▎ 摘　　要

NOVELTY - Preparing cobalt nickel-graphene composite wave absorbing material comprises (i) taking cobaltous nitrate hexahydrate, nickel(II) nitrate hexahydrate and tetrasodium ethylenediaminetetraacetate as raw materials to obtain cobalt/nickel precursor by hydrothermal method, (ii) dissolving graphene and cobalt/nickel precursor in ultrapure water, ultrasonically dispersing for 2 hours to obtain suspension, adding hydrazine hydrate, and transferring into the autoclave, placing in a vacuum drying oven, heating at 200 degrees C for 24 hours, and cooling to room temperature, washing repeatedly with deionized water and ethanol to neutrality, and drying at 60 degrees C to obtain cobalt/nickel-graphene oxide composite material, and (iii) placing cobalt/nickel-graphene oxide composite material in tube furnace under nitrogen atmosphere, and heating at 700 degrees C for 5-6 hours to obtain final product. USE - The method is useful for preparing cobalt nickel-graphene composite wave absorbing material. ADVANTAGE - The composite wave absorbing material has frequency band width of 12.2 GHz, maximum reflection loss of up to 46.3 dB (13.8 GHz), and low density. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for cobalt-nickel-graphene composite absorbing material obtained by above method.