Basalt Fiber Heat Resistance via Oxide Composition Control
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Solution Overview
Problem
Current sound-absorbing materials for automobile mufflers, such as glass fibers, face challenges with insufficient heat-resistance at high exhaust gas temperatures and high manufacturing costs, while basalt fibers suffer from crystallization and loss of flexibility at elevated temperatures, lacking a cost-effective and durable solution for heat-resistant applications.
Innovation Solution
Optimizing the composition of basalt fibers by selecting appropriate oxides like Al2O3, SiO2, CaO, and MgO to inhibit crystallization and improve heat-resistance, using two types of basalt rock ores with different SiO2 content, and adding specific amounts of these oxides to maintain a glass phase at high temperatures, thereby enhancing the heat-resistance properties from 750°C to 850°C or 900°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If basalt fiber is used as a sound-absorbing material, then manufacturing cost is reduced, but heat-resistance property deteriorates at temperatures above 750°C due to crystallization
Solution Approach 1:
The invention changes the chemical composition parameters of the glass fiber by adjusting the weight percentages of SiO2, Al2O3, CaO, MgO, and other oxides to create a composition that maintains glassy state at high temperatures. Specifically, increasing SiO2 to 56-58.5 wt% and Al2O3 to 12-17 wt% while controlling CaO at 16-27 wt% raises the softening temperature and prevents crystallization up to 900°C
Solution Approach 2:
The invention creates a composite glass fiber material that combines multiple oxide components in specific proportions to achieve both cost-effectiveness (using basalt-derived composition) and high-temperature stability. The composite composition includes SiO2, Al2O3, CaO, MgO, and trace elements that work together to maintain structural integrity at temperatures where conventional basalt fiber would crystallize
2Reliability
If E glass fiber is subjected to acid treatment to form silica glass surface layer, then heat-resistance property is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention extracts the heat-resistance function from the complex acid treatment process and integrates it into the base glass composition itself. By incorporating high percentages of SiO2 (56-58.5 wt%) and Al2O3 (12-17 wt%) directly into the fiber composition, the material inherently develops a heat-resistant glassy structure without requiring separate acid treatment steps
Solution Approach 2:
The invention merges the heat-resistance property directly into the base glass composition rather than applying it as a separate surface treatment. The high SiO2 and Al2O3 content in the bulk composition ensures heat resistance throughout the fiber, eliminating the need for additional acid treatment processes
3Reliability
If S glass fiber is used for high heat-resistance applications, then heat-resistance property is improved, but manufacturing cost increases significantly
Solution Approach 1:
The invention modifies the glass composition parameters to achieve S glass-level heat resistance at lower cost by optimizing the ratio of SiO2 (56-58.5 wt%), Al2O3 (12-17 wt%), and CaO (16-27 wt%). This parameter optimization allows the fiber to maintain glassy state at 900°C without requiring the more expensive S glass composition
4Ease of manufacture
If conventional glass fiber composition is used, then manufacturing cost is reduced, but sound-absorbing and durability properties deteriorate at high temperatures
Solution Approach 1:
The invention changes the composition parameters from conventional glass fiber (which typically has lower SiO2 and higher impurities) to a refined composition with SiO2 at 56-58.5 wt%, Al2O3 at 12-17 wt%, and controlled CaO at 16-27 wt%. These parameter changes enhance both sound-absorbing properties and durability at high temperatures while maintaining cost-effectiveness through basalt-derived material
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 solution effectively inhibits crystallization and binding in basalt fibers, significantly improving their heat-resistance and durability, making them suitable for high-temperature applications in mufflers while reducing production costs.
Implementation Method 1
Optimizing the composition of basalt fibers by selecting appropriate oxides like Al2O3, SiO2, CaO, and MgO to inhibit crystallization and improve heat-resistance
Implementation Method 2
adding specific amounts of these oxides to maintain a glass phase at high temperatures, thereby enhancing the heat-resistance properties from 750°C to 850°C or 900°C
Data Source
AI summary
A network former and a glass modifier are formed and maintained by using basalt rock ore, and the crystallization and binding of basalt fiber are inhibited The heat-resistance property of basalt fiber is greatly improved from the conventional 750° C. to 850 or 900° C., and significant cost reduction is achieved over conventional products. Basalt fiber material having basalt rock as a raw material to which one or more kinds of oxide selected from Al2O3, SiO2, CaO, and MgO is added, and basalt fiber material having two kinds of basalt rock containing different amounts of elements as raw materials are provided.