Corrosion resistance, surface mechanical properties, and cytocompatibility of plasma immersion ion implantation-treated nickel-titanium shape memory alloys

2005 ◽  
Vol 75A (2) ◽  
pp. 256-267 ◽  
Author(s):  
K. W. K. Yeung ◽  
R. W. Y. Poon ◽  
X. Y. Liu ◽  
J. P. Y. Ho ◽  
C. Y. Chung ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Ion Implantation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Nickel Titanium ◽  
Resistance Surface ◽  
Plasma Immersion Ion Implantation

Carbon plasma immersion ion implantation of nickel–titanium shape memory alloys

Biomaterials ◽  
2005 ◽  
Vol 26 (15) ◽  
pp. 2265-2272 ◽  
Author(s):  
R.W.Y. Poon ◽  
K.W.K. Yeung ◽  
X.Y. Liu ◽  
P.K. Chu ◽  
C.Y. Chung ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Nickel Titanium ◽  
Plasma Immersion Ion Implantation ◽  
Carbon Plasma

Anti-Corrosion Properties of Nitrogen and Oxygen Plasma-Implanted Nickel-Titanium Shape Memory Alloy

2005 ◽  
Vol 107 ◽  
pp. 111-114 ◽  
Author(s):  
J.P.Y. Ho ◽  
R.W.Y. Poon ◽  
Y.T. Xie ◽  
P.C.T. Ha ◽  
Paul K. Chu
Keyword(s):  
Corrosion Resistance ◽  
Shape Memory ◽  
Oxygen Plasma ◽  
Orthopedic Implants ◽  
Nickel Titanium ◽  
Corrosion Properties ◽  
Barrier Layers ◽  
Optimal Processing ◽  
Potential Applications ◽  
Plasma Immersion Ion Implantation

Nickel-titanium shape memory alloys (NiTi) have potential applications as orthopedic implants but out-diffusion of harmful Ni from the NiTi substrate during prolonged use inside a human body is a serious issue and the problem must be solved before the materials can be more widely used in orthopedics. In this work, we produce TiN and TiOx barrier layers by plasma immersion ion implantation (PIII) and study the effects of different working voltages (20kV, 30kV, and 40kV). The corrosion resistance of the plasma-treated materials is found to be much improved and the optimal processing windows are described in this paper.

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