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Continious production of exfoliated graphite composite compositions and flow field plates

United States Patent

July 20, 2010
View the Complete Patent at the US Patent & Trademark Office
A process of continuously producing a more isotropic, electrically conductive composite composition is provided. The process comprises: (a) continuously supplying a compressible mixture comprising exfoliated graphite worms and a binder or matrix material, wherein the binder or matrix material is in an amount of between 3% and 60% by weight based on the total weight of the mixture; (b) continuously compressing the compressible mixture at a pressure within the range of from about 5 psi or 0.035 MPa to about 50,000 psi or 350 MPa in at least a first direction into a cohered graphite composite compact; and (c) continuously compressing the composite compact in a second direction, different from the first direction, to form the composite composition in a sheet or plate form. The process leads to composite plates with exceptionally high thickness-direction electrical conductivity.
Shi; Jinjun (Columbus, OH), Zhamu; Aruna (Centerville, OH), Jang; Bor Z. (Centerville, OH)
Nanotek Instruments, Inc. (Dayton, OH)
11/ 901,227
September 17, 2007
This invention is based on the research results of a project supported by the US Department of Energy (DOE) SBIR-STTR Program. The US government has certain rights on this invention.