烧结工艺对添加造孔剂制备多孔钛性能的影响

摘要

采用粉末冶金法在不同烧结条件下添加聚甲基丙烯酸甲酯造孔剂制备临床骨科用多孔钛,并研究其形态特征及力学性能.研究表明:烧结温度的升高及时间的延迟导致多孔钛孔壁晶粒尺寸的增大和孔隙尺寸的减小,从而提高多孔钛的拉伸强度和弹性模量.与多孔钛相比,未添加造孔剂烧结钛制品的显微组织及力学性能更加依赖烧结温度及时间.这些机制的相对贡献亦受原始粉末结构及氧含量的影响.%Porous Ti for the application in clinic orthopaedics field was manufactured by powder metallurgy technique using polymethyl methacrylate as the space holder under different sintering conditions. The final morphological features and mechanical properties were described. The results show that the increase of sintering temperature and time leads to improved grain size of porous Ti ligament and decreased pore size, with a concomitant increase of tensile strength and elastic modulus. The microstructure and mechanical properties of solid Ti depend more on the sintering temperature and time than those of porous Ti. The relative contributions of these mechanisms of porous Ti vary with the initial microstructure and oxygen content.