▎ 摘　　要

NOVELTY - Preparation of silicon carbide nanowire/graphene foam electromagnetic wave absorbing composite material comprises adding graphene oxide powder to deionized water, placing in ultrasound for 8-10 minutes to obtain 5mg/ml graphene oxide dispersion, adding sodium bisulfite to graphene oxide dispersion, mixing for 25-30 minutes, placing in high pressure reactor at 180-185 degrees C for 12-13 hours to obtain graphene hydrogel, soaking graphene hydrogel in absolute ethanol solution of 0.05 mol/L nickel (II) nitrate, performing solvent replacement for 1 week to obtain graphene ethanol gel, placing graphene ethanol gel in supercritical drying kettle, drying at 270 degrees C under 8 MPa to obtain graphene foam, keeping graphene foam at 1100-1150 degrees C for 4-5 hours and cooling to room temperature under hydrogen atmosphere. The mass ratio of graphene oxide in sodium bisulfite and graphene oxide dispersion is 11:14-15. The volume ratio of hydrogen gas and methyltrichlorosilane in mixed atmosphere is 1:4. USE - Method of preparing silicon carbide nanowire/graphene foam electromagnetic wave absorbing composite material. ADVANTAGE - The material is light in weight, has high strength and improves thermal stability and electromagnetic wave absorption performance.