School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China.
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China.
Sci Rep. 2017 Feb 7;7:41896. doi: 10.1038/srep41896.
Graphene with ultrahigh intrinsic strength and excellent thermal physical properties has the potential to be used as the reinforcement of many kinds of composites. Here, we show that very high tensile strength can be obtained in the copper matrix composite reinforced by reduced graphene oxide (RGO) when micro-layered structure is achieved. RGO-Cu powder with micro-layered structure is fabricated from the reduction of the micro-layered graphene oxide (GO) and Cu(OH) composite sheets, and RGO-Cu composites are sintered by spark plasma sintering process. The tensile strength of the 5 vol.% RGO-Cu composite is as high as 608 MPa, which is more than three times higher than that of the Cu matrix. The apparent strengthening efficiency of RGO in the 2.5 vol.% RGO-Cu composite is as high as 110, even higher than that of carbon nanotube, multilayer graphene, carbon nano fiber and RGO in the copper matrix composites produced by conventional MLM method. The excellent tensile and compressive strengths, high hardness and good electrical conductivity are obtained simultaneously in the RGO-Cu composites. The results shown in the present study provide an effective method to design graphene based composites with layered structure and high performance.
具有超高本征强度和优异热物理性能的石墨烯有望被用作多种复合材料的增强体。在这里，我们表明，当实现微层结构时，在还原氧化石墨烯（RGO）增强的铜基复合材料中可以获得非常高的拉伸强度。通过还原微层状氧化石墨烯（GO）和 Cu（OH）复合片制备了具有微层结构的 RGO-Cu 粉末，然后通过火花等离子烧结工艺烧结 RGO-Cu 复合材料。5vol.%RGO-Cu 复合材料的拉伸强度高达 608MPa，比铜基体高出三倍以上。2.5vol.%RGO-Cu 复合材料中 RGO 的表观强化效率高达 110，甚至高于传统 MLM 方法制备的铜基复合材料中的碳纳米管、多层石墨烯、碳纳米纤维和 RGO。RGO-Cu 复合材料同时具有优异的拉伸和压缩强度、高硬度和良好的导电性。本研究结果为设计具有层状结构和高性能的基于石墨烯的复合材料提供了一种有效方法。
