Carbon plasma immersion ion implantation of nickel-titanium shape memory alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • R. W Y Poon
  • K. W K Yeung
  • X. Y. Liu
  • W. W. Lu
  • K. M C Cheung
  • D. Chan

Detail(s)

Original languageEnglish
Pages (from-to)2265-2272
Journal / PublicationBiomaterials
Volume26
Issue number15
Publication statusPublished - May 2005

Abstract

Nickel-titanium (NiTi) shape memory alloys possess super-elasticity in addition to the well-known shape memory effect and are potentially suitable for orthopedic implants. However, a critical concern is the release of harmful Ni ions from the implants into the living tissues. We propose to enhance the corrosion resistance and other surface and biological properties of NiTi using carbon plasma immersion ion implantation and deposition (PIII&D). Our corrosion and simulated body fluid tests indicate that either an ion-mixed amorphous carbon coating fabricated by PIII&D or direct carbon PIII can drastically improve the corrosion resistance and block the out-diffusion of Ni from the materials. Our tribological tests show that the treated surfaces are mechanically more superior and cytotoxicity tests reveal that both sets of plasma-treated samples favor adhesion and proliferation of osteoblasts. © 2004 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Corrosion resistance, Mechanical properties, NiTi shape memory alloys, Orthopedic implants, Osteoblasts

Citation Format(s)

Carbon plasma immersion ion implantation of nickel-titanium shape memory alloys. / Poon, R. W Y; Yeung, K. W K; Liu, X. Y.; Chu, P. K.; Chung, C. Y.; Lu, W. W.; Cheung, K. M C; Chan, D.

In: Biomaterials, Vol. 26, No. 15, 05.2005, p. 2265-2272.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal