Metal Composite Material for SOFC Cathode Adhesion
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Solution Overview
Problem
Existing metal films on solid oxide fuel cell (SOFC) cathodes exhibit poor adhesion to ceramic materials, leading to decreased active area for oxygen exchange reactions and compromised contact quality, which limits the reduction of cathode resistance and overall performance.
Innovation Solution
A sintered solid composite material comprising a metal and a calcium alumina compound is used to bond with ceramic materials, enhancing adhesion and microstructure uniformity, specifically for SOFC cathodes with perovskite crystal structures like LSCF, by forming a composite layer through techniques such as solid state reactions or solution approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin, porous, catalytic metal film is used on SOFC cathode, then catalytic activity and electrical conductivity are improved, but adhesion to ceramic substrate deteriorates
Solution Approach 1:
The patent applies composite materials by combining metal particles with calcium alumina compound particles to form a composite paste. This composite structure allows the metal to provide catalytic activity and electrical conductivity while the calcium alumina compound provides strong adhesion to the ceramic substrate, resolving the contradiction between these two requirements.
Solution Approach 2:
The calcium alumina compound acts as an intermediary material between the metal film and the ceramic substrate. It facilitates strong bonding to the substrate while allowing the metal component to maintain its catalytic and conductive properties, thus mediating between the conflicting requirements of adhesion and electrical performance.
2Reliability
If metal film adhesion is improved, then contact quality and active area are enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single composite paste formulation. The paste simultaneously provides adhesion, catalytic activity, and electrical conductivity through the combination of metal and calcium alumina compound particles, eliminating the need for separate manufacturing steps and reducing overall complexity.
Solution Approach 2:
The patent modifies the chemical composition parameters of the paste by incorporating calcium alumina compound particles with specific size ranges and concentrations. This parameter change transforms the paste properties to achieve both strong adhesion and high contact quality without complicating the manufacturing process.
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 composite material improves the adhesion and microstructure of metal films on ceramic substrates, reducing contact resistance and maintaining porosity, resulting in enhanced power density and stability of SOFCs over time.
Implementation Method 1
by forming a composite layer through techniques such as solid state reactions or solution approaches
Implementation Method 2
A sintered solid composite material comprising a metal and a calcium alumina compound is used to bond with ceramic materials
Data Source
AI summary
A sintered solid composite material is disclosed that includes a metal and a calcium alumina compound. The metal can be a noble metal. This composite material can bond to a ceramic material, and an article is disclosed that includes a first ceramic layer bonded to a second layer of the composite material of metal and calcium alumina compound. The ceramic can be a mixed ionic and electronic conductor (MEIC), and/or have a perovskite crystal structure, and/or be a mixed oxide comprising lanthanum, strontium, cobalt, iron and oxygen. The article can be used as an electrode such as a cathode of a solid oxide fuel cell.