Binder-Jet SOFC Interconnects for Dense, Warp-Free Manufacturing
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Solution Overview
Problem
Conventional powder metallurgy processes for forming solid oxide fuel cell (SOFC) interconnects are costly due to high capital and operating expenses, and result in density variations and warping, with additional steps required to achieve a dense, gas-tight interconnect.
Innovation Solution
The method involves binder jet printing a metal alloy powder or mixture to form a green interconnect, followed by debinding and pressureless sintering, eliminating the need for high-temperature oxidation and grit blasting, and allowing for the production of dense, chromium-iron alloy interconnects with reduced thickness and improved thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional powder metallurgy processes are used to form interconnects, then the manufacturing process is established, but production costs are high and density variations occur
Solution Approach 1:
The invention changes the manufacturing process parameters by using binder jet printing technology instead of conventional powder metallurgy. This involves depositing binder material selectively on metal powder layers to form green interconnects, which are then sintered at controlled temperatures. This parameter change achieves uniform density distribution while reducing production costs through automated layer-by-layer manufacturing.
Solution Approach 2:
The invention replaces the conventional mechanical powder metallurgy process with a binder jet printing system that uses controlled binder deposition. Instead of traditional mechanical pressing and sintering, the system uses inkjet-like deposition of binder material to selectively bind metal particles, followed by controlled thermal processing. This substitution eliminates density variations and reduces manufacturing complexity.
2Reliability
If conventional powder metallurgy processes are used, then interconnects can be produced, but warping and density variations occur requiring additional steps
Solution Approach 1:
The invention performs preliminary binding action during the layer-by-layer manufacturing process itself. The binder jet printing process selectively deposits binder material to form a green interconnect structure with uniform density from the beginning. This preliminary action eliminates the need for subsequent oxidation and grit blasting steps required in conventional processes to correct density variations and warping.
Solution Approach 2:
The invention extracts and eliminates the problematic oxidation and grit blasting steps from the manufacturing process. By using binder jet printing with controlled binder deposition and selective sintering, the process directly produces dense, warping-free interconnects, removing the need for additional post-processing steps that were previously necessary to correct defects.
3Ease of manufacture
If binder jet printing is used to form green interconnects, then production costs are reduced and density uniformity is improved, but additional debinding and sintering steps are required
Solution Approach 1:
The invention maintains continuous useful action throughout the manufacturing process. The binder jet printing process builds the green interconnect layer by layer in a continuous automated sequence. The subsequent debinding and sintering steps are integrated into a continuous thermal processing sequence, eliminating idle time and maximizing productivity while keeping production costs low through automated operation.
Solution Approach 2:
The invention merges the debinding and sintering steps into a single integrated thermal processing operation. Instead of separate sequential steps with intermediate handling, the green interconnect undergoes combined thermal treatment that simultaneously removes binder and densifies the structure. This merging reduces cycle time and increases productivity while maintaining cost 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
This approach reduces production costs and eliminates density variations, enabling the creation of dense, gas-tight interconnects with improved thermal conductivity and reduced warping, while simplifying the manufacturing process.
Implementation Method 1
binder jet printing a metal alloy powder or a metal powder mixture to form a green interconnect
Implementation Method 2
debinding the green interconnect
Implementation Method 3
sintering the green interconnect to form a metal alloy interconnect for an electrochemical stack
Data Source
AI summary
A method includes binder jet printing a metal alloy powder or a metal powder mixture to form a green interconnect, debinding the green interconnect, and sintering the green interconnect to form a metal alloy interconnect for an electrochemical stack.