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首页> 外文期刊>Applied Surface Science >Bioactive (Si, O, N)/(Ti, O, N)/Ti composite coating on NiTi shape memory alloy for enhanced wear and corrosion performance
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Bioactive (Si, O, N)/(Ti, O, N)/Ti composite coating on NiTi shape memory alloy for enhanced wear and corrosion performance

机译：NiTi形状记忆合金上的生物活性（Si，O，N）/（Ti，O，N）/ Ti复合涂层可增强磨损和腐蚀性能

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In this investigation, (Si, O, N)/(Ti, O, N)/Ti composite coating was synthesized on a NiTi shape memory alloy (SMA) substrate (50.8 at.% Ni) via plasma immersion ion implantation and deposition (PIIID) followed by magnetron sputtering, with the aim of promoting bioactivity and biocompatibility of NiTi SMAs. Nano featured (Si, O, N)/(Ti, O, N)/Ti coating was approximate 0.84 +/- 0.05 mu m in thickness, and energy dispersive X-ray (EDX) spectroscopy showed that Ni element was depleted from the surface of coated samples. X-ray diffraction (XRD) did not identify the phase composition of the (Si, O, N)/(Ti, O, N)/Ti coating, probably due to its thin thickness and poor crystalline resulting from low-temperature coating processes (<200 degrees C). X-ray photoelectron spectroscopy (XPS) analyses confirmed that a Ni-free surface was formed and Si element was incorporated into the composite coating via the magnetron sputtering process. Additionally, phase transformation behaviors of uncoated and coated NiTi SMA samples were characterized using differential scanning calorimetry (DSC). Wear and corrosion resistance of uncoated and coated NiTi SMA samples were evaluated using ball-on-disc tests and potentio-dynamic polarization curves, respectively. The (Si, O, N)/(Ti, O, N)/Ti coated NiTi SMA samples showed enhanced wear and corrosion resistance. Furthermore, the (Si, O, N)/(Ti, O, N)/Ti composite coating facilitated apatite formation in simulated body fluid (SBF) and rendered NiTi SMA bioactivity. (C) 2015 Elsevier B.V. All rights reserved.
机译：在这项研究中，（Si，O，N）/（Ti，O，N）/ Ti复合涂层是通过等离子浸没离子注入和沉积在NiTi形状记忆合金（SMA）衬底（50.8 at。％Ni）上合成的（ PIIID），然后进行磁控溅射，以促进NiTi SMA的生物活性和生物相容性。纳米特征（Si，O，N）/（Ti，O，N）/ Ti涂层的厚度约为0.84 +/- 0.05μm，并且能量色散X射线（EDX）光谱表明Ni元素从涂层样品的表面。 X射线衍射（XRD）未能确定（Si，O，N）/（Ti，O，N）/ Ti涂层的相组成，可能是由于其薄的厚度和低温涂层工艺导致的不良结晶（<200摄氏度）。 X射线光电子能谱（XPS）分析证实，形成无镍表面，并且通过磁控溅射工艺将Si元素掺入复合涂层中。此外，使用差示扫描量热法（DSC）表征未涂覆和涂覆的NiTi SMA样品的相变行为。分别使用圆盘试验和电位动态极化曲线评估了未涂覆和涂覆的NiTi SMA样品的耐磨性和耐腐蚀性。 （Si，O，N）/（Ti，O，N）/ Ti涂层的NiTi SMA样品显示出增强的耐磨性和耐腐蚀性。此外，（Si，O，N）/（Ti，O，N）/ Ti复合涂层有助于在模拟体液（SBF）中形成磷灰石并提高NiTi SMA的生物活性。 （C）2015 Elsevier B.V.保留所有权利。

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