| 摘要 |
A fuel cell separator material which exhibits excellent electrical conductivity, high gas impermeability, high strain at break, and excellent strength, and a process of producing the same are disclosed. The fuel cell separator material includes a graphite/cured resin molded product obtained by binding spherical natural graphite particles with a thermosetting resin, the spherical natural graphite particles being prepared by spheroidizing natural flake graphite having an average particle diameter of 1 to 50 mum by dry impact blending, and having an average particle diameter of 20 to 100 mum, a particle density measured in water of 2 g/cm3 or more, and a compression recovery rate when pressurized at 50 MPa of 120% or less, and a density during compression of 1.9 g/cm3. The process includes preparing spherical natural graphite particles having the above properties, mixing the spherical natural graphite particles and a thermosetting resin so that the weight ratio of the graphite particles and the solid content of the resin is 90:10 to 65:35, drying and grinding the mixture to prepare a molding powder, filling a mold provided with protrusions for forming gas passages with the molding powder, and thermocompression-molding the molding powder at a temperature of 120° C. or more and a pressure of 20 to 100 MPa.
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