XPS characterisation of surface modified Ni-Ti shape memory alloy

Green, S. M. and Grant, D. M. and Wood, J. V. (1997) XPS characterisation of surface modified Ni-Ti shape memory alloy. Materials Science and Engineering: A, 224 (1–2). pp. 21-26. ISSN 0921-5093

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Ni-Ti shape memory alloy has been surface amorphised by N+ ion implantation and by controlled shot peening in order to improve surface mechanical properties. X-ray photoelectron spectroscopy (XPS) and surface wetting measurements have been used to characterise the surface modified Ni-Ti to provide a fuller understanding of the biomaterial potential of such a material. The results of this study show that both the modified and unmodified Ni-Ti surfaces were predominantly covered with TiO2 and the underlying substrate crystallography determined both the affinity for surface OH−/chemisorbed water and ultimately the wetting behaviour of distilled water. Additionally, N+ ion implanted Ni-Ti contained a TiN phase within the surface which reduced wetting, demonstrating a reduced interfacial energy. The surface concentrations of Ni were unaffected by the surface modifications, with all samples containing less than 3 at.% Ni. This study has shown that the surface TiO2 oxide layer was maintained despite the surface amorphisation treatments. It can be assumed that the TiO2 layer is almost identical in unimplanted and implanted surfaces and they will display the same biocompatibility.

Item Type:
Journal Article
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Materials Science and Engineering: A
Uncontrolled Keywords:
?? shape memory alloysx-ray photoelectron spectroscopy amorphisationengineeringmechanics of materialsgeneral materials sciencemechanical engineeringcondensed matter physicsmaterials science(all)ta engineering (general). civil engineering (general) ??
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Deposited On:
16 Oct 2012 15:16
Last Modified:
16 Jul 2024 09:10