Conference Paper: Improvements of anti-corrosion and mechanical properties of NiTi orthopedic materials by acetylene, nitrogen and oxygen plasma immersion ion implantation

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TitleImprovements of anti-corrosion and mechanical properties of NiTi orthopedic materials by acetylene, nitrogen and oxygen plasma immersion ion implantation
AuthorsPoon, RWY2
Ho, JPY2
Liu, X2
Chung, CY2
Chu, PK2
Yeung, KWK1
Lu, WW1
Cheung, KMC1
KeywordsCorrosion resistance
Diffusion barrier
NiTi shape memory alloys
Plasma immersion ion implantation
Issue Date2005
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/nimb
CitationNuclear Instruments And Methods In Physics Research, Section B: Beam Interactions With Materials And Atoms, 2005, v. 237 n. 1-2, p. 411-416 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.nimb.2005.05.030
AbstractNickel-titanium shape memory alloys (NiTi) are useful materials in orthopedics and orthodontics due to their unique super-elasticity and shape memory effects. However, the problem associated with the release of harmful Ni ions to human tissues and fluids has been raising safety concern. Hence, it is necessary to produce a surface barrier to impede the out-diffusion of Ni ions from the materials. We have conducted acetylene, nitrogen and oxygen plasma immersion ion implantation (PIII) into NiTi alloys in an attempt to improve the surface properties. All the implanted and annealed samples surfaces exhibit outstanding corrosion and Ni out-diffusion resistance. Besides, the implanted layers are mechanically stronger than the substrate underneath. XPS analyses disclose that the layer formed by C2H2 PIII is composed of mainly TiCx with increasing Ti to C concentration ratios towards the bulk. The nitrogen PIII layer is observed to be TiN, whereas the oxygen PIII layer is composed of oxides of Ti4+, Ti3+ and Ti 2+. © 2005 Elsevier B.V. All rights reserved.
ISSN0168-583X
2011 Impact Factor: 1.211
2011 SCImago Journal Rankings: 0.088
DOIhttp://dx.doi.org/10.1016/j.nimb.2005.05.030
ISI Accession Number IDWOS:000231543000077
ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorPoon, RWY
dc.contributor.authorHo, JPY
dc.contributor.authorLiu, X
dc.contributor.authorChung, CY
dc.contributor.authorChu, PK
dc.contributor.authorYeung, KWK
dc.contributor.authorLu, WW
dc.contributor.authorCheung, KMC
dc.date.accessioned2011-09-23T05:51:15Z
dc.date.available2011-09-23T05:51:15Z
dc.date.issued2005
dc.description.abstractNickel-titanium shape memory alloys (NiTi) are useful materials in orthopedics and orthodontics due to their unique super-elasticity and shape memory effects. However, the problem associated with the release of harmful Ni ions to human tissues and fluids has been raising safety concern. Hence, it is necessary to produce a surface barrier to impede the out-diffusion of Ni ions from the materials. We have conducted acetylene, nitrogen and oxygen plasma immersion ion implantation (PIII) into NiTi alloys in an attempt to improve the surface properties. All the implanted and annealed samples surfaces exhibit outstanding corrosion and Ni out-diffusion resistance. Besides, the implanted layers are mechanically stronger than the substrate underneath. XPS analyses disclose that the layer formed by C2H2 PIII is composed of mainly TiCx with increasing Ti to C concentration ratios towards the bulk. The nitrogen PIII layer is observed to be TiN, whereas the oxygen PIII layer is composed of oxides of Ti4+, Ti3+ and Ti 2+. © 2005 Elsevier B.V. All rights reserved.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationNuclear Instruments And Methods In Physics Research, Section B: Beam Interactions With Materials And Atoms, 2005, v. 237 n. 1-2, p. 411-416 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.nimb.2005.05.030
dc.identifier.doihttp://dx.doi.org/10.1016/j.nimb.2005.05.030
dc.identifier.epage416
dc.identifier.hkuros192135
dc.identifier.isiWOS:000231543000077
dc.identifier.issn0168-583X
2011 Impact Factor: 1.211
2011 SCImago Journal Rankings: 0.088
dc.identifier.issue1-2
dc.identifier.openurl
dc.identifier.scopuseid_2-s2.0-23644434982
dc.identifier.spage411
dc.identifier.urihttp://hdl.handle.net/10722/139530
dc.identifier.volume237
dc.languageeng
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/nimb
dc.publisher.placeNetherlands
dc.relation.ispartofNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
dc.relation.referencesReferences in Scopus
dc.subjectCorrosion resistance
dc.subjectDiffusion barrier
dc.subjectNiTi shape memory alloys
dc.subjectPlasma immersion ion implantation
dc.titleImprovements of anti-corrosion and mechanical properties of NiTi orthopedic materials by acetylene, nitrogen and oxygen plasma immersion ion implantation
dc.typeConference_Paper
Author Affiliations
  1. The University of Hong Kong
  2. City University of Hong Kong