Glass Fiber Composition for High Elastic Modulus
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Solution Overview
Problem
Conventional glass fiber production using S glass faces challenges due to a narrow working temperature range and high 1,000-poise (100 Pa·s) and liquid phase temperatures, leading to crystallization issues and insufficient elastic modulus.
Innovation Solution
A glass fiber composition with SiO2 content between 57.0% to 63.0%, Al2O3 between 19.0% to 23.0%, MgO between 10.0% to 15.0%, and CaO between 5.5% to 11.0% by weight, optimizing the weight ratios and total content to reduce temperatures and prevent devitrification, thereby broadening the working temperature range and enhancing elastic modulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If S glass composition is used to achieve high strength and elastic modulus, then the elastic modulus is improved, but the working temperature range becomes narrow and production becomes difficult
Solution Approach 1:
The patent changes the chemical composition parameters of the glass by precisely controlling the content ranges of SiO2 (57.0-63.0 wt%), Al2O3 (19.0-23.0 wt%), MgO (10.0-15.0 wt%), and CaO (5.5-11.0 wt%). This parameter optimization simultaneously achieves high elastic modulus (≥85 GPa) and broadens the working temperature range to 40°C or more, resolving the contradiction between strength and manufacturability
Solution Approach 2:
The patent creates a composite glass system combining multiple oxides (SiO2-Al2O3-MgO-CaO) in specific proportions. This composite composition leverages the synergistic effects of different components: SiO2 provides structural framework and high modulus, Al2O3 enhances strength, MgO and CaO lower the melting temperature and broaden working range, achieving both high performance and ease of production
2Ease of manufacture
If the 1,000-poise temperature and liquid phase temperature are reduced to ease production, then the production becomes easier, but the elastic modulus becomes insufficient
Solution Approach 1:
The patent optimizes composition parameters to achieve a balanced state where the 1,000-poise temperature is 1,350°C or lower (ease of production) while maintaining elastic modulus of 85 GPa or higher (structural strength). The specific weight ratio of SiO2/Al2O3 (2.7-3.2) is critical in achieving this balance
Solution Approach 2:
The patent applies different functional roles to different components: SiO2 and Al2O3 primarily contribute to high elastic modulus and structural integrity, while MgO and CaO primarily contribute to lowering processing temperatures and broadening working range. This localized functional assignment resolves the contradiction between strength and ease of production
3Reliability
If the working temperature range is broadened to improve production stability, then the production stability is improved, but the elastic modulus decreases
Solution Approach 1:
The patent identifies and optimizes critical composition parameters including SiO2 content (57.0-63.0 wt%), Al2O3 content (19.0-23.0 wt%), and their weight ratio (2.7-3.2). These parameter changes simultaneously achieve broad working temperature range (≥40°C) for production stability and high elastic modulus (≥85 GPa), resolving the contradiction between reliability and strength
Data Source
AI summary
There is provided a glass fiber comprising the SiO2 content is 57.0 to 63.0% by weight; the Al2O3 content is 19.0 to 23.0% by weight; the MgO content is 10.0 to 15.0% by weight; the CaO content is 4.0 to 11.0% by weight; and the total content of SiO2, Al2O3, MgO and CaO is 99.5% by weight or higher based on the total weight.