School of Mechanical Engineering, Purdue University, Center for Laser-Based Manufacturing, West Lafayette, IN 47907.
J Biomed Mater Res B Appl Biomater. 2013 Oct;101(7):1124-32. doi: 10.1002/jbm.b.32921. Epub 2013 Apr 6.
Functionally gradient bio-coating material was built by laser deposition. Co-Cr-Mo material was deposited on a Ti-6Al-4V substrate transitioning from 0% to 100%. Control over the cooling rate is shown to be a key to reduce the effects of thermal expansion differences of the materials. The microstructures and composition of the functionally gradient material (FGM) were characterized using an optical microscope, SEM, EDS, and XRD. EDS results showed a gradual transition to 50% Co-Cr-Mo and ∼100% Co-Cr-Mo on the top layer. XRD analysis showed the absence of a brittle intermetallic phase that forms between Titanium and Cobalt. As the amount of Co-Cr-Mo increased, the microhardness of the FGM samples significantly increased. A comparison was made between Co-Cr-Mo deposited on SS316L substrates as well as Ti-6Al-4V. The bonding strength of the coatings on both substrates was tested and found to meet the ASTM standard requirement.
通过激光沉积技术构建了具有功能梯度的生物涂层材料。将 Co-Cr-Mo 材料沉积在 Ti-6Al-4V 基底上，从 0%到 100%逐渐过渡。研究表明，控制冷却速率是减少材料热膨胀差异影响的关键。采用光学显微镜、SEM、EDS 和 XRD 对功能梯度材料（FGM）的微观结构和成分进行了表征。EDS 结果表明，在顶层逐渐过渡到 50%Co-Cr-Mo 和约 100%Co-Cr-Mo。XRD 分析表明，钛和钴之间形成的脆性金属间化合物相不存在。随着 Co-Cr-Mo 的增加，FGM 样品的显微硬度显著增加。还比较了沉积在 SS316L 基底和 Ti-6Al-4V 上的 Co-Cr-Mo。对两种基底上涂层的结合强度进行了测试，发现符合 ASTM 标准要求。
