High-Modulus Glass Fiber Composition With Lower Forming Temperature
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Solution Overview
Problem
The production of high-modulus glass fibers faces challenges such as high forming and liquidus temperatures, high crystallization rates, narrow temperature ranges for fiber formation, and the presence of many bubbles in molten glass, which hinder large-scale industrial production and compromise mechanical properties and corrosion resistance.
Innovation Solution
A glass fiber composition with specific weight percentages of SiO2, Al2O3, MgO, Y2O3, CaO, and controlled ratios between these components, along with minimal alkali metal oxides, to enhance structural stability, reduce refining temperature, and minimize crystallization, facilitating large-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If S-glass composition is used to achieve high modulus properties, then the elastic modulus is improved, but the forming temperature and liquidus temperature become excessively high making large-scale production difficult
Solution Approach 1:
The patent modifies the chemical composition parameters of the glass, specifically adjusting the ratios of SiO2, Al2O3, MgO, and adding Y2O3 and CaO in controlled amounts. This changes the thermal properties of the glass, lowering both the forming temperature and liquidus temperature while preserving the high elastic modulus property, thus resolving the contradiction between strength and temperature requirements for production
Solution Approach 2:
The patent creates a composite glass composition by combining multiple oxide components (SiO2, Al2O3, MgO, Y2O3, CaO, and trace elements) in specific proportions. This composite approach allows the glass to achieve both high elastic modulus and reduced melting/forming temperatures, enabling large-scale production while maintaining superior mechanical properties
2Temperature
If HS glass composition is used to lower forming temperature, then the forming temperature is reduced, but the liquidus temperature remains high and crystallization rate increases making fiber formation difficult
Solution Approach 1:
The patent carefully adjusts the compositional parameters, particularly the Al2O3 content (15-25 wt%) and MgO content (8-18 wt%), and introduces Y2O3 (0.1-5 wt%) and CaO (0.1-5 wt%) to modify the glass structure. These parameter changes widen the temperature window between forming temperature and liquidus temperature, reducing crystallization tendency while maintaining low forming temperature, thus resolving the contradiction between temperature reduction and crystallization resistance
3Temperature
If high contents of Li2O and B2O3 are added to HS glass to lower forming temperature, then the forming temperature is reduced, but the mechanical properties and corrosion resistance deteriorate
Solution Approach 1:
The patent replaces expensive and harmful additives (Li2O and B2O3) with more stable and beneficial components (Y2O3 and CaO in controlled amounts). This substitution achieves the same temperature-reducing effect without compromising mechanical properties or corrosion resistance, effectively resolving the contradiction between forming temperature reduction and reliability maintenance
4Strength
If S-glass composition is used to achieve high modulus, then the elastic modulus is improved, but the number of bubbles in molten glass increases making production inefficient
Solution Approach 1:
The patent optimizes the chemical composition parameters, particularly the SiO2/Al2O3 ratio and the addition of Y2O3 and CaO, which modify the viscosity and gas solubility characteristics of the molten glass. This reduces bubble formation and improves gas escape during processing, thereby increasing production efficiency while maintaining high elastic modulus properties
Data Source
AI summary
The present invention provides a high-modulus glass fiber composition, a glass fiber and composite material thereof. The high-modulus glass fiber composition comprises the following components expressed as percentage by weight: 43-58% of SiO2, 15.5-23% of Al2O3, 8-18% of MgO, greater than or equal to 25% of (Al2O3+MgO), 0.1-7.5% of CaO, 7.1-22% of Y2O3, greater than or equal to 16.5% of (MgO+Y2O3), 0.01-5% of TiO2, 0.01-1.5% of Fe2O3, 0.01-2% of Na2O, 0-1.5% of K2O, 0-0.9% of Li2O, 0-4% of SrO, and 0-5% of (La2O3+CeO2). The composition can significantly increase the modulus of glass fiber, significantly reduce the refining temperature of molten glass, and improve the refining performance of molten glass; it can also optimize the hardening rate of molten glass, improve the cooling performance of glass fiber and reduce the crystallization rate. The composition is suitable for large-scale production of high-modulus glass fiber.