▎ 摘　　要

NOVELTY - Producing (I) graphitic film, comprises: (a) mixing graphene platelets with a carbon precursor polymer and a liquid to form a slurry or suspension and forming the slurry or suspension into a wet film under the influence of an orientation-inducing stress field to align the graphene platelets on a solid substrate; (b) removing the liquid from the wet film to form a precursor polymer composite film; (c) carbonizing the precursor polymer composite film at a carbonization temperature of at least 300 degrees C to obtain a carbonized composite film; and (d) thermally treating the carbonized composite film. USE - The process is useful for producing graphitic film which is used in an electronic device as a heat-dissipating element (claimed). ADVANTAGE - The process: provides graphitic film that exhibits an inter-graphene spacing less than 0.337 nm and a mosaic spread value less than 1 (preferably less than 0.4), degree of graphitization no less than 60% (preferably less than 90%) and/or a mosaic spread value less than 0.7 (all claimed) and exhibits a combination of exceptionally high thermal conductivity, high electrical conductivity, and high mechanical strength; and significantly lowers heat treatment temperatures, shortens heat treatment time and lowers amount of energy consume, thus cost-effective. DETAILED DESCRIPTION - Producing (I) graphitic film, comprises: (a) mixing graphene platelets with a carbon precursor polymer and a liquid to form a slurry or suspension and forming the slurry or suspension into a wet film under the influence of an orientation-inducing stress field to align the graphene platelets on a solid substrate, where the graphene platelets are pristine graphene, oxidized graphene, reduced graphene oxide, fluorinated graphene, hydrogenated graphene, doped graphene and/or chemically functionalized graphene, and the carbon precursor polymer is polyimide, polyamide, polyoxadiazole, polybenzoxazole, polybenzobisoxazole, polythiazole, polybenzothiazole, polybenzobisthiazole, poly(p-phenylene vinylene), polybenzimidazole and/or polybenzobisimidazole; (b) removing the liquid from the wet film to form a precursor polymer composite film, where the graphene platelets occupy a weight fraction of 1-99% based on the total dried precursor polymer composite weight; (c) carbonizing the precursor polymer composite film at a carbonization temperature of at least 300 degrees C to obtain a carbonized composite film; and (d) thermally treating the carbonized composite film at a final graphitization temperature higher than 1500 degrees C to obtain the graphitic film. INDEPENDENT CLAIMS are also included for: (1) producing (II) graphitic film comprising (a1) mixing graphene sheets with a carbon precursor material and a liquid to form a slurry or suspension and forming the slurry or suspension into a wet film under the influence of an orientation-inducing stress field to align the graphene platelets, (b1) removing the liquid to form a graphene platelet-filled precursor composite, (c1) carbonizing the precursor composite film at a carbonization temperature of at least 500 degrees C to obtain a carbonized composite film, and step (d) as above per se, where the carbon precursor material has a carbon yield of less than 70%; (2) producing (III) graphitic film, comprising (a2) mixing expanded graphite flakes with a carbon precursor material and a liquid to form a slurry and forming the slurry into a wet film under the influence of an orientation-inducing stress field to align the expanded graphite flakes, (b2) removing the liquid to form an expanded graphite flake-filled precursor composite film where the expanded graphite flakes occupy a weight fraction of 1-99% based on the total precursor composite weight, (c2) carbonizing the precursor composite film at a carbonization temperature of at least 300 degrees C to obtain a carbonized composite film, and (d2) thermally treating the carbonized composite film at a final graphitization temperature higher than 1500 degrees C to obtain the graphitic film; and (3) the graphitic film produced by the process.