▎ 摘　　要

NOVELTY - Artificial graphite powder formed by crushing carbonized, graphitized and foamed graphite sheets, and laminating multiple graphene layers in the thickness direction by the foaming gap, is claimed. Each of the graphene layers has an uneven surface. USE - Used as artificial graphite powder. ADVANTAGE - The artificial graphite powder expands to increase the volume-to-volume space inside and increase the external surface area by the uneven surface, increases thermal conductivity in the thickness direction, can be pressed a lot during pressure molding, has improved electrical conductivity and mechanical strength, and is easy to provide graphite sheets of various shapes, easy to handle and provides uniform quality, and economical. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) artificial graphite-metal composite powder formed by forming a metal layer on artificial graphite powder, in which the metal layer is formed on the surfaces of both graphene layers in the thickness direction by plating, and the plating solution is formed by penetrating along at least a portion of the gap during plating; (2) a compressed artificial graphite-metal composite powder compressed at least 20% of its original thickness under pressure by a press; (3) heat transfer composite sheet produced by adding artificial graphite-metal composite powder or the compressed artificial graphite-metal composite powder in a mold, forming a molded body with a certain shape by applying force, reducing the molded body to a reducing atmosphere at a temperature near the temperature at which the metal layer is melted, melting and connecting the metal layers to each other; and (4) producing artificial graphite powder, comprising (a) putting a rolled polyimide film into a thermal decomposition furnace to form a carbonized film in which only carbon and a blowing agent remain, (b) taking out the carbonized film, introducing in a thermal decomposition furnace, and raise the temperature to volatilize the remaining foaming agent so that the carbonized film is expanded and graphitized to form a graphitized expanded film, (c) pulverizing the graphitized expanded film with a grinder using a blade to form a powder, and (d) classifying the powder so that it has a relatively uniform size.