A layer-by-layer ordered-orienting hybrid network was fabricated to enhance thermal conductivity by the size synergy of hydroxyl functionalized hexagonal boron nitride (h-BN), graphene (rGO) and carbon nanotubes (CNT). Firstly, modify the hexagonal boron nitride (h-BN) with tannic acid (TA) to improve its dispersibility and stability in EP coatings, and then mix the modified h-BN (TA@BN) with rGO and CNT to fabricate the composite coatings for thermal enhancement. When the volume of composite fillers is 46 %, the thermal conductivity of the TA@BN-rGO-CNT/EP composite coating is up to 5.65 W·(m⁻¹ K⁻¹), which is 22.6 times higher than that of the blank EP coating (0.25 W·(m⁻¹ K⁻¹)). The enhanced thermal conductivity is attributed to the impact of gravity and structural complementarity between TA@BN, rGO and CNT, sequentially distributing homogeneously in EP matrix, and thus form ordered-orienting heat conduction path to reduce phonon scattering as well as interface thermal resistance. This desired thermal conductivity enhancement in composite coatings has practical applications for the cases of rapid heat-dissipation.

通过羟基官能化六方氮化硼 (h-BN)、石墨烯 (rGO) 和碳纳米管 (CNT) 的尺寸协同作用，制造了逐层有序取向的混合网络以提高导热性。首先，用单宁酸（TA）改性六方氮化硼（h-BN）以提高其在EP涂层中的分散性和稳定性，然后将改性的h-BN（TA@BN）与rGO和CNT混合制备复合涂层用于热增强。当复合填料的体积为46%时，TA@BN-rGO-CNT/EP复合涂层的热导率高达5.65 W·(m ^-1  K ^-1 )，是传统涂层的22.6倍。空白 EP 涂层 (0.25 W·(m ^-1  K ^-1））。增强的热导率归因于TA@BN、rGO和CNT之间的重力和结构互补性的影响，依次均匀分布在EP基体中，从而形成有序定向的热传导路径，以减少声子散射和界面热阻。复合涂层中这种所需的导热性增强对于快速散热的情况具有实际应用。