Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31784
Title: Characterization of the laser gas nitrided surface of NiTi shape memory alloy
Authors: Cui, ZD
Man, HC 
Yang, XJ
Keywords: Ion release
Laser gas nitriding
NiTi
Surface characterization
Titanium nitride
Issue Date: 2003
Publisher: North-Holland
Source: Applied surface science, 2003, v. 208-209, no. 1, p. 388-393 How to cite?
Journal: Applied surface science 
Abstract: Owing to its unique properties such as shape memory effects, superelasticity and radiopacity, NiTi alloy is a valuable biomaterial for fabricating implants. The major concern of this alloy for biological applications is the high atomic percentage of nickel in the alloy and the deleterious effects to the body by the corrosion and/or wears products. In this study, a continuous wave Nd-YAG laser was used to conduct laser gas nitriding on the substrate of NiTi alloy. The results show that a continuous and crack-free thin TiN layer was produced in situ on the NiTi substrate. The characteristics of the nitrided surface layer were investigated using SEM, XRD, XPS and AAS. No nickel signal was detected on the top surface of the laser gas nitrided layer. As compared with the mechanical polished NiTi alloy, the nickel ion release rate out of the nitrided NiTi alloy decreased significantly in Hanks' solution at 37 °C, especially the initial release rate.
URI: http://hdl.handle.net/10397/31784
ISSN: 0169-4332
EISSN: 1873-5584
DOI: 10.1016/S0169-4332(02)01414-9
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