Foldable Glass Composition for Strength and Flexibility
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Solution Overview
Problem
Existing glass articles for foldable display devices lack the necessary combination of mechanical strength, flexibility, and impact resistance to withstand external shocks and bending stresses, particularly in thin configurations.
Innovation Solution
A glass composition with a novel composition ratio of SiO2 (48-57 mol%), Al2O3 (10-20 mol%), Na2O (8-18 mol%), K2O (0-10 mol%), B2O3 (10-17 mol%), and CaO or MgO (0-7 mol%), which satisfies the condition 0.7≤Al2O3/(Na2O+K2O)≤1.3, is used to produce glass articles with specific mechanical and thermal properties, including a thickness of 20-100 μm, a glass transition temperature of 510-610°C, and a modulus of elasticity of 60-70 GPa, enabling excellent mechanical strength and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the thickness of the glass article is reduced to make it thin and flexible, then the flexibility and bendability improve, but the mechanical strength and impact resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the glass, specifically setting SiO2 content to 40-70 mol%, Al2O3 to 5-20 mol%, B2O3 to 5-20 mol%, and controlling the ratio of (Na2O+K2O)/(CaO+MgO) to 0.5-2.0. These parameter changes enable the glass to achieve both flexibility and mechanical strength simultaneously by optimizing the network structure and modifier content.
Solution Approach 2:
The patent creates a composite glass material that combines multiple oxides with complementary functions: SiO2 forms the glass network providing strength, Al2O3 and B2O3 enhance chemical durability and mechanical properties, while Na2O, K2O, CaO, and MgO act as modifiers to control flexibility and processing characteristics. This composite composition achieves the desired balance between flexibility and strength.
2Adaptability or versatility
If the thickness of the glass article is reduced to relieve bending stress, then the bendability improves, but the impact resistance deteriorates
Solution Approach 1:
The patent optimizes composition parameters including SiO2 (40-70 mol%), Al2O3 (5-20 mol%), B2O3 (5-20 mol%), and the ratio (Na2O+K2O)/(CaO+MgO) (0.5-2.0) to achieve a glass structure that provides both bendability and impact resistance. The controlled composition creates a network that can flex without fracturing while maintaining toughness.
3Strength
If the composition ratio of the glass is changed to improve strength, then the mechanical strength improves, but the processability deteriorates
Solution Approach 1:
The patent carefully selects composition parameters within specific ranges: SiO2 (40-70 mol%), Al2O3 (5-20 mol%), B2O3 (5-20 mol%), and (Na2O+K2O)/(CaO+MgO) ratio (0.5-2.0). These parameter ranges are optimized to balance strength improvement with maintainable processability, ensuring the glass can be manufactured using conventional techniques while achieving enhanced mechanical properties.
Data Source
AI summary
A glass article prepared from a glass composition includes SiO2 in a range of about 48 mol % to about 57 mol %, Al2O3 in a range of about 10 mol % to about 20 mol %, Na2O in a range of about 8 mol % to about 18 mol %, K2O greater than 0 mol % and equal to or less than about 10 mol %, B2O3 in a range of about 10 mol % to about 17 mol %, and CaO or MgO greater than 0 mol % and equal to or less than about 7 mol % based on a total weight. A ration of Al2O3 and Na2O+K2O is in a range of about 0.7 to about 1.3, and a thickness of the glass article is equal to or less than about 100 μm.