▎ 摘　　要

NOVELTY - Preparation of oxide-graphene-coated nickel-cobalt alloy particle composite material involves sintering oxidized graphite in water to an oxidized graphene sheet and obtaining a stable dispersion, dripping an aqueous solution of hydrazine hydrate, stirring, vacuum-drying and obtaining graphene oxide, mixing carbonyl nickel and carbonyl cobalt, adding mixture to the carrier liquid and surfactant mixture, then adding gamma -aminopropyltriethoxysilane, dripping fused graphene solution into a mixed solution of carbonyl nickel and carbonyl cobalt, filtering, and vacuum-drying. USE - Preparation of oxide-graphene-coated nickel-cobalt alloy particle composite material (claimed). ADVANTAGE - The method efficiently and economically provides oxide-graphene-coated nickel-cobalt alloy particle composite material with high conductivity, excellent magnetic properties and temperature stability, high acid resistance, alkali resistance, oxidation resistance, effective absorptivity of 9.5-14.6GHz, and maximum absorption value of 16.5dB when the thickness is 1.5 mm. DETAILED DESCRIPTION - Preparation of oxide-graphene-coated nickel-cobalt alloy particle composite material involves adding graphite powder into a beaker, then adding concentrated nitric acid, concentrated sulfuric acid and potassium permanganate, ultrasonically-treating for 10 minutes, washing with deionized water three times, adding concentrated ammonia and ultrasonically-dispersing for 10 minutes, centrifuging for 2 times, then adding hydrogen peroxide solution and ultrasonically-dispersing for 10 minutes, centrifuging, adding concentrated hydrochloric acid and ultrasonically-dispersing for 10 minutes, washing twice, then adding anhydrous ethanol and ultrasonically-dispersing for 10 minutes, pumping three times, drying at 90-110 degrees C and obtaining oxidized graphite, sintering oxidized graphite in water for 1 hour to an oxidized graphene sheet and obtaining a stable dispersion, dripping an aqueous solution of 80% hydrazine hydrate, stirring, heating to 100 degrees C, finally vacuum-drying at 60 degrees C for 12 hours and obtaining graphene oxide, mixing carbonyl nickel and carbonyl cobalt, adding mixture to the carrier liquid and surfactant mixture, then adding 1 mL gamma -aminopropyltriethoxysilane as surface-treatment agent, ultrasonically-treating for 0.5 hours, supplying vacuum and nitrogen for several times and obtaining a mixture of homogeneous carbonyl nickel and carbonyl cobalt mixed solution, dripping fused graphene solution into a mixed solution of carbonyl nickel and carbonyl cobalt, controlling flow of graphene oxide to 3-5 drops per second, stirring, repeating vacuum and nitrogen filling operation several times and heating, observing gas emergence slowly when the temperature is increased to 60 degrees C, thermally-decomposing mixed solution, cooling the reactor, transferring product into the flask and centrifugally-precipitating, filtering the excess mixture of solvent, and vacuum-drying.