Multi-Layer Silicon Carbide Membrane for Liquid Tin Filtration Stability
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Solution Overview
Problem
Existing filter systems for liquid metals like liquid tin face challenges such as high temperature handling, reactivity with materials, particulate formation, and stress from freeze-thaw cycles, leading to equipment clogging and membrane degradation.
Innovation Solution
A multi-layer silicon carbide filter membrane is developed, comprising a fine and coarse porous silicon carbide layer, with the coarse layer downstream, to reduce particulate formation and prevent silicon carbide particles from entering the liquid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-layer fine porous silicon carbide membrane is used for filtration, then filtration precision is improved, but the membrane becomes susceptible to particulate formation and structural degradation
Solution Approach 1:
The filter membrane is divided into multiple layers with different pore sizes. The fine porous silicon carbide layer provides high filtration precision by capturing small particulates, while the coarse porous silicon carbide layer provides structural support and reduces overall membrane stress. This segmentation allows each layer to specialize in one function, resolving the contradiction between fine filtration and membrane stability.
Solution Approach 2:
The invention uses a composite structure combining fine porous silicon carbide and coarse porous silicon carbide in a multi-layer configuration. This composite approach leverages the advantages of both materials: the fine porous layer for high precision filtration and the coarse porous layer for mechanical strength and stress distribution, thereby achieving both high filtration precision and membrane reliability.
2Temperature
If the filter membrane operates at high temperature, then liquid metal processing capability is improved, but thermal stress causes membrane degradation and breakage
Solution Approach 1:
The membrane is segmented into multiple layers that can distribute thermal stress more effectively. The coarse porous silicon carbide layer, with its larger pore structure and higher mechanical strength, acts as a stress-bearing layer that protects the fine porous layer from thermal degradation while maintaining high-temperature operation capability.
Solution Approach 2:
Different regions of the membrane have different properties optimized for their specific functions. The coarse porous layer has higher mechanical strength and thermal shock resistance for structural integrity, while the fine porous layer has optimized pore structure for filtration. This local quality differentiation allows the membrane to withstand high temperatures without degradation.
3Adaptability or versatility
If the liquid metal undergoes freeze-thaw cycles, then processing flexibility is improved, but repeated stress causes filter membrane fragmentation
Solution Approach 1:
The coarse porous silicon carbide layer serves as a cushioning layer that absorbs and distributes the mechanical stress from freeze-thaw cycles before it reaches the fine porous layer. This pre-protection mechanism prevents stress concentration and micro-crack formation, thereby extending the membrane's service life while maintaining processing flexibility.
Solution Approach 2:
The composite multi-layer structure combines materials with different mechanical properties to create a membrane that is resilient to cyclic stress. The coarse porous silicon carbide provides toughness and stress distribution, while the fine porous silicon carbide maintains filtration performance, together enabling the membrane to withstand repeated freeze-thaw cycles.
4Quantity of substance
If liquid tin is filtered through downstream equipment, then particulate removal is improved, but equipment clogging occurs due to particulate formation
Solution Approach 1:
The multi-layer membrane structure segments the filtration process into different stages. The fine porous layer captures small particulates that would otherwise pass through and cause downstream clogging, while the coarse porous layer handles larger particulates and provides structural stability. This segmentation ensures comprehensive particulate removal without compromising membrane integrity.
Solution Approach 2:
The invention converts the potential harm of fine porous membrane fragility into a benefit by using it in combination with a coarse porous support layer. The fine porous layer's high filtration capability is preserved while the coarse porous layer protects it from stress-induced particulate formation, thereby eliminating downstream clogging without sacrificing filtration efficiency.
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 multi-layer membrane significantly reduces silicon carbide particulates at downstream surfaces, enhancing filtration efficiency and preventing equipment clogging, even under high temperature and pressure conditions.
Implementation Method 1
passing the liquid metal through the filter membrane
Data Source
Figure 1A~1B
Figure 2A~2B
AI summary
Described are silicon carbide filters for use with liquid metals such as liquid tin, as well as methods of using such a filter to remove particles from the liquid metal, and systems and processes that use the filtered liquid metal.