▎ 摘　　要

NOVELTY - Preparing graphene/aluminum composite material radiating film comprises e.g. (i) uniformly mixing 10-20 pts. wt. concentrated sodium nitrate and 1600-1800 pts. wt. concentrated sulfuric acid, adding 20-40 pts. wt. natural scaly graphite powder, and stirring to fully react; (ii) slowly adding 80-100 pts. wt. potassium permanganate into the mixed solution, stirring uniformly, gradually adding 40% hydrogen peroxide solution to remove residual potassium permanganate; (iii) adding water to dilute the mixture, centrifuging the mixture by a high speed centrifuge to obtain the graphene oxide; (iv) using 10% hydrochloric acid solution and de-ionized water to wash the graphene oxide prepared in the step (iii); until the solution is neutral; filtering and dehydrating in the vacuum drying box to obtain graphene oxide; and(v) adding the graphene oxide after washing in step (iv) into de-ionized water for ultrasonic dispersion; and performing electrophoretic deposition in the electroplating groove. USE - The method is useful for preparing graphene-aluminum composite material radiating film. ADVANTAGE - The composite material radiating film fully uses the two-dimensional plane of graphene to perform phonon transmission, has improved longitudinal thermal conductivity, good uniformity and thickness controllability, large structural strength, high heat conductivity coefficient, uniform heat conduction in each direction, small density, and stable performance. DETAILED DESCRIPTION - Preparing graphene/aluminum composite material radiating film comprises (i) uniformly mixing 10-20 pts. wt. concentrated sodium nitrate and 1600-1800 pts. wt. concentrated sulfuric acid, adding 20-40 pts. wt. natural scaly graphite powder, and stirring to fully react to obtain the mixed solution; (ii) slowly adding 80-100 pts. wt. potassium permanganate into the mixed solution prepared in the step (i), stirring uniformly, gradually adding 40% hydrogen peroxide solution to remove residual potassium permanganate, until the solution becomes tender yellow; (iii) adding water to dilute the mixture obtained in step (ii); centrifuging the mixture by a high speed centrifuge to obtain the graphene oxide; (iv) using 10% hydrochloric acid solution and de-ionized water to wash the graphene oxide prepared in the step (iii); until the solution is neutral; filtering and dehydrating in the vacuum drying box to obtain graphene oxide; (v) adding the graphene oxide after washing in step (iv) into de-ionized water for ultrasonic dispersion; performing electrophoretic deposition in the electroplating groove; using aluminum foil as anode and cathode; electrically depositing for 5-6 minutes under the condition of constant voltage of 30-50 V, forming a gel-like dark film on the surface of the aluminum foil anode, and vacuum drying in a vacuum drying box to obtain a graphene/aluminum composite film; (vi) placing the graphene/aluminum composite film prepared in step (v) into the atmosphere furnace, introducing nitrogen, heating to 300 degrees C thermally insulating for 10-20 minutes, introducing hydrogen, heating to temperature of 500-700 degrees C for annealing heat treatment, after constant temperature insulating for 30-600 minutes, and naturally cooling; and (vii) annealing heat treatment of graphene/aluminum composite film by hot pressing technology, where oil cylinder pressure is 40 MPa, pressing temperature is 600 degrees C, and naturally cooling.