Department of Theoretical and Experimental Physics, Tomsk Polytechnic University, Tomsk, Russia.
J Mater Sci Mater Med. 2010 Apr;21(4):1233-9. doi: 10.1007/s10856-010-3989-5. Epub 2010 Jan 30.
Thin calcium phosphate coatings were deposited on NiTi substrates (plates) by rf-magnetron sputtering. The release of nickel upon immersion in water or in saline solution (0.9% NaCl in water) was measured by atomic absorption spectroscopy (AAS) for 42 days. The coating was analyzed before and after immersion by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). After an initial burst during the first 7 days that was observed for all samples, the rate of nickel release decreased 0.4-0.5 ng cm(-2) d(-1) for a 0.5 mum-thick calcium phosphate coating (deposited at 290 W). This was much less than the release from uncoated NiTi (3.4-4.4 ng cm(-2) d(-1)). Notably, the nickel release rate was not significantly different in pure water and in aqueous saline solution.
通过射频磁控溅射在 NiTi 基底（板）上沉积了薄的磷酸钙涂层。通过原子吸收光谱法（AAS）测量了镍在水中或盐溶液（水中 0.9%NaCl）中浸泡 42 天期间的释放量。在浸泡前后通过 X 射线粉末衍射（XRD）、扫描电子显微镜（SEM）和能谱（EDX）对涂层进行了分析。所有样品在最初的 7 天内都观察到了初始爆发，随后镍的释放速率降低，0.5 µm 厚的磷酸钙涂层（在 290 W 下沉积）的释放速率为 0.4-0.5 ng cm(-2) d(-1)。这比未涂层的 NiTi 的释放量（3.4-4.4 ng cm(-2) d(-1)）要少得多。值得注意的是，镍的释放速率在纯水中和盐水溶液中没有显著差异。
