Effects of post-processing on microstructure and adhesion strength of TiO2 nanotubes on 3D-printed Ti-6Al-4V alloy
Effects of post-processing on microstructure and adhesion strength of TiO2 nanotubes on 3D-printed Ti-6Al-4V alloy
复制标题
DOI：
10.1016/j.surfcoat.2021.127431
复制
发表时间：
2021-07-01
影响因子：
5.4
通讯作者：
Khamwannah, Jirapon
中科院分区：
文献类型：
--
作者：
Decha-umphai, Dechawut;Chunate, H-thaichnok;Khamwannah, Jirapon
典型的3D打印工艺包括快速冷却步骤，这将显著影响打印的Ti-6Al-4V合金的机械行为。在本研究中，采用3D打印技术，按照骨植入的常规方法，制备出了钛铝钒合金零件；随后，对零件进行了热处理，以改善表面二氧化钛纳米管阵列的机械性能和附着力。对印刷合金进行一步阳极氧化，得到表面二氧化钛纳米管阵列。这是首次研究3D打印的Ti-6Al-4V合金在阳极氧化前后的热处理效果。用光学显微镜(OM)和场发射扫描电子显微镜(FESEM)对纳米管的形貌进行了表征；用X射线衍射仪(X射线衍射仪)对纳米管的物相进行了表征；通过划痕实验验证了纳米管阵列的粘附性；通过水接触角的测量确定了纳米管的亲水性。结果表明，阳极氧化前在950℃热处理的样品形成了α和β结构相，导致了纳米管阵列的峰谷形态。阳极氧化后的样品在500℃下进行热处理，增大了纳米管的内径，提高了纳米管阵列与3D打印的Ti-6Al-4V衬底之间的结合强度。此外，退火后的样品具有较低的水接触角，亲水性增强。这些结果表明，在定制植入物的生产过程中，添加二氧化钛纳米管阵列的3D打印Ti-6Al-4V零件可能是合适的。
Typical 3D-printing processes involve rapid cooling steps that significantly affect the mechanical behavior of printed Ti-6Al-4V alloys. In this study, the 3D-printing technique was used to fabricate Ti-6Al-4V parts, as is customary of bone implants; subsequently, the parts were heat-treated to improve the mechanical properties and the adhesion of surface TiO2 nanotubes arrays. One-step anodization was applied to the printed alloys to obtain surface TiO2 nanotubes arrays. This is the first study investigating the effects of heat treatment of 3D-printed Ti-6Al-4V alloys, both pre and post - anodization. The morphology of the TiO2 nanotube layers was characterized by optical microscopy (OM) and field emission scanning electron microscopy (FESEM); phases were confirmed by Xray diffraction (XRD); adhesion of TiO2 nanotubes arrays was proved by scratch tests; hydrophilic properties were confirmed by water contact angle measurements. The results showed that samples heat-treated at 950 degrees C before anodization formed alpha and beta structural phases, resulting in a peak-and-valley morphology in the TiO2 nanotube arrays. Sample annealing at 500 degrees C after anodization increased the inner diameter of the TiO2 nanotubes and improved the adhesion strength between the TiO2 nanotube arrays and the 3D-printed Ti-6Al-4V substrate. Moreover, annealed samples displayed lower water contact angles, signifying that the hydrophilicity is increase. These results suggest that a 3D-printed Ti-6Al-4V part with an added TiO2 nanotubes array may be suitable during the production of the customized implants.