Glass Sheet Composition for Impact Resistance and Curving Workability
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Solution Overview
Problem
Current glass sheets for vehicle windshields lack sufficient impact resistance against scattered debris while maintaining low weight and transparency, as increasing crystallinity or thickness compromises curving workability and transparency.
Innovation Solution
A glass sheet composition of 40-80% SiO2, 5-30% Al2O3, 0-20% Li2O+Na2O+K2O, 3-35% MgO, and 0-15% CaO+SrO+BaO, with a molar ratio (Li2O+Na2O+K2O)/(B2O3+P2O5) ≤ 1.5, which enhances Young's modulus and crack resistance, allowing for effective energy absorption and reduced penetration of debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crystallinity of crystallized glass is increased to increase hardness and attenuate collision energy, then impact resistance is improved, but curving workability deteriorates and the glass becomes difficult to bend
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the glass (SiO2: 40-80%, Al2O3: 5-30%, Li2O+Na2O+K2O: 0-20%, MgO: 3-35%, CaO+SrO+BaO: 0-15%) to achieve the desired balance between hardness and workability. This compositional parameter optimization allows the glass to have sufficient impact resistance while maintaining curving workability for windshield manufacturing.
Solution Approach 2:
The patent uses composite materials by creating a glass composition that combines multiple oxides in specific proportions. The synergistic effect of SiO2 (providing hardness), Al2O3 (enhancing strength), and the controlled amounts of Li2O, Na2O, K2O, MgO, CaO, SrO, and BaO (affecting workability and melting characteristics) creates a composite glass material that simultaneously achieves impact resistance and curving workability.
2Strength
If the thickness of the crystallized glass is increased to attenuate collision energy, then impact resistance is improved, but weight increases and transparency may be impaired
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition parameters to enhance the intrinsic impact resistance of the glass. By adjusting the ratios of SiO2, Al2O3, Li2O, Na2O, K2O, MgO, CaO, SrO, and BaO, the glass achieves high impact resistance at lower thicknesses, thereby reducing weight while maintaining transparency and safety performance.
3Strength
If the thickness of the glass sheet is increased to improve impact resistance, then collision energy attenuation is improved, but weight increases
Solution Approach 1:
The patent uses composite materials by formulating a multi-oxide glass composition where SiO2 provides the base structure and hardness, Al2O3 enhances strength, and the controlled additions of Li2O, Na2O, K2O, MgO, CaO, SrO, and BaO create a composite material with optimized impact resistance. This allows achieving high impact resistance without increasing thickness and weight.
Data Source
AI summary
A glass sheet of the present invention is a glass sheet for producing a glass-resin composite through integral combination with a resin sheet, the glass sheet including as a glass composition, in terms of mol %, 40% to 80% of SiO2, 5% to 30% of Al2O3, 0% to 20% of Li2O+Na2O+K2O, 3% to 35% of MgO, and 0% to 15% of CaO+SrO+BaO.