Charles University, Department of Physics of Materials, Prague, Czech Republic.
J Mech Behav Biomed Mater. 2012 Mar;7:96-105. doi: 10.1016/j.jmbbm.2011.07.001. Epub 2011 Jul 18.
This study investigated the properties of Ti-6Al-4V alloy after surface treatment by the electric discharge machining (EDM) process. The EDM process with high peak currents proved to induce surface macro-roughness and to cause chemical changes to the surface. Evaluations were made of the mechanical properties by means of tensile tests, and of surface roughness for different peak currents of the EDM process. The EDM process with peak current of 29 A was found to induce sufficient surface roughness, and to have a low adverse effect on tensile properties. The chemical changes were studied by scanning electron microscopy equipped with an energy dispersive X-ray analyser (EDX). The surface of the benchmark samples was obtained by plasma-spraying a titanium dioxide coating. An investigation of the biocompatibility of the surface-treated Ti-6Al-4V samples in cultures of human osteoblast-like MG 63 cells revealed that the samples modified by EDM provided better substrates for the adhesion, growth and viability of MG 63 cells than the TiO2 coated surface. Thus, EDM treatment can be considered as a promising surface modification to orthopaedic implants, in which good integration with the surrounding bone tissue is required.
本研究调查了 Ti-6Al-4V 合金经过电火花加工（EDM）表面处理后的性能。高峰值电流的 EDM 工艺被证明会引起表面宏观粗糙度，并导致表面发生化学变化。通过拉伸试验评估了机械性能，通过 EDM 工艺不同峰值电流评估了表面粗糙度。发现峰值电流为 29A 的 EDM 工艺能诱导出足够的表面粗糙度，并且对拉伸性能的不良影响较低。通过配备能量色散 X 射线分析仪（EDX）的扫描电子显微镜研究了化学变化。通过等离子喷涂二氧化钛涂层获得了基准样品的表面。对经 EDM 处理的 Ti-6Al-4V 样品在人成骨样 MG63 细胞培养中的生物相容性进行了研究，结果表明，经 EDM 处理的样品比 TiO2 涂层表面更能为 MG63 细胞的黏附、生长和存活提供更好的基质。因此，EDM 处理可被认为是一种有前途的骨科植入物表面改性方法，在这种方法中，需要与周围骨组织良好整合。
