▎ 摘　　要

NOVELTY - Preparation of composite structure wave absorbing material involves soaking carbon fibers in ferric nitrate solution, taking out, drying, immersing carbon fibers in mixed solution of boric acid, urea and melamine, infiltrating, drying to obtain boron carbon nitride/iron oxide-doped preform monofilament fibers, compacting the monofilament fibers into shape of a preform, needle punching, pulling out a portion of horizontal fibers to vertical direction through the hook, entangling fibers in vertical direction and the fibers in the horizontal direction with each other to obtain preform component with high strength, vacuum impregnating the preform component in organic mixed solvent of graphene, asphalt and n-hexane using vacuum impregnating machine, then vacuuming to obtain impregnated sample, curing to obtain cured sample, cracking the cured sample to obtain wave absorbing material, and repeating above steps for several times until weight gain of wave absorbing material is less than 1%. USE - Preparation of boron carbon nitride/iron oxide-doped fibers/carbon composite structure wave absorbing material for mobile communication application. ADVANTAGE - The prepared composite structure wave absorbing material is thin and has excellent high-temperature wave absorption and mechanical bearing integrated performance and mechanical property. DETAILED DESCRIPTION - Preparation of composite structure wave absorbing material involves (s1) soaking carbon fibers in ferric nitrate solution, taking out, drying, (s2) immersing carbon fibers in mixed solution of boric acid, urea and melamine, infiltrating, drying to obtain boron carbon nitride/iron oxide-doped preform monofilament fibers, (s3) compacting the monofilament fibers into shape of a preform, needle punching, pulling out a portion of horizontal fibers to vertical direction by the hooking action, entangling fibers in vertical direction and the fibers in the horizontal direction with each other to obtain preform component with high strength and compact structure, (s4) vacuum impregnating the preform component in organic mixed solvent of graphene, asphalt and n-hexane using vacuum impregnating machine, then vacuuming to obtain impregnated sample, (s5) curing to obtain cured sample, (s6) cracking the cured sample to obtain wave absorbing material, (s7) repeating the steps (s4)-(s6) for several times until the weight gain of the wave absorbing material is less than 1% to obtain boron carbon nitride/iron oxide-doped fibers/carbon (BCN/FexOy:Cf/C) composite structure wave absorbing material.