Laser-Sintered Interconnect Coating for Chromium Suppression
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Solution Overview
Problem
The fabrication of solid oxide fuel cell interconnects is complex and expensive, and existing designs face challenges with non-uniform fuel distribution and density variations, leading to reduced stack yield and performance due to the use of conventional fuel manifolds and complex geometries.
Innovation Solution
A method of forming a protective coating on interconnects using laser sintering, which involves depositing a powder and then laser sintering it to create a dense adhesive coating that suppresses chromium evaporation and oxidation, improving interconnect performance and reducing fabrication costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fabrication methods are used for interconnects, then complex geometries and fuel manifolds can be formed, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent removes the fuel manifold component entirely from the interconnect design. Instead of incorporating complex internal fuel distribution manifolds, the system uses a simplified interconnect structure where fuel is distributed through external piping connected to fuel inlet/outlet ports on the interconnect surface, thereby eliminating manufacturing complexity while maintaining fuel distribution functionality
Solution Approach 2:
The interconnect is designed to perform multiple functions with a simple structure: electrical connection between cells, mechanical support, gas sealing, and fuel/oxidant distribution. The fuel distribution function is achieved through external piping rather than internal manifolds, allowing the interconnect itself to focus on its primary structural and electrical functions
2Reliability
If conventional interconnect designs are used, then fuel manifolds can be formed, but non-uniform fuel distribution and density variations reduce stack yield and performance
Solution Approach 1:
By removing the fuel manifold structure, the patent eliminates the source of non-uniform fuel distribution and density variations that plagued conventional designs. The simplified interconnect without internal manifolds avoids the manufacturing defects and performance issues associated with complex fuel distribution structures
Solution Approach 2:
The patent applies different functional zones to the interconnect surface: fuel inlet ports and outlet ports are positioned at specific locations to enable uniform fuel distribution across the stack without requiring internal manifolds. The fuel is distributed uniformly through the external piping system connected to these localized ports
3Reliability
If protective coatings are applied to suppress chromium evaporation and oxidation, then interconnect durability improves, but fabrication complexity increases
Solution Approach 1:
The patent replaces complex multi-step coating fabrication processes with a simplified thermal treatment process. Instead of applying multiple protective coating layers through complex deposition techniques, the interconnect undergoes a thermal oxidation treatment that forms a protective chromium oxide layer in situ, eliminating the need for external coating application equipment and processes
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 laser sintering method enhances interconnect durability, improves fuel distribution uniformity, and increases the effective contact surface area, leading to improved fuel cell stack performance and reduced fabrication costs.
Implementation Method 1
laser sintering the powder
Implementation Method 2
laser sintering the powder
Implementation Method 3
suppresses chromium evaporation
Implementation Method 4
suppresses chromium evaporation and oxidation
Data Source
AI summary
A method of forming a protective coating on an interconnect for an electrochemical device stack includes providing a powder on the interconnect and laser sintering the powder.