通过增材制造制备的氧化锆增韧氧化铝涂层Ti6Al4V
Zirconia-Toughened Alumina Coated Ti6Al4V via Additive Manufacturing.
作者信息
Avila Jose D, Bandyopadhyay Amit
机构信息
W. M. Keck Biomedical Materials Research Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, U.S.A.
出版信息
Mater Lett. 2021 May 15;291. doi: 10.1016/j.matlet.2021.129577. Epub 2021 Feb 19.
CoCr alloy-based femoral heads have failed prematurely due to galvanic-induced corrosion when coupled with a titanium hip stem. Coupling a titanium based-femoral head with the titanium hip stem is ideal in addressing this failure mode. Ti6Al4V (Ti64) alloy was reinforced with zirconia-toughened alumina (ZTA) by directed-energy deposition (DED)-based additive manufacturing (AM) to address that concern. Preliminary materials processing work resulted in failed samples due to cracking, porosity, and delamination. After careful parameter optimization, a Ti64+5wt.%ZTA (5ZTA) composition produced a metallurgically sound and coherent interface, minimal porosity, and bulk structures. Hardness was observed to increase by 27%, normalized wear rate reduced by 25%, and contact resistance increased during tribological testing along with faster surface re-passivation.
钴铬合金基股骨头与钛制髋关节柄配合使用时，由于电偶腐蚀而过早失效。将钛基金属股骨头与钛制髋关节柄配合使用是解决这种失效模式的理想方法。通过基于定向能量沉积（DED）的增材制造（AM），用氧化锆增韧氧化铝（ZTA）增强Ti6Al4V（Ti64）合金，以解决这一问题。初步的材料加工工作由于出现裂纹、孔隙和分层而导致样品失效。经过仔细的参数优化，Ti64 + 5wt.%ZTA（5ZTA）成分产生了冶金性能良好且连贯的界面、最小的孔隙率和整体结构。在摩擦学测试期间，观察到硬度增加了27%，归一化磨损率降低了25%，接触电阻增加，同时表面再钝化更快。
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