▎ 摘　　要

NOVELTY - The utility model claims a high radiating performance of the heat exchanger, comprising a fin and is inserted in the fin heat exchange tube, the heat exchanging tube comprises an inner surface of the heat exchange tube body, the tube body and the outer surface are separately provided with graphite heat conducting coating; the outer surface of the heat exchange tube in the inner surface of the heat-conducting coating of graphene further a silicon nitride coating. Graphene and silicon nitride has excellent conductivity, by adding graphite heat-conducting coating and a silicon nitride coating can effectively improve the heat conducting performance of the heat exchanger. the silicon nitride coating on the heat exchange tube inner surface of most outside, also can effectively use the corrosion resistance of silicon nitride coating layer, graphite heat-conducting coating is also good for improving heat exchanger in heat exchange tube strength.