SrO-Modified Glass Fiber Composition for Lower Melting Temperatures
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Solution Overview
Problem
The production of high-performance glass fibers is hindered by high forming and liquidus temperatures, making large-scale industrial production difficult, and existing solutions either sacrifice glass properties or increase production costs due to high Al2O3 content or risk devitrification.
Innovation Solution
A glass fiber composition with specific weight percentage ratios of SiO2, Al2O3, CaO, MgO, SrO, Na2O, K2O, Li2O, Fe2O3, CeO2, and TiO2 is developed, which reduces crystallization temperature and risk, improves mechanical properties, and enhances refractive index, allowing for more efficient and cost-effective large-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-performance glass compositions based on MgO-Al2O3-SiO2 system are used (e.g., S-2 glass), then mechanical properties and performance are improved, but forming temperature and liquidus temperature become excessively high (up to 1571°C and 1470°C respectively), making large-scale industrial production difficult
Solution Approach 1:
The patent modifies the chemical composition parameters of the glass system by introducing SrO and controlling the ratios of MgO, CaO, and Al2O3. This compositional parameter change lowers the forming temperature and liquidus temperature while maintaining high mechanical properties, enabling large-scale production without sacrificing performance.
Solution Approach 2:
The patent creates a composite glass composition by combining multiple oxide components (SiO2, Al2O3, MgO, CaO, SrO, and trace elements) in specific proportions. This composite approach achieves a balance between high mechanical properties and lower processing temperatures, resolving the contradiction between performance and manufacturability.
2Strength
If Al2O3 content is increased to improve glass properties, then mechanical strength is improved, but production difficulty increases and cost performance ratio decreases
Solution Approach 1:
The patent optimizes the Al2O3 content parameter within a specific range (18-30 wt%) rather than using excessively high amounts. By combining this controlled Al2O3 level with SrO addition and specific MgO/CaO ratios, the patent achieves high strength while improving ease of manufacture and cost performance.
Solution Approach 2:
The patent introduces SrO as an intermediary component that mediates between Al2O3 and the base glass matrix. This intermediary element helps achieve high mechanical strength with moderate Al2O3 content, reducing production difficulty compared to traditional high-Al2O3 formulations.
3Reliability
If forming temperature is increased to prevent crystallization in fiber attenuation, then fiber quality is improved, but temperature control difficulty increases and large-scale production becomes difficult
Solution Approach 1:
The patent modifies the glass composition parameters to achieve a forming temperature of 1150-1350°C and liquidus temperature of 1200-1400°C, creating an optimal temperature window. This parameter optimization maintains fiber quality while simplifying temperature control and enabling large-scale production.
Solution Approach 2:
The patent introduces trace elements (Fe2O3: 0.1-1.0 wt%, TiO2: 0.1-2.0 wt%, CeO2: 0.01-0.5 wt%) that locally modify the glass structure to control crystallization behavior. These localized compositional adjustments improve fiber quality during attenuation without requiring excessive temperature increases.
4Ease of manufacture
If Li2O content is increased to improve melting and forming conditions, then processing performance is improved, but chemical stability decreases and raw material cost increases significantly
Solution Approach 1:
The patent controls Li2O content within a moderate range (0.1-2.0 wt%) and balances it with Na2O and K2O. This parameter optimization achieves good melting and forming conditions while maintaining chemical stability and controlling raw material costs, avoiding the extremes of high Li2O formulations.
Data Source
AI summary
The present invention provides a glass fiber composition, glass fiber and composite material therefrom. The glass fiber composition comprises the following components expressed as percentage by weight: 58-63% SiO2, 13-17% Al2O3, 6-11.8% CaO, 7-11% MgO, 3.05-8% SrO, 0.1-2% Na2O+K2O+Li2O, 0.1-1% Fe2O3, 0-1% CeO2 and 0-2% TiO2, wherein a weight percentage ratio C1=(MgO+SrO)/CaO is greater than 1. Said composition greatly improves the refractive index of glass, significantly shields against harmful rays for humans and further reduces glass crystallization risk and production costs, thereby making it more suitable for large-scale production with refractory-lined furnaces.