Bartolomeu F, Sampaio M, Carvalho O, Pinto E, Alves N, Gomes J R, Silva F S, Miranda G
Centre for Micro-Electro Mechanical Systems (CMEMS-UMinho), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
Centre for Micro-Electro Mechanical Systems (CMEMS-UMinho), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
J Mech Behav Biomed Mater. 2017 May;69:128-134. doi: 10.1016/j.jmbbm.2017.01.004. Epub 2017 Jan 4.
Additive manufacturing (AM) technologies enable the fabrication of innovative structures with complex geometries not easily manufactured by traditional processes. Regarding metallic cellular structures with tailored/customized mechanical and wear performance aiming to biomedical applications, Selective Laser Melting (SLM) is a remarkable solution for their production. Focusing on prosthesis and implants, in addition to a suitable Young's modulus it is important to assess the friction response and wear resistance of these cellular structures in a natural environment. In this sense, five cellular Ti6Al4V structures with different open-cell sizes (100-500µm) were designed and produced by SLM. These structures were tribologicaly tested against alumina using a reciprocating sliding ball-on-plate tribometer. Samples were submerged in Phosphate Buffered Saline (PBS) fluid at 37°C, in order to mimic in some extent the human body environment. The results showed that friction and wear performance of Ti6Al4V cellular structures is influenced by the structure open-cell size. The higher wear resistance was obtained for structures with 100µm designed open-cell size due to the higher apparent area of contact to support tribological loading.
增材制造（AM）技术能够制造出具有复杂几何形状的创新结构，而这些结构采用传统工艺很难制造。对于旨在用于生物医学应用、具有定制化机械和耐磨性能的金属多孔结构而言，选择性激光熔化（SLM）是生产它们的一种卓越解决方案。着眼于假体和植入物，除了要有合适的杨氏模量外，评估这些多孔结构在自然环境中的摩擦响应和耐磨性也很重要。从这个意义上讲，设计并通过SLM制造了五种具有不同开孔尺寸（100 - 500µm）的多孔Ti6Al4V结构。使用往复式滑动球盘摩擦磨损试验机对这些结构与氧化铝进行了摩擦学测试。样品被浸没在37°C的磷酸盐缓冲盐水（PBS）溶液中，以便在一定程度上模拟人体环境。结果表明，Ti6Al4V多孔结构的摩擦和磨损性能受结构开孔尺寸的影响。由于具有更高的表观接触面积来承受摩擦学载荷，开孔尺寸设计为100µm的结构具有更高的耐磨性。
