کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5362355 | 1388284 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of a controlled oxidation at moderate temperatures on the surface chemistry of nitinol wire
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Commercial nitinol wire is oxidised at 480-530 °C/10 min in air. Surface morphology and chemistry is studied in detail using scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, Raman spectrometry and X-ray photoelectron spectroscopy. It is found that the main oxidation product at both temperatures is rutile containing a few at.% Ni. Beneath the rutile layer, there are titanium sub-oxides, showing characteristic maxima in depth profiles. Nickel in an oxidised state is present on the surface, whereas in a sub-surface region of scales, there is only metallic nickel. Thickness of the total oxide layers is 70 and 140 nm after oxidation at 480 and 530 °C, respectively. The preferential oxidation of titanium causes the formation of a Ni-enriched and Ti-depleted zone, suggesting the presence of Ni3Ti phase. XRD reveals that the presence of cubic B2 NiTi phase in the base alloy is not affected by oxidation at 480-530 °C/10 min.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 254, Issue 18, 15 July 2008, Pages 5664-5669
Journal: Applied Surface Science - Volume 254, Issue 18, 15 July 2008, Pages 5664-5669
نویسندگان
D. Vojtech, L. Joska, J. Leitner,