Chemically modified carbonaceous materials made by the defluorination of graphite fluoride and process therefor
OwnerChing-Cheh Hunginventor
Life of this patent
Estimating the term…
Abstract
A method of making chemically modified carbon-based materials for engineering purposes from a precursor containing graphite fluoride by using halocarbons or elemental sulfur as chemical agents that diffuse into the lamellar crystal structure of the graphite fluoride and permit defluoridation at a controlled rate upon heating, to produce graphite fluoride-free intermediate carbon material and, upon further heating to form a chemically modified non-graphitized carbon.
Claims5
A method of making chemically modified carbon-based materials from a precursor containing graphite fluoride, said method comprising:
- exposing graphite fluoride to a halocarbon environment at a temperature between room temperature and 250.degree. C., thereby allowing said halocarbon to diffuse into the lamellar crystal structure of said graphite fluoride so that a first intermediate total system is formed comprising a graphite fluoride-halocarbon mix in a halocarbon environment;
- heating said first intermediate total system to a temperature of between approximately 250.degree. C. and approximately 450.degree. C., thereby substantially defluorinating said graphite fluoride while also permitting said halocarbon to de-halogenate and form chemical bonds with and thereby bridge adjacent graphitic lattice planes within said graphite fluoride and resulting in a first intermediate carbon material containing halogen;
- heating to approximately 650.degree. C. said first intermediate carbon material in an inert environment, thereby producing a fluorine-free second intermediate carbon material;
- heating to a temperature in the range of approximately 1000.degree. C. to 1160.degree. C. said second intermediate carbon material in an inert environment, thereby to produce a final product which is an apparently non-graphtic, chemically modified carbon.
A method of making chemically modified carbon-based materials from a precursor containing graphite fluoride, said method comprising:
- exposing graphite fluoride to a halocarbon environment at a temperature between room temperature and 250.degree. C., thereby allowing said halocarbon to diffuse into the lamellar crystal structure of said graphite fluoride so that a first intermediate total system is formed comprising a graphite fluoride-halocarbon mix in a halocarbon environment;
- heating said first intermediate total system to a temperature of between approximately 250.degree. C. and approximately 450.degree. C., thereby substantially defluorinating said graphite fluoride while also permitting said halocarbon to de-halogenate and form chemical bonds with and thereby bridge adjacent graphitic lattice planes within said graphite fluoride and resulting in a carbon material containing substantially no halogen.
Dependencies are inferred from the claim text.