Process for producing graphite film and graphite film produced thereby

摘要

In order to obtain a graphite film having an excellent thermal diffusivity, a high density, and excellent flatness without flaws, recesses and wrinkles on the surface, the process for producing a graphite film according to the present invention comprises the graphitization step for a raw material film made of a polymer film and/or a carbonized polymer film and/or the post-planar pressurization step for the film in this order to prepare a graphite film, wherein the graphitization step is a step of thermally treating two or more stacked raw material films at a highest temperature of 2,000° C. and includes a method of electrically heating the raw material films themselves and/or a method of thermally treating the films while applying pressure to the films planarly, and the post-planar pressurization step includes a method of planarly pressurizing the one raw material film or the multiple stacked raw material films after graphitization by single-plate press or vacuum press.

主权项

1. A process for producing a graphite film comprising the steps of:
graphitizing a raw material film made of a polymer film and/or a carbonized polymer film; and conducting a post-planar pressurization step after the step of graphitizing, so that a planar pressure is uniformly and simultaneously applied to the graphitized raw material film, wherein the graphitized raw material film is pressurized together with a film-like medium other than the graphitized raw material film in the post-planar pressurization step, thereby reducing wrinkles on the graphitized raw material, the graphitization step includes thermal treatment at a temperature of 2,400° C. or higher, and the raw material film is retained in and in contact with a container that is directly electrified by application of voltage and graphitized while electrifying the container by application of voltage in the graphitization step.