Multiscale Metal Support Surface Structuring for Thin-Film SOFCs
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Solution Overview
Problem
Existing thin-film processes for solid oxide fuel cells (SOFCs) are not applicable to metal supports due to the limitations of pore size and surface uniformity, which are necessary for high-performance low-temperature operation.
Innovation Solution
A method to manufacture a multiscale structured metal support by controlling the surface with microscale pores and roughness using metal and ceramic powders of varying sizes, involving vacuum filtration and heat treatment in a reducing atmosphere to create a surface functional layer with nanoscale pores and roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional high-temperature sintering processes are used to manufacture metal supports, then the supports exhibit good mechanical strength and porosity, but the pore size is on the order of tens of micrometers and the surface is not uniform, making thin-film processes inapplicable
Solution Approach 1:
The patent divides the pore-filling process into multiple stages using metal powders of different particle sizes (first metal powder with larger particles, second metal powder with smaller particles). This segmented approach allows progressive reduction of pore size from micrometers to sub-micrometer scale, achieving the precision needed for thin-film processes while maintaining manufacturing feasibility through systematic multi-step filling
Solution Approach 2:
The patent performs preliminary surface preparation by filling pores with metal powders and pressing the surface before applying thin-film processes. This preliminary action creates a uniform, dense surface with controlled pore size, establishing the necessary foundation for successful thin-film deposition and preventing subsequent manufacturing issues
2Manufacturing precision
If the surface of the metal support is pressed to reduce roughness, then the surface uniformity improves for thin-film deposition, but the pore size reduction may be insufficient without multiple filling stages
Solution Approach 1:
The patent segments the surface preparation into distinct stages: first filling with larger metal powder particles, then filling with smaller metal powder particles, and finally pressing. Each segment addresses specific requirements - larger particles provide initial pore occupation and surface leveling, smaller particles fill remaining voids for finer uniformity, and pressing consolidates the structure. This segmented methodology achieves high surface uniformity while keeping each individual step relatively simple
Solution Approach 2:
The patent changes the particle size parameter of the filling material across different stages - using first metal powder with larger particle size followed by second metal powder with smaller particle size. This parameter change enables progressive pore size reduction and surface uniformity improvement, transforming the surface characteristics to match thin-film process requirements through controlled variation of material properties
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 method enables the fabrication of a multiscale structured metal support suitable for thin-film applications, enhancing machinability and stacking suitability, resulting in high-performance low-temperature thin-film SOFCs with improved electrochemical performance and thermal stability.
Implementation Method 1
it is preferable to use a vacuum filtration process to fill the pores with the first metal powder
Implementation Method 2
filling the pores on the surface of the porous metal support with a first metal powder
Implementation Method 3
heat-treating the porous metal support, whose surface pores are filled with the first and second metal powders, in a reducing atmosphere
Implementation Method 4
heat-treating the porous metal support in a reducing atmosphere
Implementation Method 5
heat-treating the resulting support in a reducing atmosphere
Implementation Method 6
filling the pores on the surface of the heat-treated porous metal support with a ceramic powder
Data Source
AI summary
Provided is a method for manufacturing a multiscale structured metal support for low-temperature thin-film solid oxide fuel cells and to a metal support manufactured thereby. The method includes (a) filling the pores on the surface of a porous metal support with a first metal powder having a relatively large particle size; (b) filling the pores on the surface of the porous metal support with a second metal powder having a relatively small particle size and pressing the surface; (c) heat-treating the porous metal support, whose surface pores are filled with the first and second metal powders, in a reducing atmosphere; and (d) filling the pores on the surface of the heat-treated porous metal support with a ceramic powder and heat-treating the resulting support in a reducing atmosphere. Through these processes, a multiscale structured metal support suitable for application in low-temperature thin-film solid oxide fuel cells can be fabricated.