Improvement Of Corrosion Resistance And
Bio Compatibility Of Ni-Ti Shape Memory
Alloy By Various Surface Modifications
Author(s)
Y. Kimura
Abstract
Nickel-titanium shape memory alloy (Ni-Ti alloy) has unique mechanical
properties such as shape memory effect and super elasticity along with good
wear and corrosion resistances. For this reason Ni-Ti alloy is expected to be used
as implant material in the biomedical field. However, the biocompatibility of the
Ni-Ti alloy is not fully examined. The purpose of this research is to evaluate in
vitro cytocompatibility and to try to improve corrosion resistance for Ni-Ti alloy
by various surface modifications. Ni-Ti alloy showed good cytocompatibility
compared with that of a Ti-6Al-4V alloy, judging from the small amount of
hIL-1β and LDH generations. Biocompatibility of the Ni-Ti alloy is superior
compared with pure nickel. Also, it was made clear that the biocompatibility of
the Ni-Ti alloy showed almost the same level as that of stainless steel, which
gave a lot of actual results as a biomaterial until now. Therefore, it was
understood that there is no problem in the biocompatibility of the Ni-Ti alloy for
application as a biomaterial. Moreover, corrosion resistance of in air oxidized
Ni-Ti alloy was recognized to be greatly improved.
Keywords: nickel-titanium shape memory alloy, cytocompatibility,
bio-compatibility, biomaterial.
1 Introduction
Ni-Ti alloy shows unique mechanical properties namely shape memory effect
and super elasticity [1,2] along with good wear resistance and good corrosion
resistance [3]. It provides a possibility for making self-locking, self-expanding
and self-compressing implant. For this reason Ni-Ti alloy is expected to use as
Keywords
nickel-titanium shape memory alloy, cytocompatibility,
bio-compatibility, biomaterial.
Related Book
Other papers in this volume
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