Regolith Filter Sintering With Pressure-Controlled Porosity
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Solution Overview
Problem
Current methods for processing regolith and 3D printing metal residues on the Moon are inefficient due to Earth-based technologies not being suitable for lunar conditions, leading to a need for in-situ resource utilization to produce valuable metal products like filters and thermal shields.
Innovation Solution
A method involving the partial fusion of regolith or 3D printing metal residues in a mold under controlled temperature and pressure conditions, allowing for the creation of cohesive, porous, or gas-tight layers, which can be used to manufacture filters and thermal shields, leveraging the materials' inherent porosity and angularity for effective filtration and thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Earth-based processing methods are used for regolith, then the process is familiar and equipment is available, but the methods are inefficient and not suitable for lunar conditions
Solution Approach 1:
The patent modifies processing parameters including heating to specific temperature ranges (500-1500°C), applying controlled pressure (1-100 atm), and adjusting particle size distributions to optimize sintering outcomes for lunar regolith, transforming Earth-based methods into space-appropriate processes
Solution Approach 2:
The patent creates layered structures with different properties within the same product - porous layers for filtration and denser layers for structural support - allowing different regions of the manufactured article to have optimized local properties for their specific functions
2Strength
If regolith particles are fully melted to fuse them, then strong bonding is achieved, but the angularity and porosity characteristics are lost
Solution Approach 1:
The patent applies partial sintering where particles are heated to temperatures below complete melting (500-1500°C depending on composition), achieving sufficient bonding strength while preserving the angular geometry and internal porosity of regolith particles that are essential for filtration and thermal insulation functions
Solution Approach 2:
The patent utilizes controlled phase transitions during sintering, heating particles to temperatures where partial melting occurs at particle contacts to create strong bonds, while the bulk material remains solid to maintain its characteristic shape and porosity
3Strength
If high pressure is applied to densify regolith layers, then mechanical strength increases, but porosity decreases
Solution Approach 1:
The patent applies controlled pressure (1-100 atm) during sintering that is sufficient to achieve particle bonding and green strength, but not excessive enough to completely densify the structure and eliminate porosity, maintaining the balance between strength and permeability needed for filter applications
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
This approach enables the production of reusable and recyclable filters and thermal shields with desired characteristics, reducing waste management costs and providing a valuable, sustainable source of materials for lunar applications, while maintaining the materials' mechanical and thermal properties.
Implementation Method 1
heating up content of the mold to exert the particles of the material to fuse at least partially with each other to generate a first manufactured layer
Implementation Method 2
the step of in-mold processing includes controlling gas pressure into the mold
Implementation Method 3
decreasing temperature
Data Source
AI summary
A method of manufacturing filters from regolith or 3d printing metal residues is presented, the method comprising (a) laying down a layer of particles of regolith or 3d printing metal residues into a mold; (b) closing the mold; (c) in-mold processing the regolith or 3d printing metal residues present in the mold by injecting pressurized gas into the mold and heating up the under-pressure regolith or 3d printing metal residues to exert the particles of regolith or 3d printing metal residues to fuse at least partially with each other without regolith or 3d printing metal residues melting; (d) decreasing temperature in the mold, depressurizing the mold, and opening the mold; repeating steps (a) to (d) at least once, wherein the particles of regolith or 3d printing metal residues of the step (a) are laid over the in-mold-processed regolith or 3d printing metal residues; and following the in-mold processed regolith or 3d printing metal residues reaching a desired parameter, demolding the in-mold processed regolith or 3d printing metal residues to obtain the regolith or 3d printing metal residues filter.