Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1986-04-03
1988-03-22
Dawson, Robert A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
4283066, 4283197, 428408, 429 36, B32B 3120
Patent
active
047326379
ABSTRACT:
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.
REFERENCES:
patent: 3650840 (1972-03-01), Dietz
patent: 4374906 (1983-02-01), Breault et al.
patent: 4382113 (1983-05-01), Schwartz et al.
Dettling Charles J.
Terry Peter L.
Dawson Robert A.
Engelhard Corporation
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