Fuel cell separator, process for producing the same and material therefor
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United States of America Patent
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Jun 20, 2006
Grant Date -
Sep 18, 2003
app pub date -
Sep 3, 2001
filing date -
Sep 4, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a fuel cell separator of excellent electrical conductivity, gas impermeability and strength. The composition for a fuel cell separator of this invention comprises a resin binder with a viscosity of 0.01 0.5 Pas at 150.degree. C. and a viscosity of 3 Pas or more at 25.degree. C. and graphite particles at a weight ratio of 1:(5 15) and a curing accelerator. The resin binder is exemplified by an epoxy resin binder composed of an epoxy resin and a curing agent for the epoxy resin. The process for producing the fuel cell separator of this invention is practiced by kneading and molding the aforementioned composition for a fuel cell separator and curing above the curing temperature of the composition. The fuel cell separator of this invention to be obtained by the aforementioned process shows a bulk density of 1.90 g/cm.sup.3 or more, a sheet resistance (areal pressure, 0.5 MPa) of 40 m .OMEGA.cm.sup.2 or less, a gas permeability of 1.times.10.sup.-14 cm.sup.2 or less and a flexural strength of 30 MPa or more.
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