Kiuru Mirjami, Alakoski Esa, Tiainen Veli-Matti, Lappalainen Reijo, Anttila Asko
Department of Physical Sciences, University of Helsinki, P. O. Box 64, FIN-00014, University of Helsinki, Finland.
J Biomed Mater Res B Appl Biomater. 2003 Jul 15;66(1):425-8. doi: 10.1002/jbm.b.10029.
The acid resistance of tantalum coated and uncoated human hip joint prostheses was studied with commercial CrCoMo acetabular cups. The samples were exposed to 10% HCl solution and the quantities of dissolved Cr, Co, and Mo were measured with proton-induced X-ray emission (PIXE). The absolute quantities were obtained with the use of Cr and Se solution standards. Tantalum coatings (thicknesses 4-6 microm) were prepared in vacuum with magnetron sputtering. Tantalum coating decreased the corrosion rate by a factor of 10(6). As a spinoff from recent wear tests on artificial hip joints it was shown that tantalum has excellent mechanical properties as an intermediate layer of diamond-like carbon (DLC) coatings. When tantalum was tested together with DLC on three metal-on-metal hip joint pairs in a hip simulator, no observable defects occurred during 15 million walking cycles with a periodic 50-300-kg load (Paul curve).
采用商用铬钴钼髋臼杯对涂钽和未涂钽的人体髋关节假体的耐酸性进行了研究。将样品暴露于10%的盐酸溶液中，并用质子激发X射线发射（PIXE）测量溶解的铬、钴和钼的量。通过使用铬和硒溶液标准品获得绝对量。钽涂层（厚度4 - 6微米）通过磁控溅射在真空中制备。钽涂层使腐蚀速率降低了10⁶倍。作为近期人工髋关节磨损试验的附带成果表明，钽作为类金刚石碳（DLC）涂层的中间层具有优异的机械性能。当在髋关节模拟器中对三个金属对金属的髋关节对将钽与DLC一起进行测试时，在1500万次周期性50 - 300千克负载（保罗曲线）的行走循环中未观察到明显缺陷。
