▎ 摘　　要

NOVELTY - Preparing porous carbon-rich silicon-carbon-nitrogen ceramic wave-absorbing heat-conducting material, comprises measuring graphene oxide aqueous solution, reducing agent and antifreezing agent, magnetically stirring, and ultrasonically dispersing to obtain mixed solution, reducing the mixed solution in a sealed oven to obtain a three-dimensional reduced graphene oxide hydrogel, placing the three-dimensional reduced graphene oxide hydrogel into an ethanol/water mixed solution for aging, and freeze-drying, measuring the polymer-converted ceramic precursor and organic solvent in a container, stirring, placing the graphene aerogel into a mixed solution of a polymer converted ceramic precursor and an organic solvent, drying and impregnating in a vacuum, pre-freezing, freeze-drying, heat-treating three-dimensional graphene composite material coated with the ceramic precursor solution, and cross-linking and curing and pyrolysis at high temperature. USE - The method is useful for preparing porous carbon-rich silicon-carbon-nitrogen ceramic wave-absorbing heat-conducting material. ADVANTAGE - The method enables to prepare porous carbon-nitrogen-carbon nitrogen ceramic wave-absorbing heat-conducting material, which improves the radiating performance of the whole material, and improves the impedance matching capability of the material. The three-dimensional network with interconnections has excellent heat-conduction performance to greatly improve the radiation performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for porous carbon-rich silicon-carbon-nitrogen ceramic wave-absorbing and heat-conducting material.