Article: Mechanical performance of apatite/TiO2 composite coatings formed on Ti and NiTi shape memory alloy

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Publisher Website: 10.1016/j.apsusc.2008.06.070
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Title	Mechanical performance of apatite/TiO2 composite coatings formed on Ti and NiTi shape memory alloy
Authors	Sun, T1 Wang, M1
Keywords	Apatite Composite coating Friction Nanoindentation NiTi Scratch Ti TiO2
Issue Date	2008
Publisher	Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsusc
Citation	Applied Surface Science, 2008, v. 255 n. 2, p. 404-408 [How to Cite?] DOI: http://dx.doi.org/10.1016/j.apsusc.2008.06.070
Abstract	To make metals bioactive for orthopaedic applications, apatite/TiO2 composite coatings were formed on Ti and NiTi shape memory alloy (SMA) using a H2O2-oxidation and hot water aging technique and the subsequent accelerated biomimetic process. In the current investigation, nanoindentation, scratch testing and frictional testing were employed to assess mechanical properties and the adhesion of apatite/TiO2 composite coatings formed on Ti and NiTi SMA. Nanoindentation testing conducted on cross-sections of composite coatings indicated that there was no significant difference in nanohardness and elastic modulus between apatite/TiO2 composite coatings formed on Ti and NiTi SMA samples. The enhancement of the adhesion between the apatite layer and the metal substrates arose from the TiO2 intermediate layer in the composite coating. The highest values of coating adhesion strength for Ti and NiTi SMA samples, as measured by scratch tests, were 22.58 N and 19.07 N, respectively. However, compared to corresponding Ti samples, NiTi SMA samples had better tribological properties. © 2008 Elsevier B.V. All rights reserved.
ISSN	0169-4332 2011 Impact Factor: 2.103 2011 SCImago Journal Rankings: 0.156
DOI	http://dx.doi.org/10.1016/j.apsusc.2008.06.070
ISI Accession Number ID	WOS:000260510600041
References	References in Scopus

DC Field	Value
dc.contributor.author	Sun, T
dc.contributor.author	Wang, M
dc.date.accessioned	2010-05-31T03:41:04Z
dc.date.available	2010-05-31T03:41:04Z
dc.date.issued	2008
dc.description.abstract	To make metals bioactive for orthopaedic applications, apatite/TiO2 composite coatings were formed on Ti and NiTi shape memory alloy (SMA) using a H2O2-oxidation and hot water aging technique and the subsequent accelerated biomimetic process. In the current investigation, nanoindentation, scratch testing and frictional testing were employed to assess mechanical properties and the adhesion of apatite/TiO2 composite coatings formed on Ti and NiTi SMA. Nanoindentation testing conducted on cross-sections of composite coatings indicated that there was no significant difference in nanohardness and elastic modulus between apatite/TiO2 composite coatings formed on Ti and NiTi SMA samples. The enhancement of the adhesion between the apatite layer and the metal substrates arose from the TiO2 intermediate layer in the composite coating. The highest values of coating adhesion strength for Ti and NiTi SMA samples, as measured by scratch tests, were 22.58 N and 19.07 N, respectively. However, compared to corresponding Ti samples, NiTi SMA samples had better tribological properties. © 2008 Elsevier B.V. All rights reserved.
dc.description.nature	Link_to_subscribed_fulltext
dc.identifier.citation	Applied Surface Science, 2008, v. 255 n. 2, p. 404-408 [How to Cite?] DOI: http://dx.doi.org/10.1016/j.apsusc.2008.06.070
dc.identifier.doi	http://dx.doi.org/10.1016/j.apsusc.2008.06.070
dc.identifier.epage	408
dc.identifier.hkuros	157732
dc.identifier.isi	WOS:000260510600041
dc.identifier.issn	0169-4332 2011 Impact Factor: 2.103 2011 SCImago Journal Rankings: 0.156
dc.identifier.issue	2
dc.identifier.openurl
dc.identifier.scopus	eid_2-s2.0-54349093254
dc.identifier.spage	404
dc.identifier.uri	http://hdl.handle.net/10722/58994
dc.identifier.volume	255
dc.language	eng
dc.publisher	Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsusc
dc.publisher.place	Netherlands
dc.relation.ispartof	Applied Surface Science
dc.relation.references	References in Scopus
dc.rights	Applied Surface Science. Copyright © Elsevier BV.
dc.subject	Apatite
dc.subject	Composite coating
dc.subject	Friction
dc.subject	Nanoindentation
dc.subject	NiTi
dc.subject	Scratch
dc.subject	Ti
dc.subject	TiO2
dc.title	Mechanical performance of apatite/TiO2 composite coatings formed on Ti and NiTi shape memory alloy
dc.type	Article

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The University of Hong Kong

Article: Mechanical performance of apatite/TiO2 composite coatings formed on Ti and NiTi shape memory alloy

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