Ti-5Ta-30Nb-7Zr合金医用多孔材料的电子束选区熔化成形及表征

摘要

Ti-5Ta-30Nb-7Zr biomedical porous alloy with different pore structures was fabricated by selective electron beam melting(SEBM).Microstructure,mechanical property and the proliferation of osteoblast were investigated.The results show that the structure and size of the pore can be well controlled by SEBM,so that the mechanical properties of porous materials can have a better match with those of human bones.The SEBM Ti-STa-30Nb-7Zr alloy mainly consist ofβ phase and some uniformly distributed α phase particles,and the comprehensive curve of the porous Ti-STa30Nb-7Zr alloy exists a long stress plate which can act as a buffer for external impacts and is very suitable for the bearing position in body.The highly porous titanium implants with a rough surface manufactured using SEBM method are suitable for cell growth,and the cells grow well.%采用电子束选区熔化成形技术制备了具有不同孔结构的Ti-5Ta-30Nb-7Zr合金医用多孔材料.对该多孔材料的显微组织、力学性能进行了表征,观察了样品表面对细胞生长形态的影响.实验结果表明:电子束选区熔化成形技术能够灵活地控制孔的结构和尺寸,使多孔材料力学性能与人骨力学性能更好地匹配;成形的Ti-5Ta-30Nb-7Zr合金多孔材料主要由β相和均匀分布的颗粒状α相组成,其压缩应力-应变曲线存在一个较长的应力平台,对外来冲击可起缓冲作用,更适于用做人体承载部件;粗糙的孔壁结构为细胞生长提供了良好的生长条件,细胞生长状态良好.