Paper

Tribological Properties of Biomedical NiTi Shape Memory Alloy after Rf Plasma Nitriding


Authors:
Fayez Mahamoud El-Hossary; Sayed Mohammed Khalil; Magdy Abdel Wahab Kassem; Medhat Abed EL Lateef; Khaled Lotfy
Abstract
Nickel titanium (NiTi) alloys are potentially useful in biomedical applications due to their unique superelasticity behaviour and shape memory effects (SME). However, these alloys are vulnerable to surface corrosion and the most serious issue is out-diffusion of toxic Ni ions from the substrate into body tissues and fluids. Hence, it is necessary to produce a surface barrier to impede the out-diffusion of Ni ions from the alloys. The inductively coupled radio frequency plasma (ICRFP) is an efficient technique for modifying the surfaces of NiTi alloys. The results exhibit the enhancement of the corrosion resistance and tribological properties of the NiTi substrate, but also effectively suppress the Ni ions release from the substrate. All these improvements can be attributed to the formation of titanium nitride (TiN) on the surface of NiTi alloys.
Keywords
Nickel Titanium (NiTi); Superelasticity; Shape Memory Effect SME; Inductively Coupled Radio Frequency Plasma (ICRFP); Corrosion Resistance; Fraction Coefficient
StartPage
54
EndPage
67
Doi
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