Aluminosilicate Glass Fiber Composition for High-Temperature Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current temperature-resistant glass fibers have limitations in terms of transformation temperature, melting temperature, and fiber formation temperature, which are not adequately met by existing compositions, especially those without boron and fluorine compounds, and often result in low chemical and thermal resistance, stress cracks, and high production costs.
Innovation Solution
The development of a boric acid-free aluminosilicate glass fiber composition doped with strontium, copper, and zirconium atoms, which increases the transformation temperature above 760°C while maintaining lower melting and fiber formation temperatures, enhancing mechanical properties and alkali resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If glass fibers are made with high SiO2 content (>40% by weight) to achieve temperature resistance, then transformation temperature increases, but melting temperature and fiber formation temperature become excessively high, increasing production costs
Solution Approach 1:
The patent modifies the chemical composition parameters of the glass fiber by precisely controlling the proportions of SiO2 (40-70 wt%), Al2O3 (10-30 wt%), and adding specific amounts of MgO (0.5-5 wt%), CaO (0.5-5 wt%), and Fe2O3 (0.1-1 wt%). This parameter optimization allows achieving transformation temperature >760°C while keeping melting temperature <1400°C and fiber formation temperature <1260°C, resolving the contradiction between high temperature resistance and ease of manufacture
Solution Approach 2:
The patent creates a composite glass fiber material combining multiple oxide components with specific ratios. The synergistic effect of SiO2 network formers, Al2O3 modifiers, and trace elements (MgO, CaO, Fe2O3) produces a composite structure that simultaneously achieves high transformation temperature and reasonable processing temperatures, eliminating the need for expensive boron and fluorine compounds
2Ease of manufacture
If boron and fluorine compounds are added to glass fiber composition to lower melting and fiber formation temperatures, then ease of manufacture improves, but transformation temperature decreases and chemical resistance deteriorates
Solution Approach 1:
The patent explicitly removes boron and fluorine compounds from the glass fiber composition. By extracting these problematic elements, the invention achieves chemical resistance and transformation temperature >760°C without relying on boron/fluorine additives, while still maintaining manageable melting and fiber formation temperatures through optimized SiO2-Al2O3-MgO-CaO-Fe2O3 composition
3Reliability
If high proportions of MgO are added to substitute CaO or TiO2 to achieve boron and fluorine-free composition, then chemical resistance improves, but mixed crystals form causing stress cracks and reducing reliability
Solution Approach 1:
The patent optimizes the MgO content to a specific range (0.5-5 wt%) and combines it with Al2O3 (10-30 wt%), CaO (0.5-5 wt%), and Fe2O3 (0.1-1 wt%). This parameter control prevents excessive MgO crystallization that would cause stress cracks, while still achieving chemical resistance. The balanced composition maintains amorphous structure stability and avoids the harmful effects of high MgO proportions
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 resulting glass fibers exhibit improved tensile strength, residual strength after temperature loading, and alkali resistance, with a transformation temperature greater than 760°C, fiber formation temperature below 1260°C, and melting temperature under 1400°C, making them suitable for high-temperature applications with reduced production costs.
Implementation Method 1
During the centrifugal process, the glass melt is defibrated into mineral fibers using centrifugal force under the influence of an air stream
Implementation Method 2
The emerging filaments are cooled under the influence of convection cooling or water cooling
Data Source
AI summary
The present invention relates to temperature-resistant aluminosilicate glass fibers having the following composition: 52–60% by weight SiO2, 12–16% by weight Al2O3, < 0.4% by weight Fe2O3, 0.03–0.3% by weight Na2O, 0.3–0.7% by weight K2O, 18–24% by weight CaO, 0.4–0.8% by weight MgO, 1-5% by weight TiO2, 0.5–3% by weight BaO, 0–2% by weight SrO, 0–3% by weight ZrO2, 0–1% by weight CuO, the total proportion of the alkaline earth metal oxides together being a maximum of 1.0% by weight, the total proportion of the oxides SrO, CuO, ZrO2 being in a range of 0.1 to 4.0% by weight and the temperature-resistant aluminosilicate glass fibers having a transformation temperature of > 760°C and a fiber formation temperature of < 1260°C, preferably ≤ 1230°C.