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Title: Effect of laser gas nitriding for biological activities on NiTi alloy
Authors: Zhang, S
Zhang, CH
Wang, Q
Man, HC 
Liu, CS
Keywords: Biological activity
Laser nitride modification
Nickel titanium shape memory alloy
Optical design and fabrication
Issue Date: 2007
Publisher: 上海科學技術出版社
Source: 中国激光 (Chinese journal of lasers), 2007, v. 34, no. SUPPL., p. 8-11 How to cite?
Journal: 中国激光 (Chinese journal of lasers) 
Abstract: NiTi shape memory alloy (NiTi SMA) has been widely used for many medical applications such as dental and orthopaedic implants. Laser gas nitriding is one of the most effective methods to improve the surface performance of NiTi 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. With optimum process parameters, a compact laser modified surface metal matrix composite (MMC) coating reinforced with fine TiN was achieved. There was a layer of TiN ceramics on the top of modification layer, with a thickness of 1-2 μm. Then the amount of TiN reinforcement gradually decreases across the coating. Morphology,composition and biological activities were individually investigated by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and immersion test in simulated body fluid (SBF) at 37°C. The results indicated that there was a good metallurgical bonding between the hard modification layer and the NiTi alloy substrate. Laser gas nitriding can effectively improve the ability of NiTi SMA to induce the formation of bone-like apatite in vitro environment.
ISSN: 0258-7025
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