Epoxy resin (EP) composites with satisfactory thermal and tribological performance are highly required for engineering moving components. However, the simple addition of fillers leaded to the serious filler agglomeration and limited promotion in tribological properties. In this work, we constructed a new kind of three-dimensional (3D) reduced graphene oxide (RGO)/Si₃N₄ hybrid aerogel for EP composites, which was prepared by a facile hydrothermal self-assembly method followed by freeze-drying technique. As a result, the dispersibility of Si₃N₄ whiskers was greatly improved through wrapping of polydopamine—polyethyleneimine copolymer (PDA—PEI) copolymer and physical spacing of 3D skeleton. Furthermore, benefiting from the synergistic effect of RGO and Si₃N₄@PDA—PEI in the thermal network, the thermal conductivity of RGO/Si₃N₄ hybrid aerogel (GSiA)—EP increased by 45.4% compared to that of the neat EP. In addition, the friction coefficient and wear rate of GSiA—EP decreased by 83.7% and 35.8%, respectively. This work is significant for opening a tribological performance enhancement strategy though constructing 3D hybrid architecture.

工程运动部件非常需要具有令人满意的热性能和摩擦学性能的环氧树脂（EP）复合材料。然而，单纯添加填料会导致填料团聚严重，摩擦性能提升有限。在这项工作中，我们构建了一种用于EP复合材料的新型三维（3D）还原氧化石墨烯（RGO）/Si ₃ N ₄杂化气凝胶，该气凝胶通过简便的水热自组装方法和冷冻干燥技术制备而成。其结果是，Si ₃ N _{4的分散性}通过聚多巴胺-聚乙烯亚胺共聚物（PDA-PEI）共聚物的包裹和3D骨架的物理间隔，晶须得到了极大的改善。此外，受益于RGO和Si ₃ N ₄ @PDA-PEI在热网络中的协同效应，RGO/Si ₃ N ₄杂化气凝胶(GSiA)-EP的导热系数较纯气凝胶提高了45.4%。 EP。此外，GSiA-EP的摩擦系数和磨损率分别降低了83.7%和35.8%。这项工作对于通过构建 3D 混合架构开启摩擦学性能增强策略具有重要意义。