Carbon wave-absorbing material and preparation method thereof

The invention relates to a carbon wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps 1) grinding medium-temperature asphalt into powder, adding polyferric chloride colloid, stirring and mixing, further stirring and mixing after heating melting, and cooling to obtain modulated asphalt; 2) heating the modulated asphalt obtained in the step1) to 500-600 DEG C under the condition of air isolation, removing volatile components to obtain a coking material, and grinding the coking material to obtain carbon powder; and 3) impregnating the carbon powder obtained in the step 2) with an excessive amount of a sodium hydroxide solution, boiling, washing, drying, heating at 300-500 DEG C under the condition of air isolation, and cooling to obtain the carbon wave-absorbing material. According to the carbon wave-absorbing material prepared by the invention, ferrite is used as an inner core, and a carbonaceous shell formed after asphalt is coked covers the ferrite. T