▎ 摘　　要

NOVELTY - A carbon foam comprises graphene coating whose thickness is 0.5-5 mu m. The proportion of graphene in coating is 20-30%. The difference between coefficient of thermal expansion of carbon foam matrix and coefficient of thermal expansion of graphene-containing coating is less than 15%. The diameter of carbon foam cell is 50-200 mu m, thermal conductivity is 0.036-0.685 W/(mK), density is 4.57-9.62 kg/m3, compressive strength is 5-15 MP, porosity is greater than 96. The BET specific surface area is greater than 250-600 m2/g. USE - Carbon foam used in catalyst carrier and heat insulating material. ADVANTAGE - The carbon foam has high mechanical properties, high thermal insulation properties, large specific surface area, rich functional groups, and wide application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of carbon foam, which involves washing melamine formaldehyde foam, washing with 10 %mass aqueous ammonia solution, washing with distilled water, placing in oven at 50-70 degrees C for 6-8 hours, dispersing graphene powder in water, ultrasonically oscillating for 1-3 hours to form graphene aqueous solution where graphene mass fraction is 5-10% and graphene is 3500 mesh graphene oxide, adding graphene aqueous solution to resin solution, mechanically stirring at 500-1000 rpm for 1-2 hours, ultrasonically oscillating for 1-2 hours to obtain uniformly dispersed mixed solution having viscosity of 5-8 mPa.second, where resin is phenolic resin and epoxy resin, placing treated melamine formaldehyde foam in mixed solution for vacuum pressurization at 0.5-2 MPa for 1-3 hours, placing melamine formaldehyde resin foam in oven and drying at 80-150 degrees C for 6-10 hours, placing dried melamine formaldehyde resin foam in vacuum pyrolysis furnace for pyrolysis at vacuum degree of 1-100 Pa using flowing argon gas as shielding gas, heating at 450-600 degrees C and rate of 1-5 degrees C/minute, heat preserving for 1-3 hours, and cooling with the furnace.