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首页> 外文期刊>Acta biomaterialia >Laser-assisted Zr/ZrO(2) coating on Ti for load-bearing implants.
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Laser-assisted Zr/ZrO(2) coating on Ti for load-bearing implants.

机译：Ti上的激光辅助Zr / ZrO（2）涂层，用于承重植入物。

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摘要

Oxidized Zr alloys have been shown to exhibit lower friction and superior wear properties, suggesting that they could be used in hip and knee implants. However, conventional oxidation of Zr alloys above 500 degrees C, in dry air, for several hours has been shown to have detrimental effects on the substrate's properties. In this work, we deposited pure Zr on Ti, then oxidized the coating using a continuous-wave Nd:YAG laser, which facilitated localized heating to elevated temperatures without affecting the substrate. Laser-assisted oxidation resulted in a 7microm thick fully dense ZrO(2) layer on Zr in which an increase in oxidation kinetics was evident due to an increase in the laser power and/or the oxygen partial pressure. Due to its high surface energy and wettability, the wear rate of laser-oxidized Zr was two orders of magnitude less compared to that of as-deposited Zr. The oxidized coatings showed comparable in vitro biocompatibility to that of pure Ti and excellent in vitro cell-material interactions. This article reports the processing of Zr/ZrO(2) coatings on Ti using lasers, and the influence of laser parameters and oxygen partial pressure on the coating's mechanical, microstructural, wear and in vitro biological properties using human osteoblast cells.
机译：氧化Zr合金已显示出较低的摩擦力和优异的耐磨性能，表明它们可用于髋关节和膝关节植入物。然而，已经证明在干燥的空气中在高于500摄氏度的温度下对Zr合金进行常规氧化数小时对基材的性能有不利影响。在这项工作中，我们将纯Zr沉积在Ti上，然后使用连续波Nd：YAG激光氧化涂层，这有助于将局部加热到高温而不会影响基材。激光辅助氧化在Zr上形成7微米厚的完全致密ZrO（2）层，其中氧化动力学的提高是由于激光功率和/或氧分压的增加而明显的。由于其高的表面能和可湿性，与被沉积的Zr相比，激光氧化的Zr的磨损率小两个数量级。氧化后的涂层显示出与纯钛相当的体外生物相容性，并具有优异的体外细胞与材料的相互作用。本文报道了使用激光在Ti上处理Zr / ZrO（2）涂层的过程，以及使用人类成骨细胞对激光参数和氧分压对涂层的机械，微观结构，磨损和体外生物学特性的影响。

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