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制备Ti6Al4V/20CoCrMo与多孔Ti6Al4V生物医用双层复合材料.采用传统粉末冶金技术,以半固态烧结为固结步骤,制备具有致密Ti6Al4V/20CoCrMo表层和多孔Ti6Al4V底层的双层样品,以更好地模拟天然骨.采用膨胀法研究双层试样的致密化行为,通过扫描电镜(SEM)和显微计算机断层成像(CMT)观察其显微组织,并分别通过压缩试验和动电位试验评价其力学性能和耐腐蚀性能.结果表明,在界面对致密化无负面影响的情况下,可得到无裂纹的双层样品.多孔层的渗透率值在较低的人体骨骼的渗透率范围内.样品的压缩特性由Ti6Al4V多孔层决定.此外,Ti6Al4V/20CoCrMo的耐腐蚀性能优于Ti6Al4V的耐腐蚀性能,提高双层样品的耐腐蚀性.研究粉末冶金法制备具有致密Ti6Al4V/20CoCrMo表层和多孔Ti6Al4V底层的双层结构材料,有助于生产定制化、具有良好磨损性能和体内寿命的植入物.“,”The aim of this work was to develop a Ti6Al4V/20CoCrMo?highly porous Ti6Al4V bilayer for biomedical applications. Conventional powder metallurgy technique, with semi-solid state sintering as consolidation step, was employed to fabricate samples with a compact top layer and a porous bottom layer to better mimic natural bone. The densification behavior of the bilayer specimen was studied by dilatometry and the resulting microstructure was observed by scan electron microscopy (SEM) and computed microtomography (CMT), while the mechanical properties and corrosion resistance were evaluated by compression and potentiodynamic tests, respectively. The results indicate that bilayer samples without cracks were obtained at the interface which has no negative impact on the densification. Permeability values of the highly porous layer were in the lower range of those of human bones. The compression behavior is dictated by the highly porous Ti6Al4V layer. Additionally, the corrosion resistance of Ti6Al4V/20CoCrMo is better than that of Ti6Al4V, which improves the performance of the bilayer sample. This work provides an insight into the important aspects of a bilayer fabrication by powder metallurgy and properties of Ti6Al4V/20CoCrMo?highly porous Ti6Al4V structure, which can potentially benefit the production of customized implants with improved wear performance and increased in vivo lifetime.