▎ 摘　　要

NOVELTY - Preparing graphene-modified carbon/carbon electric contact comprises (i) using a pre-oxidized silk felt needle as a preform material, and controlling the preform density; (ii) carbonizing the preform; (iii) subjecting the pre-formed body to chemical vapor deposition and densification; (iv) mixing the graphene and diluting with an organic solvent and a resin, and the mixture is uniformly stirred to obtain an impregnation mixture; (v) immersing the impregnation mixture into the porous carbon/carbon composite material body, and the impregnation is carried out, curing, carbonizing, and transferring to the next dense process; (vi) subjecting the carbon/carbon composite material body to high temperature graphitization, and heating, then heating for high temperature graphitization, and naturally cooling; (vii) mixing the carbon/carbon composite material body with graphene and resin, and carrying out immersion, solidification, and carbonization treatment; and (viii) mechanically processing. USE - The method is useful for preparing graphene-modified carbon/carbon electric contact. ADVANTAGE - The graphene-modified carbon/carbon electric contact has excellent mechanical property, high mechanical strength, low resistivity, wear resistance and arc erosion resistance. DETAILED DESCRIPTION - Preparing graphene-modified carbon/carbon electric contact comprises (i) using a pre-oxidized silk felt needle as a preform material, and controlling the preform density at 0.12-0.30 g/cm3; (ii) carbonizing the preform used in the first step; (iii) subjecting the pre-formed body to chemical vapor deposition and densification, and when the density is greater than or equal to 1 g/cm3 , the process proceeds to the next dense process; (iv) mixing the graphene and diluting with an organic solvent and a resin in a certain ratio, where the graphene content is controlled at 0.5-1.2 wt.%, and the mixture is uniformly stirred to obtain an impregnation mixture; (v) immersing the impregnation mixture under pressure into the porous carbon/carbon composite material body after chemical vapor deposition treatment, and the impregnation is carried out for 2-10 hours at 1-5 MPa, curing, carbonizing after the furnace is turned off at 800-1100 degrees C, for 1-4 hours, repeating multiple times, and transferring to the next dense process when the density is greater than or equal to 1.55 g/cm3; (vi) subjecting the carbon/carbon composite material body to high temperature graphitization in a high temperature graphitization furnace, and heating to 1600-2500 degrees C at a heating rate of 5-200 degrees C/hour, then heating for 2-4 hours for high temperature graphitization, and naturally cooling; (vii) mixing the carbon/carbon composite material body after the high temperature graphitization with graphene and resin, and carrying out immersion, solidification, and carbonization treatment; and (viii) mechanically processing the carbon/carbon composite material body.