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Conference Paper: Suppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment

TitleSuppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment
Authors
Issue Date2011
PublisherSpringer
Citation
The International Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology, 2011, p. 112-113 How to Cite?
Abstract
Nickel-titanium shape-memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment. NiTi discs with 50.8% Ni were treated by nitrogen, oxygen and carbon PIII at 40kV with the frequency of 200Hz. The treated samples were then subjected to chemical analysis by X-ray Photoelectron Spectroscopy (XPS) and electrochemical corrosion testing by potentiometer. After completing the corrosion test, the solutions were extracted for ICPMS analysis so as to investigate the amount of Ni release. Cytocompatibility of PIII treated samples using mouse osteoblasts and in-vivo compatibility were also examined. By reading the XPS results, the surfaces were enriched by titanium nitride (TiN), titanium oxide (TiO) and titanium carbide (TiC) after PIII treatments, respectively. The surface Ni concentration of all treated samples was significantly suppressed. To compare with the untreated sample, the corrosion properties of the plasma treated samples had been improved by a factor of five. The leached Ni levels from the treated samples were undetectable, whereas that from the untreated samples was 30ppm. Cells were well tolerated on plasma treated and untreated samples at Day 7 of culturing. Although there was no significant difference in cell proliferation on either surfaces, the in vivo bone formation was found to be better on the nitrogen and carbon treated surfaces at every time points. Therefore, the treated NiTi is promising orthopedic implantation without inducing harmful effects. SUMMARY: Nickel-titanium shape memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment.
Persistent Identifierhttp://hdl.handle.net/10722/126583
ISBN

 

DC FieldValueLanguage
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorWu, SLen_HK
dc.contributor.authorTu, Hen_HK
dc.contributor.authorChu, PKen_HK
dc.contributor.authorLiu, XYen_HK
dc.contributor.authorLu, WWen_HK
dc.contributor.authorLuk, KDKen_HK
dc.contributor.authorCheung, KMCen_HK
dc.date.accessioned2010-10-31T12:36:53Z-
dc.date.available2010-10-31T12:36:53Z-
dc.date.issued2011en_HK
dc.identifier.citationThe International Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology, 2011, p. 112-113en_HK
dc.identifier.isbn978-1-4614-0197-1-
dc.identifier.urihttp://hdl.handle.net/10722/126583-
dc.description.abstractNickel-titanium shape-memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment. NiTi discs with 50.8% Ni were treated by nitrogen, oxygen and carbon PIII at 40kV with the frequency of 200Hz. The treated samples were then subjected to chemical analysis by X-ray Photoelectron Spectroscopy (XPS) and electrochemical corrosion testing by potentiometer. After completing the corrosion test, the solutions were extracted for ICPMS analysis so as to investigate the amount of Ni release. Cytocompatibility of PIII treated samples using mouse osteoblasts and in-vivo compatibility were also examined. By reading the XPS results, the surfaces were enriched by titanium nitride (TiN), titanium oxide (TiO) and titanium carbide (TiC) after PIII treatments, respectively. The surface Ni concentration of all treated samples was significantly suppressed. To compare with the untreated sample, the corrosion properties of the plasma treated samples had been improved by a factor of five. The leached Ni levels from the treated samples were undetectable, whereas that from the untreated samples was 30ppm. Cells were well tolerated on plasma treated and untreated samples at Day 7 of culturing. Although there was no significant difference in cell proliferation on either surfaces, the in vivo bone formation was found to be better on the nitrogen and carbon treated surfaces at every time points. Therefore, the treated NiTi is promising orthopedic implantation without inducing harmful effects. SUMMARY: Nickel-titanium shape memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment.-
dc.languageengen_HK
dc.publisherSpringer-
dc.relation.ispartofSMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology-
dc.titleSuppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatmenten_HK
dc.typeConference_Paperen_HK
dc.identifier.emailYeung, KWK: wkkyeung@hkucc.hku.hken_HK
dc.identifier.emailLu, WW: wwlu@hkusua.hku.hken_HK
dc.identifier.emailLuk, KDK: hrmoldk@hkucc.hku.hken_HK
dc.identifier.emailCheung, KMC: cheungmc@hku.hken_HK
dc.identifier.hkuros173206en_HK
dc.identifier.spage112en_HK
dc.identifier.epage113en_HK
dc.description.otherThe International Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology, 2011, p. 112-113-

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