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Title: Laser gas nitriding modified on NiTi shape memory alloy
Authors: Zhang, S
Zhang, CH
Wang, Q
Man, HC 
Liu, CS
Keywords: Bone-like apatite
Laser surface modification
NiTi shape memory alloy
Simulated body fluid
Issue Date: 2006
Publisher: 中國醫學科學院
Source: 中國生物醫學工程學報 (Chinese journal of biomedical engineering), 2006, v. 25, no. 6, p. 739-744 How to cite?
Journal: 中國生物醫學工程學報 (Chinese journal of biomedical engineering) 
Abstract: In order to improve the bioactivity of NiTi shape memory alloy (SMA). Laser gas nitrided layer was fabricated on the surface of NiTi SMA after irradiated by a continuous wave Nd-YAG laser in N2 environment. It was studied that bone-like apatite formed on the surface of the acid and NaOH pretreated NiTi substrate and laser gas nitrided samples after immersion in simulated body fluid (SBF) at 37°C. Morphology and composition of the immersed samples' surface were characterized by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and fourier transfer infrared ray (FTIR). It is believed that the composition of the deposition is similar to that of the bone-apatite. The results indicate that laser gas nitriding can effectively improve the ability of NiTi SMA to induce the formation of bone-like apatite in vitro environment. The formed layer has the Ca, P mol ratio of 1.57 very close to that of bone-apatite in SBF at 37°C.
ISSN: 0258-8021
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