▎ 摘　　要

NOVELTY - A silicon carbide/hafnium carbide nanowire modified silicon carbide coating reinforced graphene honeycomb-based nano aerogel heat-insulating and wave-absorbing composite material comprises silicon carbide coating enhanced graphene honeycomb, silicon carbide/hafnium carbide nanowires and nano aerogel. The graphene honeycomb in the silicon carbide coating enhanced graphene honeycomb is composed of regular hexagonal or regular triangle units, where the unit side length is 0.1-1.0 cm, and the graphene honeycomb density is 0.3-0.5 g/cm3. The silicon carbide coating is prepared on the surface of graphene honeycomb by chemical vapor deposition process, and it is distributed discontinuously. The thickness of silicon carbide coating is 1.0-1.5 mum. USE - Silicon carbide/hafnium carbide nanowire modified silicon carbide coating reinforced graphene honeycomb-based nano aerogel heat-insulating and wave-absorbing composite material ADVANTAGE - The silicon carbide coating reinforced graphene-based nano-gas gel heat-insulating wave-absorbing composite material is lightweight, and has high strength, bearing, heat insulation and wave absorbing integrated ceramic-based composite material, and effectively blocks the transmission of heat and promotes the absorption and dissipation effect of the electromagnetic wave, and synergistically provides heat insulating wave absorbing wave absorbing performance of the composite material. DETAILED DESCRIPTION - A silicon carbide/hafnium carbide nanowire modified silicon carbide coating reinforced graphene honeycomb-based nano aerogel heat-insulating and wave-absorbing composite material comprises silicon carbide coating enhanced graphene honeycomb, silicon carbide/hafnium carbide nanowires and nano aerogel. The graphene honeycomb in the silicon carbide coating enhanced graphene honeycomb is composed of regular hexagonal or regular triangle units, where the unit side length is 0.1-1.0 cm, and the graphene honeycomb density is 0.3-0.5 g/cm3. The silicon carbide coating is prepared on the surface of graphene honeycomb by chemical vapor deposition process, and it is distributed discontinuously. The thickness of silicon carbide coating is 1.0-1.5 mum. The carbonized slicon/hafnium carbide nanowires were prepared by chemical liquid vapor deposition process in the internal pores of silicon carbide coating-enhanced graphene honeycomb and non-lap winding. The nano aerogel is composed of a graphene-crosslinked carbon hollow sphere aerogel, which is prepared on the surface of silicon carbide/hafnium carbide nanowires by sol-gel process, supercritical drying technology and carbonization reaction and has density of 40.0-50.0 mg/cm3 and specific surface area of 650.0-800.0 m2/g. An INDEPENDENT CLAIM is included for preparation of the composite material comprising: (A) placing untreated graphene honeycomb in the center of the glass container of the liquid phase furnace to be fixed, adding liquid xylene, heating to 800-900degreesC for 6.0-7.0 hours, cooling, taking out for cleaning, and drying at 80-90degreesC; (B) loading into the vapor deposition furnace to be evacuated and checked for air tightness, introducing argon, hydrogen, and trichloromethylsilane, depositing at 1200-1300degreesC for 1-6 hours, and cooling; (C) placing in an aqueous solution of nickel nitrate with a mass fraction of 10.0-40.0%, soaking for 2.0-4.0 hours, taking out, drying at 80-90degreesC, placing in the liquid phase in the glass container of the furnace, pouring mixed solution of xylene, polycarbosilane and organo-hafnium polymer, heating to 800-900degreesC for 5.0-7.0 hours, repeating deposition for 2-4 times, cooling, washing with water, and drying at 80-90degreesC; and (D) dissolving polyaniline-polypyrrole copolymer precursor in graphene oxide suspension, ultrasonically treating for 0.5-1.0 hour, adding ascorbic acid, standing for 8.0-10.0 hours, putting the silicon carbide/hafnium carbide nanowire modified silicon carbide coating into the solution to enhance the graphene honeycomb, replacing with ethanol for solvent replacement, supercritical drying, reacting at 950-1050degreesC for 12-14 hours, and cooling.