▎ 摘　　要

NOVELTY - Preparing graphene composite wave absorbing material sol comprises providing water-soluble iron salt and water-soluble barium salt according to the formula of BaFe12O19, orderly dissolving water-soluble iron salt and water-soluble barium salt in deionized water to obtain iron salt solution and barium salt solution, uniformly mixing iron salt solution and barium salt solution to obtain precursor solution, dispersing 0.1-0.9 mg/ml graphene-based material in deionized water to obtain graphene dispersed aqueous solution, orderly adding citric acid complexing agent, dilute nitric acid, and graphene dispersed aqueous solution to precursor solution, adjusting pH to 3-7, reacting at 50-75 degrees C to obtain the graphene composite wave absorbing material sol. USE - The graphene composite wave absorbing material sol is useful in wave-absorbing coating (claimed). ADVANTAGE - The method has simple and easy process, consumes less energy, and meets industrialized production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the preparation of wave-absorbing coating comprising aging the graphene composite wave-absorbing material sol 24 hours, uniformly coating on the substrate surface, drying at 60-100 degrees C, removing, irradiating with low-power laser to obtain coating precursor, and sintering the coating precursor under high-power laser to obtain the wave-absorbing coating.