石墨烯复合SiO2材料的制备及其性能研究

Preparation and Properties of Graphene/SiO_2 Materials

以石墨烯和介孔材料SBA-15为原料通过放电等离子体烧结技术(SPS)制备了石墨烯复合氧化硅玻璃陶瓷材料。重点研究了石墨烯不同含量对复合样品结构和性能的影响。结果表明:石墨烯的加入使得复合样品的断面变得粗糙,并且显著提高了样品的力学性能。复合样品的硬度和断裂韧性随着石墨烯含量的增加而增大,当含量为1wt.%时两者可分别达到11.9 GPa和3.36 MPa·m^(1/2),与SBA-15制备的样品相比,两者分别提高了60.4%和43.6%。

Graphene/SiO2 glass-ceramic materials were prepared by spark plasma sintering using graphene and mesoporous material SBA-15 as raw materials. The infuence of different graphene content on the structure and properties of the composite samples was studied. The results show that the fractured surfaces of the composite samples became coarse and the mechanical properties were signifcantly improved due to the addition of graphene. The Vickers hardness and fracture toughness were increased with the increase of graphene content and they reached 11.98GPa and 3.36MPa·m^1/2, respectively, when 1wt.% graphene was added. Compared with the sample prepared with SBA-15, the Vickers hardness and fracture toughness of the composites increased 60.4% and 43.6%, respectively.