Abstract: A method was developed and proposed to fabricate graphene-enhanced hollow microlattice materials, which include the three-dimensional (3D) printing, nanocomposite electroless plating, and polymer etching technologies. The surface morphology and uniformity of as-deposited coatings were systematically characterized and analyzed. Moreover, the mechanical properties of the microlattices were investigated through quasi-static compression tests. The results demonstrated that a uniform Nickel-phossphorous-graphene (Ni-P-G) coating was obtained successfully, and the specific modulus and strength were increased by adding graphene into the microlattice materials. The optimal mass concentration of graphene nanoplatelets was obtained after comparing the specific modulus and strength of the materials with different densities of graphene, and the strength mechanism was discussed.

Key words: hollow microlattice, graphene, porous materials, electroless, mechanical properties

摘要： 提出一套石墨烯增强空心微点阵材料的制备方法和工艺技术，主要包括3D打印、纳米复合镀和聚合物蚀刻等先进制造技术。系统地表征和分析了石墨烯增强金属镀层的微观组织形貌和均匀性，并开展了准静态压缩试验，研究了石墨烯增强空心微点阵材料的力学性能。试验结果表明，归功于纳米材料物理和化学分散工艺的综合应用，成功获得了均匀的镍-磷-石墨烯（Ni-P-G）镀层，从而提高了空心微点阵材料的比模量和比强度。在此基础上，对比分析了石墨烯含量对空心微点阵材料力学性能的影响规律，得到了较优的石墨烯含量，并结合细观力学分析模型，揭示了石墨烯对空心微点阵材料弹性模量和强度的影响机理。

关键词: 空心微点阵；石墨烯；多孔材料；化学镀；力学性能