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Surface oxidation of NiTi shape memory alloy

Paper ID Volume ID Publish Year Pages File Format Full-Text
13599 882 2002 9 PDF Available
Title
Surface oxidation of NiTi shape memory alloy
Abstract

Mechanically polished NiTi alloy (50 at% Ni) was subjected to heat treatment in air in the temperature range 300–800°C and characterised by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. Thermogravimetry measurements were carried out to investigate the kinetics of oxidation. The results of thermodynamic calculations were compared to the experimental observations. It was found that NiTi alloy exhibits different oxidation behaviour at temperatures below and above 500°C. A Ni-free zone was found in the oxide layer for oxidation temperatures of 500°C and 600°C. The oxidation at 500°C produces a smooth protective nickel-free oxide layer with a relatively small amount of Ni species at the air/oxide interface, which is in favour of good biocompatibility of NiTi implants. The oxidation mechanism for the NiTi shape memory alloy is discussed.

Keywords
Oxidation; Intermetallic; Shape memory alloys; Biomaterials
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Surface oxidation of NiTi shape memory alloy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 24, December 2002, Pages 4863–4871
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us