Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, Canada.
J Biomed Mater Res B Appl Biomater. 2012 Oct;100(7):1970-9. doi: 10.1002/jbm.b.32764. Epub 2012 Aug 2.
This article describes physical, chemical, and mechanical characterizations of porous titanium implants made by an additive manufacturing method to gain insight into the correlation of process parameters and final physical properties of implants used in orthopedics. For the manufacturing chain, the powder metallurgy technology was combined with the additive manufacturing to fabricate the porous structure from the pure tanium powder. A 3D printing machine was employed in this study to produce porous bar samples. A number of physical parameters such as titanium powder size, polyvinyl alcohol (PVA) amount, sintering temperature and time were investigated to control the mechanical properties and porosity of the structures. The produced samples were characterized through porosity and shrinkage measurements, mechanical compression test and scanning electron microscopy (SEM). The results showed a level of porosity in the samples in the range of 31-43%, which is within the range of the porosity of the cancelluous bone and approaches the range of the porosity of the cortical bone. The results of the mechanical test showed that the compressive strength is in the wide range of 56-509 MPa implying the effect of the process parameters on the mechanical strengths. This technique of manufacturing of Ti porous structures demonstrated a low level of shrinkage with the shrinkage percentage ranging from 1.5 to 5%.
本文描述了通过增材制造方法制造的多孔钛植入物的物理、化学和机械特性，以深入了解骨科中使用的植入物的工艺参数和最终物理性能之间的相关性。对于制造链，粉末冶金技术与增材制造相结合，用纯钛粉末制造多孔结构。本研究采用 3D 打印机生产多孔棒样品。研究了钛粉粒径、聚乙烯醇（PVA）用量、烧结温度和时间等多种物理参数，以控制结构的机械性能和孔隙率。通过孔隙率和收缩测量、机械压缩试验和扫描电子显微镜（SEM）对所生产的样品进行了表征。结果表明，样品的孔隙率在 31%-43%范围内，处于松质骨的孔隙率范围内，接近皮质骨的孔隙率范围。力学试验结果表明，压缩强度在 56-509MPa 的较宽范围内，这意味着工艺参数对力学强度的影响。Ti 多孔结构的这种制造技术表现出较低的收缩水平，收缩率在 1.5%至 5%之间。
