Carbon Abrasive for Fuel Cell Separators With Low Residue
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Solution Overview
Problem
Existing air-blast abrasion materials for fuel cell separators tend to leave residues on the surface, leading to issues with contact resistance and adhesion to gaskets.
Innovation Solution
An air-blast abrasion material composed of a carbon powder with a new Mohs hardness of 2.5 to 7.0 is used for surface treatment of fuel cell separators, resulting in a surface with minimal residue and improved electrical conductivity and gasket adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alumina abrasion material is used for surface treatment of fuel cell separator, then contact resistance is reduced, but abrasion material residues remain on the surface causing contamination
Solution Approach 1:
The invention changes the material parameter of the abrasion material from alumina to carbon powder with specific hardness (2.5-7.0 on Mohs scale). This parameter change allows the abrasion material to have similar or better abrasion effectiveness while being chemically compatible with the fuel cell separator components, preventing residue formation and contamination.
2Reliability
If conductive fine particles are attached to separator surface by shot blasting, then contact resistance is reduced, but particles detach during assembly or operation causing degradation
Solution Approach 1:
The invention uses carbon powder that has the same chemical composition as the graphite particles already present in the fuel cell separator. This homogeneity ensures that the abrasion material integrates seamlessly with the existing structure, preventing detachment during assembly or operation while maintaining electrical conductivity.
Solution Approach 2:
The invention changes the hardness parameter of the abrasion material to match or be slightly harder than the graphite particles in the separator (Mohs hardness 2.5-7.0). This parameter matching ensures effective abrasion for reducing contact resistance while the chemical compatibility prevents particle detachment.
3Reliability
If separator surface is roughened by blasting to improve electrical conductivity, then contact resistance decreases, but surface contamination with abrasion material occurs
Solution Approach 1:
The invention changes the material composition parameter from alumina to carbon powder with controlled hardness (2.5-7.0 Mohs). This parameter change enables the surface roughening process to improve electrical conductivity through better contact while avoiding contamination, as the carbon powder residues are chemically compatible with the fuel cell components.
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 use of the carbon powder abrasion material effectively reduces surface residue, enhances electrical conductivity, and improves adhesion to gaskets, maintaining stable power generation efficiency in fuel cells.
Implementation Method 1
an air-blast abrasion material composed of a carbon powder having a new Mohs hardness of from 2.5 to 7.0
Data Source
AI summary
Provided is an air-blast abrasion material comprising a carbon powder having a new Mohs hardness of 2.5-7.0. The air-blast abrasion material does not readily remain on the surface of an object being blasted, and therefore, little residue of the abrasion material remains on the surface of a fuel cell separator in which at least part of the surface is subjected to roughening treatment using the air-blast abrasion material.