石墨烯-Cu/Ti6Al4V复合材料的制备及力学性能

摘要

采用表面无敏化、无活化的化学镀铜法对石墨烯进行表面镀铜,并通过微波烧结法(烧结温度为1000 ℃)制备石墨烯(GNPs)/Ti6Al4V、石墨烯(GNPs)-Cu/Ti6Al4V 复合材料,探讨石墨烯表面镀铜后对钛基复合材料显微组织和性能的影响.结果表明:石墨烯表面成功镀覆一层较均匀分布的铜颗粒,石墨烯与基体Ti界面反应严重,容易生成粒径为2~5 μm的TiC;石墨烯表面镀铜后,界面反应产生的TiC含量增多,同时引入了Ti2Cu相.相比于单纯外加石墨烯,石墨烯表面镀铜后,微量铜降低了烧结温度,提高了复合材料的力学性能,其致密度、显微硬度、压缩强度分别达到96.55%、534HV0.1、1602MPa,室温磨损机制由基体(Ti6Al4V)的磨粒磨损转变为GNPs-Cu/Ti6Al4V复合材料的粘着磨损.%The copper was plated on the surface of the graphene (GNPs) by chemical copper plating method without sensitization and activation, and the (GNPs)/Ti6Al4V and (GNPs)-Cu/Ti6Al4V composites were prepared by microwave sintering at 1000 ℃. The effects of copper plated GNPs on the microstructure and mechanical properites of Ti matrix composites were investigated. The results show that a layer of the uniform distribution of copper particles is successfully covered on the surface of GNPs. The severe interfacial reaction occurred between the GNPs and Ti, leading to the formation of TiC with the particle size of 2?5 μm. After copper plating, the TiC contents at the interface increase, and the new Ti2Cu phase is also generated. Compared to the (GNPs)/Ti6Al4V composites, the sintering temperature of the (GNPs)-Cu/Ti6Al4V decreases, while the mechanical properties is improved. The density, microhardness and compression strength of (GNPs)-Cu/Ti6Al4V can reach up to 96.55%, 534HV0.1 and 1602 MPa, respectively. At the same time, the wear mechanism changes from abrasive wear for Ti6Al4V sample to adhesive wear for (GNPs)-Cu/Ti6Al4V composites.