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Conference Paper: Alterations of surface mechanics of nickel titanium shape memory alloys after plasma surface treatment

TitleAlterations of surface mechanics of nickel titanium shape memory alloys after plasma surface treatment
Authors
Issue Date2011
PublisherSpringer
Citation
International Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications, 2011, p. 110-111 How to Cite?
AbstractOrthopaedic implant constructs usually involve the assembling of metallic screws, plates and rods in which fretting is always expected at implant junctions. Metallic debris is suspected to be associated with post-operative infections. Nickel-titanium (NiTi) shape memory alloy has potential as an orthopedic implant. However, nickel particulate debris released from these materials remains a concern. We have therefore enhanced its surface mechanical properties by using plasma immersion ion implantation (PIII). The current paper presents the surface mechanical properties of the nitrogen PIII treated NiTi materials as compared with that of untreated NiTi, medical grade stainless steel and titanium alloy samples. The surface chemistry of the untreated and implanted samples was examined by X-ray photoelectron spectroscopy (XPS) survey scan. Nano-indentation and scratching tests were conducted to identify the surface hardness and E modulus of all the samples. The XPS survey-scan results revealed that TiN and TiO2 and small amounts of NiO were detected on the nitrogen-implanted surfaces. However, the depth profile of the nitrogen treated sample suggested that the NiO concentration was very low as compared with that on the untreated NiTi. Nano-indentation results suggested that the hardness of the nitrogen treated surface was generally higher than that of the untreated NiTi substrate at superficial layer. Compared to the stainless steel, the hardness of the nitrogen treated layer in the layer of 25 nm was higher. However, it was lower than that of the Ti sample except at the topmost region. In summary, the surface hardness of the nitrogen treated NiTi was more superior than that of the untreated NiTi and SS samples, but inferior to that of Ti. SUMMARY: Orthopaedic implant constructs usually involve the assembling of metallic screws, plates and rods in which fretting is always expected at implant junctions. Metallic debris is suspected to be associated with post-operative infections. The current paper presents the surface mechanical properties of the nitrogen PIII treated NiTi materials as compared with that of untreated NiTi, medical grade stainless steel and titanium alloy samples.
Persistent Identifierhttp://hdl.handle.net/10722/126649
ISBN

 

DC FieldValueLanguage
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorWu, SLen_HK
dc.contributor.authorHu, Ten_HK
dc.contributor.authorChu, PKen_HK
dc.contributor.authorLiu, Xen_HK
dc.contributor.authorLu, WWen_HK
dc.contributor.authorLuk, KDKen_HK
dc.contributor.authorCheung, KMCen_HK
dc.date.accessioned2010-10-31T12:40:29Z-
dc.date.available2010-10-31T12:40:29Z-
dc.date.issued2011en_HK
dc.identifier.citationInternational Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications, 2011, p. 110-111en_HK
dc.identifier.isbn978-1-4614-0197-1-
dc.identifier.urihttp://hdl.handle.net/10722/126649-
dc.description.abstractOrthopaedic implant constructs usually involve the assembling of metallic screws, plates and rods in which fretting is always expected at implant junctions. Metallic debris is suspected to be associated with post-operative infections. Nickel-titanium (NiTi) shape memory alloy has potential as an orthopedic implant. However, nickel particulate debris released from these materials remains a concern. We have therefore enhanced its surface mechanical properties by using plasma immersion ion implantation (PIII). The current paper presents the surface mechanical properties of the nitrogen PIII treated NiTi materials as compared with that of untreated NiTi, medical grade stainless steel and titanium alloy samples. The surface chemistry of the untreated and implanted samples was examined by X-ray photoelectron spectroscopy (XPS) survey scan. Nano-indentation and scratching tests were conducted to identify the surface hardness and E modulus of all the samples. The XPS survey-scan results revealed that TiN and TiO2 and small amounts of NiO were detected on the nitrogen-implanted surfaces. However, the depth profile of the nitrogen treated sample suggested that the NiO concentration was very low as compared with that on the untreated NiTi. Nano-indentation results suggested that the hardness of the nitrogen treated surface was generally higher than that of the untreated NiTi substrate at superficial layer. Compared to the stainless steel, the hardness of the nitrogen treated layer in the layer of 25 nm was higher. However, it was lower than that of the Ti sample except at the topmost region. In summary, the surface hardness of the nitrogen treated NiTi was more superior than that of the untreated NiTi and SS samples, but inferior to that of Ti. SUMMARY: Orthopaedic implant constructs usually involve the assembling of metallic screws, plates and rods in which fretting is always expected at implant junctions. Metallic debris is suspected to be associated with post-operative infections. The current paper presents the surface mechanical properties of the nitrogen PIII treated NiTi materials as compared with that of untreated NiTi, medical grade stainless steel and titanium alloy samples.-
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.titleAlterations of surface mechanics of nickel titanium shape memory alloys after 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.hkuros172968en_HK
dc.identifier.spage110en_HK
dc.identifier.epage111en_HK
dc.description.otherInternational Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications, 2011, p. 110-111-

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