CPC C01B 32/198 (2017.08) [B01J 13/0008 (2013.01); B05D 1/005 (2013.01); B05D 3/066 (2013.01); C01B 32/194 (2017.08); B05D 2202/25 (2013.01); C01P 2006/90 (2013.01)] | 11 Claims |
1. A method for preparing a graphene based composite wave-absorbing material, comprising:
dissolving a water soluble barium salt and a water soluble iron salt into deionized water to form a barium salt solution and an iron salt solution, respectively;
mixing the barium salt solution and the iron salt solution according to a molar ratio of Ba:Fe of 1:12 to obtain a precursor solution having a metallic ion concentration in a range of 0.1 to 1.0 mol/L;
dispersing a graphene material in deionized water to form a graphene dispersion having a concentration of 0.1 to 0.9 mg/mL;
adding citric acid, nitric acid and the graphene dispersion into the precursor solution in sequence to form a mixture solution;
stirring the mixture solution at a temperature of 50 to 75° C. to obtain a sol;
aging the sol for 18 to 42 h;
coating the sol on a substrate and drying the sol at a temperature of 60 to 100° C. to obtain a coating layer; and
sintering the coating layer by a laser irradiation having a laser power ranging from 90 to 200 W and an irradiation period of 3 s to 20 s to obtain the graphene based composite wave-absorbing material comprising a compound of a formula of BaFe12O19 and graphene.
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