Amorphous Metallic Separator for Fuel Cells
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Solution Overview
Problem
The practical use of metallic separators for polymer electrolyte fuel cells (PEFCs) is hindered by the need for materials that balance corrosion resistance, conductivity, formability, and cost, with existing solutions often requiring complex procedures and expensive special treatments.
Innovation Solution
A thin plate manufacturing method using an ultraquenching transition control injector to produce a metallic thin plate with an amorphous structure, incorporating conductive powders like carbon or boron carbide, which maintains high corrosion resistance and conductivity without increasing production complexity or costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon materials are used for PEFC separators to achieve good corrosion resistance, then corrosion resistance is improved, but workability deteriorates and thickness increases
Solution Approach 1:
The invention changes from carbon-based materials to metallic amorphous alloy materials, fundamentally altering the material parameter from non-metallic to metallic. This enables the separator to maintain excellent corrosion resistance while achieving superior workability, including excellent press formability and the ability to be manufactured at thin gauges (0.1-1.0 mm), directly addressing the workability and thickness issues of carbon materials
2Reliability
If special surface treatments such as plating are applied to improve conductivity of passive layer materials, then conductivity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The amorphous alloy material inherently possesses high conductivity as an intrinsic property of its structure and composition, eliminating the need for additional surface treatments or plating processes. The material serves itself by providing both corrosion resistance and conductivity without requiring external modifications, thereby simplifying the manufacturing procedure and reducing costs
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 production of metallic separators with excellent corrosion resistance, conductivity, and formability at a lower cost, suitable for PEFCs, while maintaining amorphous structure integrity and reducing contact resistance.
Implementation Method 1
a film is formed on a substrate surface while flying powder particles are quenched, finally followed by the release of the film from the substrate so as to obtain an amorphous thin plate
Data Source
Figure 1
Figure 2A~2B
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AI summary
[Problem] To prepare a metallic separator for PEFCs having excellent corrosion resistance, conductivity, and formability at low cost. [Solution] A thin plate is prepared by an ultraquenching transition control injector with a mixture of a metal powder having corrosion resistance to form a matrix and a powder having conductivity, as a raw material. When the matrix of the thin plate is crystal-structure metal, the plate can be formed at room temperature, and when the matrix is metallic glass, the plate can be formed in a supercooled liquid state. Therefore the plate can be finished into a separator with an intended shape.