Paital Sameer R, Balani Kantesh, Agarwal Arvind, Dahotre Narendra B
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA.
Biomed Mater. 2009 Feb;4(1):015009. doi: 10.1088/1748-6041/4/1/015009. Epub 2008 Nov 20.
In the present paper, we demonstrate the feasibility of depositing a tailored calcium phosphate (Ca-P) coating on a Ti-6Al-4V substrate by using a pulsed Nd:YAG laser system. Different textures were obtained by varying the laser spot overlap with change in laser traverse speed. Surface roughness measurements using laser confocal microscopy indicated a decrease in roughness with increasing laser scan speed. X-ray diffraction studies revealed the formation of alpha-TCP, TiO2, Ti and Al as the major phases. An instrumented nanoindenation technique used to study the mechanical properties of the coatings, revealed a very high hardness and Young's modulus of the coating surface as compared to the substrate. This further proved the retainment of the ceramic phase on the surface. Wear studies in a simulated biofluid (SBF) environment demonstrated an increased wear resistance of the coated samples as compared to the bare Ti-6Al-4V. Formation of an apatite-like layer after immersion in SBF for different time periods further demonstrated the bioactivity of the coated samples.
在本论文中，我们展示了通过使用脉冲Nd:YAG激光系统在Ti-6Al-4V基底上沉积定制磷酸钙（Ca-P）涂层的可行性。通过改变激光光斑重叠度并改变激光横向扫描速度获得了不同的织构。使用激光共聚焦显微镜进行的表面粗糙度测量表明，随着激光扫描速度的增加粗糙度降低。X射线衍射研究揭示了α-TCP、TiO₂、Ti和Al作为主要相的形成。用于研究涂层力学性能的仪器化纳米压痕技术表明，与基底相比，涂层表面具有非常高的硬度和杨氏模量。这进一步证明了陶瓷相在表面的保留。在模拟生物流体（SBF）环境中的磨损研究表明，与裸露的Ti-6Al-4V相比，涂层样品的耐磨性有所提高。在不同时间段浸入SBF后形成类磷灰石层进一步证明了涂层样品的生物活性。
