▎ 摘　　要

NOVELTY - A thermally conductive and wave-absorbing silica gel composite material comprises a magnetic and heat-conducting wave-absorbing material formed by oriented arrangement of magnetic boron nitride nanosheets, thermally conductive powder, and MXene nanosheets as raw materials. USE - Thermally conductive and wave-absorbing silica gel composite material. ADVANTAGE - The thermally conductive and wave-absorbing silica gel composite material has excellent thermal conductivity of boron nitride, and low filling ratio. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the thermally conductive and wave-absorbing silica gel composite material, which involves configuring the ferroferric oxide precursor liquid, adding the boron nitride nanosheets to the precursor liquid for reaction mixing, washing, and drying to obtain ferroferric oxide boron nitride nanosheets with uniform surface dispersion, adding lithium fluoride to hydrochloric acid solution and stirring to prepare an etching solution containing hydrofluoric acid, and then adding MAX-phase titanium-aluminum-carbide (Ti3AlC2) to the etching solution for stirring, centrifuging, cleaning, ultrasonically processing, filtering, and drying to prepare MXene nanosheets, adding the boron nitride nanosheets, MXene nanosheets, silicone oil, thermally conductive powder, coupling agent, curing agent, inhibitor containing ferroferric oxide on the surface to the homogenizer and mixing well, and then adding catalyst for secondary mixing to form a base material with good fluidity, placing the composite base material in a magnetic field, aligning the magnetic boron nitride along the direction of the magnetic field, after the orientation is completed, and heating the base material and solidifying.