Aluminosilicate Glass for Complex Shapes and Durability
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Solution Overview
Problem
The challenge lies in developing glass compositions that are both mechanically durable and capable of being formed into complex 3-dimensional shapes, while also maintaining low characteristic temperatures to prevent damage from accidental drops on hard surfaces in portable devices.
Innovation Solution
A glass composition with a specific balance of SiO2, Al2O3, MgO, Li2O, Na2O, and other oxides, which allows for high surface compressive stress and low characteristic temperatures, enabling ion-exchangeability and formability into complex shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass compositions are made mechanically durable with high characteristic temperatures, then strength and damage resistance are improved, but the ability to form complex 3-dimensional shapes deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the glass, specifically controlling the ranges of SiO2 (55-70 mol%), Al2O3 (14-25 mol%), and alkali metal oxides (Li2O 0-10 mol%, Na2O 6.5-20 mol%, K2O 0-5 mol%). These parameter changes create a composition that achieves both high mechanical durability and low characteristic temperatures for ease of forming complex shapes
2Reliability
If glass compositions are made with high characteristic temperatures for durability, then resistance to thermal damage is improved, but the softening point and processing temperature increase
Solution Approach 1:
The patent achieves low softening points (below 850°C) while maintaining high mechanical durability by carefully balancing the oxide composition parameters. The specific ranges of Al2O3 (14-25 mol%) combined with controlled alkali metal oxide content create a glass structure that processes easily at low temperatures but exhibits high strength and damage resistance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The glass composition achieves enhanced mechanical durability and ion-exchangeable properties, providing improved resistance to damage and flexibility in forming complex shapes for electronic device cover glasses.
Implementation Method 1
ion-exchangeable alkali aluminosilicate glass compositions having improved mechanical durability and low characteristic temperatures
Data Source
AI summary
A glass composition includes: greater than or equal to 55 mol % and less than or equal to 70 mol % SiO2; greater than or equal to 14 mol % and less than or equal to 25 mol % Al2O3; greater than or equal to 0 mol % B2O3; greater than or equal to 0 mol % P2O5; greater than or equal to 0 mol % and less than or equal to 10 mol % Li2O; greater than or equal to 6.5 mol % and less than or equal to 20 mol % Na2O; greater than or equal to 0 mol % K2O; greater than or equal to 0.1 mol % and less than or equal to 4.5 mol % MgO; greater than or equal to 0 mol % CaO; and greater than or equal to 0 mol % SrO. The sum of Li2O, Na2O, and K2O in the glass composition may be greater than or equal to 6.5 mol % and less than or equal to 22 mol %. The glass composition may satisfy the relationship Al2O3*(2.94)+B2O3*(−0.58)+P2O5*(−3.87)+Li2O*(5.01)+Na2O*(1.89)+K2O*(−2.03) is greater than 100.