钛合金(TC4)具有良好的生物相容性、优异的力学性能及耐腐蚀等优点, 因此被作为医用人工关节材料, 但其较差耐磨损性能限制了其在临床医学应用方面的应用和发展。本文通过填充碳纳米管(CNTs), 采用激光增材制造(3D打印)技术成形CNTs/TC4复合材料, 并通过金相显微镜和排水法对其微观结构组织、孔隙率进行了研究, 并在模拟体液环境下, 对其生物摩擦学性能进行了分析。结果表明: 填充CNTs可以显著提高TC4基底的显微硬度, 当w(CNTs)=1.0%时, 显微硬度较纯TC4(328.3 HV0.2)提高了31.82%, 且随着CNTs含量的增加, CNTs/TC4复合材料的孔隙率逐渐增加, 其中1.5-CNTs/TC4孔隙率最大为9.64%, 而磨损体积却随着孔隙率的增加逐渐降低。

Titanium alloy (TC4) has been widely used as an artificial joint material due to its good biocompatibility, excellent mechanical properties and corrosion resistance. However, its poor wear resistance limits its application and development in clinical medical applications. In this paper, carbon nanotubes (CNTs) were filled, CNTs/TC4 nocomposites were manufactured by laser additive manufacturing technology (3D printing). The microstructure and porosity of the composites were studied by metallographic microscope and drainage method. Furthermore,the biotribological properties were analyzed under the condition of simulated body fluid. The results show that the addition of CNTs can significantly improve the microhardness of TC4 substrate. When w(CNTs)=1.0%, the microhardness value is 31.82% higher than that of pure TC4 (328.3 HV0.2), and the porosity of CNTs/TC4 nacomposites are increased gradually with the increase of CNTs content, while the wear volume is decreased, and in which the maximum porosity is 1.5-CNTs/TC4 sample with the value of 9.64%.