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Article: Characterization and corrosion studies of titania-coated NiTi prepared by sol-gel technique and steam crystallization

TitleCharacterization and corrosion studies of titania-coated NiTi prepared by sol-gel technique and steam crystallization
Authors
KeywordsCorrosion Resistance
Crystallization
Niti
Sol-Gel Coating
Tio2
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsusc
Citation
Applied Surface Science, 2007, v. 253 n. 16, p. 6762-6768 How to Cite?
AbstractNickel titanium (NiTi) was dip-coated with titania via the sol-gel route using titanium butoxide (Ti(OC4H9)4) as precursor. The as-coated titania film was crystallized to form anatase by treatment in steam at 105 °C. The crystallized film was relatively thick (about 750 nm) and even. Atomic force microscopy (AFM) revealed that the film was dense with a surface roughness of about 3 nm, and was composed of particles of about 100 nm. X-ray diffractometry (XRD) showed that these particles were composed of nanocrystallites of a few nanometers. Nanoindentation tests of the titania film indicated that the film was tough, possibly due to the nano-size of the crystallites. The mean hardness H and elastic modulus E of the coating were about 1.5 and 70 GPa, respectively. Direct pull-off test recorded a mean coating-substrate bonding strength larger than 17 MPa. Electrochemical impedance spectroscopic (EIS) study and cyclic polarization tests showed that the corrosion resistance of the coated NiTi samples in Hanks' solution was increased by about two orders of magnitude compared with the substrate. Taken together, the present study showed that steam crystallization is a feasible low-temperature treatment method for sol-gel derived titania coating on NiTi in biomedical applications. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/170103
ISSN
2015 Impact Factor: 3.15
2015 SCImago Journal Rankings: 0.930
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChiu, KYen_US
dc.contributor.authorWong, MHen_US
dc.contributor.authorCheng, FTen_US
dc.contributor.authorMan, HCen_US
dc.date.accessioned2012-10-30T06:05:19Z-
dc.date.available2012-10-30T06:05:19Z-
dc.date.issued2007en_US
dc.identifier.citationApplied Surface Science, 2007, v. 253 n. 16, p. 6762-6768en_US
dc.identifier.issn0169-4332en_US
dc.identifier.urihttp://hdl.handle.net/10722/170103-
dc.description.abstractNickel titanium (NiTi) was dip-coated with titania via the sol-gel route using titanium butoxide (Ti(OC4H9)4) as precursor. The as-coated titania film was crystallized to form anatase by treatment in steam at 105 °C. The crystallized film was relatively thick (about 750 nm) and even. Atomic force microscopy (AFM) revealed that the film was dense with a surface roughness of about 3 nm, and was composed of particles of about 100 nm. X-ray diffractometry (XRD) showed that these particles were composed of nanocrystallites of a few nanometers. Nanoindentation tests of the titania film indicated that the film was tough, possibly due to the nano-size of the crystallites. The mean hardness H and elastic modulus E of the coating were about 1.5 and 70 GPa, respectively. Direct pull-off test recorded a mean coating-substrate bonding strength larger than 17 MPa. Electrochemical impedance spectroscopic (EIS) study and cyclic polarization tests showed that the corrosion resistance of the coated NiTi samples in Hanks' solution was increased by about two orders of magnitude compared with the substrate. Taken together, the present study showed that steam crystallization is a feasible low-temperature treatment method for sol-gel derived titania coating on NiTi in biomedical applications. © 2007 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsuscen_US
dc.relation.ispartofApplied Surface Scienceen_US
dc.subjectCorrosion Resistanceen_US
dc.subjectCrystallizationen_US
dc.subjectNitien_US
dc.subjectSol-Gel Coatingen_US
dc.subjectTio2en_US
dc.titleCharacterization and corrosion studies of titania-coated NiTi prepared by sol-gel technique and steam crystallizationen_US
dc.typeArticleen_US
dc.identifier.emailChiu, KY:pkychiu@hkucc.hku.hken_US
dc.identifier.authorityChiu, KY=rp00379en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.apsusc.2007.01.121en_US
dc.identifier.scopuseid_2-s2.0-34248361185en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34248361185&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume253en_US
dc.identifier.issue16en_US
dc.identifier.spage6762en_US
dc.identifier.epage6768en_US
dc.identifier.isiWOS:000247156100015-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridChiu, KY=7202988127en_US
dc.identifier.scopusauthoridWong, MH=25651162500en_US
dc.identifier.scopusauthoridCheng, FT=7202811219en_US
dc.identifier.scopusauthoridMan, HC=7102326766en_US

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