▎ 摘　　要

NOVELTY - An absorbing material is prepared by mixing 60-80 wt.% ferrite and 20-40 wt.% nano silver-graphene, and ball-milling for 2-3 hours with grain diameter of less than or equal to 2 mu m in which nano silver-graphene composite material is obtained by adding graphene oxide into deionized water with mass ratio of 0.005-0.02:1, ultrasonic dispersing for 2-4 hours to obtain graphene oxide dispersing liquid, adding 2 M silver nitrate solution and polyvinylpyrrolidone, magnetic stirring for 1-2 hours, raising temperature at 40-60 degrees C, and adding 0.5 M hydrazine hydrate solution under magnetic stirring. USE - Preparation of absorbing material (claimed). ADVANTAGE - Preparation process is simple and low cost, absorbing material has improved efficiency, stable performance, thin thickness, and corrosion resistance, nano silver-graphene has generated eddy current loss, and graphene has excellent electrical conductivity and thermal conductivity. DETAILED DESCRIPTION - An absorbing material is prepared by mixing 60-80 wt.% ferrite and 20-40 wt.% nano silver-graphene, and ball-milling for 2-3 hours with grain diameter of less than or equal to 2 mu m in which nano silver-graphene composite material is obtained by adding graphene oxide into deionized water with mass ratio of 0.005-0.02:1, ultrasonic dispersing for 2-4 hours to obtain graphene oxide dispersing liquid, adding 2 M silver nitrate solution and polyvinylpyrrolidone, magnetic stirring for 1-2 hours, raising temperature at 40-60 degrees C, adding 0.5 M hydrazine hydrate solution under magnetic stirring, reacting for 30-50 minutes, adjusting pH to 5-6 using 2-5 mass% ammonia aqueous solution, centrifuging product, separating, washing with deionized water and ethanol for 2-3 times, and drying in which mass ratio of graphene oxide dispersing liquid and silver nitrate solution is 1-3:1, mass ratio of polyvinylpyrrolidone and silver nitrate solution is 0.05-0.15:1, and mass ratio of hydrazine hydrate solution and silver nitrate solution is 0.1-0.5:1.