▎ 摘　　要

NOVELTY - Preparing wave-absorbing stealth composite coating comprises (1) placing iron, silicon, copper, boron and niobium raw material into vacuum smelting furnace, heating, cooling to obtain iron-based amorphous alloy ingot and smelting; (2) preprocessing iron-based amorphous alloy ingot by grinding to remove surface oxide scale and ultrasonic cleaning to form small block; (3) preparing small block body into iron-based amorphous alloy micro-powder by using vacuum atomization method; (4) fully mixing iron-based amorphous alloy micro-powder with graphene micro-powder to obtain iron-based amorphous/graphene composite powder; (5) mixing iron-based amorphous alloy micro powder with graphene micro powder in container containing absolute ethanol and vacuum drying mixture to obtain iron-based amorphous/graphene composite powder; (6) performing cleaning, sandblasting, roughening and preheating treatment on substrate surface; and (7) spraying iron-based amorphous/graphene composite powder on substrate. USE - The method is useful for preparing wave-absorbing stealth composite coating. ADVANTAGE - The method enables to prepare wave-absorbing stealth composite coating in an efficient manner. DETAILED DESCRIPTION - Preparing wave-absorbing stealth composite coating comprises (1) taking iron, silicon, copper, boron and niobium raw material according to mass percentage of Fe-based amorphous alloy; (2) placing raw material into vacuum smelting furnace in the order of high melting point and low melting point, heating to make all melt using argon gas as protective gas, cooling to obtain iron-based amorphous alloy ingot, and repeating smelting to ensure iron-based amorphous alloy ingot component uniform; (3) preprocessing iron-based amorphous alloy ingot by grinding to remove surface oxide scale, and ultrasonic cleaning to form small block; (4) preparing small block body into iron-based amorphous alloy micro-powder by using vacuum atomization method; (5) fully mixing iron-based amorphous alloy micro-powder with graphene micro-powder in a mass ratio of 85-95:5-15 to obtain iron-based amorphous/graphene composite powder; (6) mixing iron-based amorphous alloy micro powder with graphene micro powder, adding into container containing absolute ethanol, fully and uniformly mixing iron-based amorphous alloy micro powder and graphene micro powder through mechanical stirring and ultrasonic oscillation, and vacuum drying mixture to volatilize absolute ethanol to obtain iron-based amorphous/graphene composite powder; (7) performing cleaning, sandblasting, roughening and preheating treatment on the surface of substrate, and making the substrate temperature reach more than 180 degrees C; and (8) spraying iron-based amorphous/graphene composite powder on the substrate processed by using supersonic flame spraying method.