Super-elastic Nitinol (NiTi alloys) possesses superior mechanical properties compared to conventional titanium alloys, which-together with a shape memory effect-should predestine them for modem applications. However, a biocompatibility below the excellent values of titanium, coupled with the lurking shadow of nickel outdiffusion presently precludes a widespread use in biomedical applications. It is shown that oxygen ion implantation, especially using plasma immersion ion implantation for three-dimensional objects, is a highly satisfactory method to obtain both objectives. SE 508 substrates were implanted at elevated temperatures with oxygen. Subsequently, the films were investigated using elastic recoil detection analysis (ERDA) and X-ray diffraction (XRD). A closed oxide layer, containing nearly exclusively only titanium and oxygen, was formed with the nickel anti-segregating towards the bulk into a Ni3Ti layer. Thus, an effective diffusion barrier was formed. Higher temperatures than 400 degrees C lead to thermal diffusion of Ni, increasing the Ni concentration in the near surface region. (c) 2004 Elsevier B.V. All rights reserved.
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Natl Inst Space Res INPE, Associated Lab Sensors & Mat LAS, Sao Jose Dos Campos, SP, BrazilNatl Inst Space Res INPE, Associated Lab Sensors & Mat LAS, Sao Jose Dos Campos, SP, Brazil
Nono, MCA
Corat, EJ
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Corat, EJ
Ueda, M
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Stellati, C
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Barroso, JJ
Conrad, JR
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Shamim, M
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Natl Inst Space Res INPE, Associated Lab Sensors & Mat LAS, Sao Jose Dos Campos, SP, BrazilNatl Inst Space Res INPE, Associated Lab Sensors & Mat LAS, Sao Jose Dos Campos, SP, Brazil
Nono, MCA
Corat, EJ
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Corat, EJ
Ueda, M
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Ueda, M
Stellati, C
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Stellati, C
Barroso, JJ
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Barroso, JJ
Conrad, JR
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Conrad, JR
Shamim, M
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Shamim, M
Fetherston, P
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Fetherston, P
Sridharan, K
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