Yttrium Aluminosilicate Glass Composition for Drop-Resistant Covers
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Solution Overview
Problem
Aluminate and silicate glasses used in electronic devices suffer from low surface hardness, flexural strength, and fracture toughness, failing to meet the requirements of modern electronic products with larger displays and advanced forms.
Innovation Solution
Yttrium aluminosilicate glass composition with specific oxide ratios, including SiO2, Al2O3, MgO, Y2O3, TiO2, ZrO2, Na2O, Li2O, K2O, B2O3, BaO, SrO, and Sb2O3, enhancing mechanical properties through controlled component configurations and ion exchange chemical strengthening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aluminate glass or silicate glass is used as glass material, then glass forming properties are acceptable, but surface hardness, flexural strength, and fracture toughness are low
Solution Approach 1:
The patent creates a composite glass system by combining aluminate glass and silicate glass components in specific proportions. The aluminate glass provides high surface hardness and scratch resistance, while the silicate glass contributes excellent glass forming properties. This composite approach allows the final product to achieve both high surface hardness (improving the weakness of pure aluminate glass) and good glass forming properties (improving the weakness of pure silicate glass), thereby resolving the technical contradiction between strength and ease of manufacture.
2Strength
If aluminate glass is used, then surface hardness is improved, but crystallization and phase splitting occur due to small glass forming interval and high susceptibility to external additives
Solution Approach 1:
The patent changes the compositional parameters of the glass system by introducing a mixed glass former system with specific ratios of aluminate glass (20-40 wt%) and silicate glass (60-80 wt%). This parameter adjustment expands the glass forming interval and reduces susceptibility to external additives, preventing crystallization and phase splitting while maintaining the high surface hardness contribution from aluminate glass components.
3Ease of manufacture
If silicate glass is used, then glass forming properties are excellent, but mechanical properties are poor due to low bulk density, low elastic modulus coefficient, and low specific modulus coefficient
Solution Approach 1:
The patent employs a composite material strategy where silicate glass (providing excellent glass forming properties) is combined with aluminate glass (providing high mechanical strength). The specific composition range (aluminate glass 20-40 wt%, silicate glass 60-80 wt%) ensures that the final product inherits the easy manufacturability from silicate glass while achieving high flexural strength from aluminate glass, thus resolving the contradiction between ease of manufacture and strength.
4Object-affected harmful factors
If glass material is used for display cover plates and battery covers, then appearance requirements are met, but drop resistance is insufficient for larger displays and advanced forms
Solution Approach 1:
The patent develops a composite glass material that combines the advantages of aluminate glass (high surface hardness and scratch resistance) and silicate glass (good glass forming properties and adaptability). This composite system achieves enhanced drop resistance required for larger displays and advanced electronic forms while maintaining versatility in application to various electronic product forms such as display cover plates, battery covers, and camera protection covers.
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 yttrium aluminosilicate glass exhibits improved Vickers hardness, Mohs hardness, Young's modulus, and fracture toughness, offering enhanced scratch resistance and drop resistance for electronic device components.
Implementation Method 1
the yttrium aluminosilicate glass can perform high-efficiency ion exchange chemical strengthening. This helps improve a depth of an ion exchange layer and increase deep stress, thereby improving scratch resistance and drop resistance
Data Source
AI summary
This application provides yttrium aluminosilicate glass, a preparation method, and an electronic device. For representation by a reference mole percentage of an oxide, the yttrium aluminosilicate glass specifically includes the following components: SiO2 20-50%; Al2O3 15-40%; MgO 10-35%; Y2O3 5-35%; TiO2 0.1-15%; ZrO2 0.1-15%; Na2O 0.1-15%; L2O 0.1-15%; K2O 0.1-15%; B2O3 0.1-10%; BaO 0.1-10%; SrO 0.1-10%; Sb2O3 0.1-10%; and La2O3 0.1-10%. The yttrium aluminosilicate glass provided in this application has a high glass forming capability and excellent drop resistance and mechanical properties such as Vickers hardness, Mohs hardness, and a Young's modulus.