Surface spectroscopic characterization of TiNi nearly equiatomic shape memory alloys for implants
Journal Article
·
· Journal of Vacuum Science and Technology, A
- Ames Laboratory, Department of Energy, Ames, Iowa 50011 (United States)
In spite of the generally good biocompatibility of TiNi revealed in numerous {ital in} {ital vivo} studies, medical applications of these shape memory alloys as implants are hindered due to the lack of knowledge on the nature of their biocompatibility. Better material characterization is necessary for understanding the chemical and physical properties which determine biocompatibility. The purpose of the present investigation is to use angle-resolved x-ray photoelectron spectroscopy to identify the differences in surface chemical state and composition between the layers formed on the surface of TiNi alloys after mechanical polishing, chemical etching, autoclaving in water and steam, and exposure to H{sub 2}O{sub 2} or air. The surface chemistry drastically depends on the preparation method; the Ni surface concentration can be varied in the range 0--30 at. %. In natural conditions (air, water, and steam) TiNi surfaces revealed a tendency to be covered by Ti{sub {ital x}}Ni{sub {ital y}}O{sub 2{ital x}} oxides (where {ital x} varies in the range of 7--20 and {ital y} varies in the range of 0--5 depending on preparation procedure) with a small amount of Ni in metallic state ({similar_to}0.5 at. %). This finding is considered to be the reason for the good biocompatibility of TiNi. {copyright} {ital 1995} {ital American} {ital Vacuum} {ital Society}
- OSTI ID:
- 253252
- Journal Information:
- Journal of Vacuum Science and Technology, A, Journal Name: Journal of Vacuum Science and Technology, A Journal Issue: 5 Vol. 13; ISSN 0734-2101; ISSN JVTAD6
- Country of Publication:
- United States
- Language:
- English
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