Materials & Processes for Medical Devices (August 10- 13): Surface Modification of Ni-Ti SMA by Nitrogen Plasma Immersion Ion Implantation – Preliminary Results

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9.5 Surface Modification of Ni-Ti SMA by Nitrogen Plasma Immersion Ion Implantation – Preliminary Results

Tuesday, August 11, 2009
Salon D (Exhibit Hall) (Hilton Minneapolis )
Mrs. Eliene Nogueira de Camargo , Instituto Tecnologico de Aeronautica, S. J. dos Campos, Brazil
Dr. Silmara Baldissera , Instituto Tecnologico de Aeronautica, S. J. dos Campos, Brazil
Maria M. da Silva , Instituto Tecnologico de Aeronautica, S. J. dos Campos, Brazil
Dr. Mario Ueda , National Institute for Space Research, S. J. dos Campos, Brazil
Jorge Otubo , Instituto Tecnologico de Aeronautica, S. J. dos Campos, Brazil
Although Nickel–titanium (NiTi) shape memory alloys are promising materials as a biomaterial due to their shape memory and superelastic properties, there is one concern which is the out-diffusion of nickel causing toxic reactions in humans, mainly in nickel hyper-sensitive patients. This work presents some preliminary results of surface modification by nitrogen implantation by plasma immersion ion implantation (PIII) in NiTi SMA. The nitrogen diffusion layer will be analyzed by Auger Spectroscopy and mechanical properties by nanoindentation techniques. The nickel release will be analyzed by immersion test on physiological serum at 37 oC and corrosion resistance by electrochemical measurements techniques as potentiodynamic polarization and electrochemical impedance measurement.
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