Tailoring the Surface of NiTi Alloy Using PIRAC Nitriding Followed by Anodization and Phosphonate Monolayer Deposition
Tailoring the Surface of NiTi Alloy Using PIRAC Nitriding Followed by Anodization and Phosphonate Monolayer Deposition
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DOI：
10.1021/cm703710q
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发表时间：
2008-08
影响因子：
8.6
通讯作者：
G. Zorn;Racheli Adadi;R. Brener;V. Yakovlev;I. Gotman;E. Gutmanas;C. Sukenik
中科院分区：
文献类型：
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作者：
G. Zorn;Racheli Adadi;R. Brener;V. Yakovlev;I. Gotman;E. Gutmanas;C. Sukenik
采用粉末浸没反应辅助涂层法（PIRAC）对镍钛（NiTi, nitinol）形状记忆合金进行氮化处理，改善其表面性能。PIRAC渗氮是基于在由不稳定的氮化物粉末分解提供的高活性氮的气氛中退火样品，或者通过选择性地将大气中的氮扩散到样品表面。由于它没有视线限制，镍钛诺合金的PIRAC氮化可以对复杂形状（例如外科植入物）进行均匀处理。其结果是形成无ni的TiN膜，并大大改善了底层NiTi合金的腐蚀行为。通过在PIRAC氮化镍钛诺表面附着膦酸盐锚定自组装单层膜（SAM），可以显著增强PIRAC氮化镍钛诺的用途。利用FTIR、接触角测量和XPS分析对PIRAC氮化镍钛诺和溅射到硅片上的TiN薄膜上的磷酸盐锚定SAMs进行了表征。…
Nickel titanium (NiTi, nitinol) shape memory alloy was nitrided using a powder immersion reaction assisted coating (PIRAC) method to modify its surface properties. PIRAC nitriding is based on annealing the samples in an atmosphere of highly reactive nitrogen supplied by decomposition of unstable nitride powders or, alternatively, by selective diffusion of atmospheric nitrogen to the sample surface. Since it is not line of sight limited, PIRAC nitriding of nitinol alloys allows uniform treatment of complex shapes (e.g., surgical implants). It results in the formation of a Ni-free TiN film and considerably improves the corrosion behavior of the underlying NiTi alloy. The usefulness of PIRAC nitrided nitinol could be significantly enhanced by attaching to its surface a phosphonate anchored self-assembled monolayer (SAM). Phosphonate-anchored SAMs on PIRAC nitrided nitinol and on thin films of TiN sputtered onto a silicon wafer have been characterized by FTIR, contact angle measurements, and XPS analysis. The...