Glass Composition Balancing Deflection Control and Devitrification
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Solution Overview
Problem
Conventional glasses with high Young's modulus and low thermal expansion coefficients are difficult to manufacture due to crystallization and devitrification, making them challenging to produce while suppressing deflection.
Innovation Solution
A glass composition with a Young's modulus of 95 GPa or more and a coefficient of linear thermal expansion of 5.5 ppm/°C or less, combined with a devitrification suppression parameter value A of 6.0 or more, achieved through specific oxide content and composition adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass composition is adjusted to achieve high Young's modulus and low thermal expansion coefficient, then deflection is suppressed, but crystallization and devitrification occur making manufacturing difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the glass, specifically setting SiO2 content at 70-77 mol%, Al2O3 at 3-10 mol%, and adding specific amounts of B2O3 (0.1-5 mol%) and ZnO (0.1-5 mol%). By adjusting these compositional parameters within defined ranges, the glass achieves both high Young's modulus (100-150 GPa) and low thermal expansion coefficient (3.0-5.5 ppm/°C) while maintaining manufacturability through controlled devitrification resistance
Solution Approach 2:
The patent employs composite material principles by creating a multi-component glass system that combines SiO2 as the base glass former with Al2O3 as a network modifier, and B2O3 and ZnO as additional modifiers. This composite composition synergistically achieves the desired mechanical properties (high Young's modulus) and thermal properties (low thermal expansion) while the specific combination prevents excessive crystallization during manufacturing
Data Source
AI summary
Manufacturing can be facilitated while deflection is suppressed. A glass (10) has a Young's modulus of 95 GPa or more, a coefficient of linear thermal expansion of 5.5 ppm/° C. or less, and a devitrification suppression parameter value represented by Formula (1) of 6.0 or more.