Ceramic Bushings with Local Heating for Basalt Fiber Production
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Solution Overview
Problem
The production of continuous basalt fibers is inefficient due to high temperature processing, which causes Pt-Rd bushing deterioration and results in higher costs, as well as issues with incomplete melting of high-melting point components leading to fiber breakage and poor mechanical properties, limiting their commercial compatibility compared to E-glass fibers.
Innovation Solution
Development of ceramic bushings with local heating elements and refractory materials, such as B4C and BN, capable of operating at temperatures up to 1550 C, along with a multi-sectional design to maintain uniform temperature and prevent crystallization, allowing for efficient basalt glass body homogenization and fiberization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If Pt-Rd bushings are used for basalt fiber production, then fiberization can proceed, but the bushings deteriorate due to high temperature (200-250°C greater than E-glass processing temperature) causing creep and sag
Solution Approach 1:
The patent replaces expensive, long-lasting Pt-Rd bushings with cheaper, shorter-lived ceramic bushings that can withstand the high temperatures required for basalt fiber production. The ceramic material (e.g., alumina, zirconia) provides sufficient thermal stability and chemical inertness at 1450-1550°C, allowing the bushings to complete their functional lifecycle without deteriorating from creep or sag, thus resolving the contradiction between operating temperature and bushing reliability.
Solution Approach 2:
The patent employs composite ceramic materials with enhanced thermal and mechanical properties to construct the bushings. These composite ceramics combine multiple oxides or ceramic phases that provide both high-temperature resistance and structural integrity, enabling the bushings to maintain their shape and function reliably at the elevated temperatures required for basalt fiberization.
2Productivity
If high temperature processing is used for basalt fiber production, then fiberization efficiency increases, but Pt-Rd bushing deterioration accelerates leading to higher costs
Solution Approach 1:
The patent substitutes expensive Pt-Rd bushings with more economical ceramic bushings that are optimized for high-temperature service. Although ceramic bushings have shorter service lives than Pt-Rd bushings, their lower material cost and suitability for basalt fiberization temperatures result in reduced overall production costs and eliminated material loss from platinum-rhodium deterioration.
Solution Approach 2:
The patent changes the material parameter of the bushing from metallic (Pt-Rd alloy) to ceramic composition, which fundamentally alters the temperature-resistance characteristics. This parameter change enables the bushing to operate stably at 1450-1550°C without the chemical reactions and physical deterioration that plague metallic bushings, thereby maintaining high production efficiency while eliminating bushing material loss.
3Productivity
If conventional bushings are used, then production can proceed, but incomplete melting of high-melting point components occurs causing fiber breakage
Solution Approach 1:
The patent raises the processing temperature parameter to 1450-1550°C, which is sufficient to completely melt and homogenize high-melting point components in the basalt feedstock. This temperature parameter change ensures complete decomposition of minerals like olivine and pyroxene, preventing undissolved particles from causing fiber breakage and improving overall fiber quality and continuity.
Solution Approach 2:
The patent incorporates preliminary heating and homogenization zones before the fiberization point, where the basalt feedstock is pre-heated and completely melted to ensure all high-melting point components are fully decomposed and uniformly distributed. This preliminary action prevents incomplete melting from reaching the fiberization zone, thereby eliminating the cause of fiber breakage.
4Manufacturing precision
If high temperature processing is used, then complete decomposition of high-melting point components is achieved, but bushing material reacts with basalt composition
Solution Approach 1:
The patent employs ceramic materials with high chemical stability, such as alumina (Al2O3), zirconia (ZrO2), or their composites, which exhibit minimal chemical reactivity with basalt melt components even at 1450-1550°C. These composite ceramic bushings maintain their structural and chemical integrity in the aggressive basalt environment, preventing harmful chemical reactions while enabling complete decomposition of high-melting point components for homogeneous glass body formation.
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 ceramic bushings enhance the efficiency of basalt fiber production by maintaining high temperatures, reducing fiber breakage, and improving mechanical properties, making basalt fibers more cost-effective and suitable for various applications, including 3D-FRC, by ensuring complete decomposition of high-melting point components and maintaining fiber ductility.
Implementation Method 1
The internal heater is made from refractory electric conductive material, for example: corrosion resistant SiC (1650 C) Mo; MoSi2; MoSi2-Kanthal Super 33 (1800 C); MoSi2-Kanthal Super (1900 C); Ta, Nb, Nf-based alloys; Cr—Re-M; Cr—Mo-M; Cr—Os-M based alloys having temperature operation up to 1750 C
Implementation Method 2
The ceramic materials which exhibit high corrosion and thermal shock resistance are suitable to make key members if ceramic bushing capable withstand basalt glass body action at the temperatures from 1250 C to 1800 C
Implementation Method 3
ensuring complete decomposition of high-melting point components
Implementation Method 4
a multi-sectional design to maintain uniform temperature and prevent crystallization
Data Source
AI summary
Several versions of ceramic bushing/s consisting local heating element/s integrated in apparatus for manufacturing mineral/basalt fibers from natural basalt rocks have been designed based on alternatives to Pt/Pt-Rd bushings approach. The ceramic bushing/s having local heating element/s concept promotes minimization or complete replacement of platinum group metals from the process of continuous basalt fiber manufacturing. More specifically, the invention discloses ceramic bushing/s comprising in combination apparatus are designed for manufacturing continuous mineral (basalt) fibers from 7 to 20 micrometers (μm), and also the coarse fibers from 20 μm to 100 micrometers (μm) in amorphous structural state which exhibit flexible/ductile properties. The minimization or complete replacement of the precious Pt, Rd metals allows reduce the cost of basalt fiber therefore increase its compatibility in reinforced concrete/composite applications including Three Dimension Fiber Reinforced Concrete—3D FRC and many other applications. The currently available Pt-Rd orificed bushings are applied for basalt fiber industry greatly limit both the initial raw materials composition, and the efficiency of continuous basalt fiber production increasing their cost. The ceramic bushing/s consisting local heating elements are integrated in apparatus all together capable provide operations from natural basalt rock melting, homogenous basalt glass body preparation, basalt glass body supply to the bushings positioned beneath the bottom platform of the feeder's forehead.