Integral gas seal for fuel cell gas distribution assemblies and method of fabrication
Patent
·
OSTI ID:865378
A porous gas distribution plate assembly for a fuel cell, such as a bipolar assembly, includes an inner impervious region wherein the bipolar assembly has good surface porosity but no through-plane porosity and wherein electrical conductivity through the impervious region is maintained. A hot-pressing process for forming the bipolar assembly includes placing a layer of thermoplastic sealant material between a pair of porous, electrically conductive plates, applying pressure to the assembly at elevated temperature, and allowing the assembly to cool before removing the pressure whereby the layer of sealant material is melted and diffused into the porous plates to form an impervious bond along a common interface between the plates holding the porous plates together. The distribution of sealant within the pores along the surface of the plates provides an effective barrier at their common interface against through-plane transmission of gas.
- Research Organization:
- Engelhard Corporation, Iselin, NJ (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC01-78ET15366
- Assignee:
- Engelhard Corporation (Iselin, NJ)
- Patent Number(s):
- 4,505,992
- Application Number:
- 06/484,014
- OSTI ID:
- 865378
- Country of Publication:
- United States
- Language:
- English
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allowing
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cell
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common
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surface
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thermoplastic
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allowing
applying
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barrier
bipolar
bipolar assembly
bond
cell
cell gas
common
conductive
conductive plate
conductive plates
conductivity
cool
diffused
distribution
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effective
effective barrier
electrical
electrical conductivity
electrically
electrically conductive
elevated
elevated temperature
fabrication
form
forming
fuel
fuel cell
gas
gas distribution
gas seal
holding
hot-pressing
impervious
impervious region
inner
inner impervious
integral
integral gas
interface
layer
maintained
material
melted
method
pair
placing
plate
plate assembly
plates
pores
porosity
porous
porous gas
porous plates
pressure
process
provides
region
removing
seal
sealant
sealant material
surface
temperature
thermoplastic
through-plane
transmission
whereby