Lancaster EPrints

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

Full text not available from this repository.

Abstract

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: Article
Journal or Publication Title: Materials Science and Engineering: A
Uncontrolled Keywords: Shape memory alloys ; X-ray photoelectron spectroscopy ; Amorphisation
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 57873
Deposited By: ep_importer_pure
Deposited On: 16 Oct 2012 16:16
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:32
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/57873

Actions (login required)

View Item