▎ 摘　　要

NOVELTY - Preparation of graphite/carbon nanotube fiber beam/graphene thermally conductive composite film involves putting graphite paper into magnetic boat, ablation oxidizing in tubular furnace, soaking in orthosilicate solvent, air aging, blast-drying, dissolving ferrocene in xylene solution, entering graphite paper in vacuum tubular furnace, filling argon gas, heating, adding graphene oxide powder into deionized water, ultrasonically dispersing adding sample bundle and graphene oxide solution into hydrothermal reaction kettle, moving kettle into muffle furnace, heating and freeze-drying. USE - Method for preparing graphite/carbon nanotube fiber beam/graphene thermally conductive composite film. ADVANTAGE - The composite film has thermal conductivity reaching to 400 W/m-K along plane direction, and 15 W/m-K along thickness direction. DETAILED DESCRIPTION - Preparation of graphite/carbon nanotube fiber beam/graphene thermally conductive composite film comprises: (A) putting graphite paper into magnetic boat, ablation oxidizing in tubular furnace under air atmosphere at 400-500 degrees C, soaking in orthosilicate solvent, air aging and blast-drying at 60-80 degrees C for 18-24 hours surface silica coated graphite paper; (B) dissolving ferrocene in xylene solution to obtain catalyst precursor with concentration of 0.02-0.05 g/mL, entering graphite paper in vacuum tubular furnace, filling argon gas as protective gas, heating to 700-900 degrees C and preserving heat for 20-40 minutes to obtain carbon nanotube fiber beam-graphite paper sample bundle; and (C) adding graphene oxide powder into deionized water, ultrasonically dispersing to obtain graphene oxide solution with concentration of 0.8-1.6 mg/mL, adding sample bundle and graphene oxide solution into hydrothermal reaction kettle, moving hydrothermal reaction kettle into muffle furnace, heating at 170-200 degrees C for 10-14 hours, cooling to room temperature and freeze-drying at - 30 to - 50 degrees C.