Surface modification of NiTi for orthopaedic braces by plasma immersion ion implantation

被引:39
作者
Mändl, S [1 ]
Gerlach, JW [1 ]
Rauschenbach, B [1 ]
机构
[1] Leibniz Inst Oberflachenmodifizierung, D-04303 Leipzig, Germany
关键词
PIII; NiTi; ERDA; XRD;
D O I
10.1016/j.surfcoat.2004.08.170
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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.
引用
收藏
页码:293 / 297
页数:5
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