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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
2012 Impact Factor: 1.266
2012 SCImago Journal Rankings: 0.593
 
DOIhttp://dx.doi.org/10.1016/j.nimb.2005.05.030
 
ISI Accession Number IDWOS:000231543000077
 
ReferencesReferences in Scopus
 
DC FieldValue
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
2012 Impact Factor: 1.266
2012 SCImago Journal Rankings: 0.593
 
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
 
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<contributor.author>Cheung, KMC</contributor.author>
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<description.abstract>Nickel-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+. &#169; 2005 Elsevier B.V. All rights reserved.</description.abstract>
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Author Affiliations
  1. The University of Hong Kong
  2. City University of Hong Kong