Sn2O 0.1 to <1.0, and a composition containing SiO2 60 to 70, Al2O ...

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