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Characterization and corrosion behavior of hydroxyapatite coatings on Ti6Al4V fabricated by electrophoretic deposition
C.T. Kwok1; P.K. Wong1; F.T. Cheng2; H.C. Man3
2009-04-15
Source PublicationApplied Surface Science
ISSN0169-4332
Volume255Issue:13-14Pages:6736-6744
Abstract

In order to increase the bone bioactivity of the metallic implants, hydroxyapatite (HA) is often coated on their surface so that a real bond with the surrounding bone tissue can be formed. Plasma spraying of HA coatings is currently the only commercial process in use but long-term stability of plasma sprayed coatings could be a problem because of their high degree of porosities, poor bond strength, presence of a small amount of amorphous phase with non-stoichiometric composition, and non-uniformity. In the present study, cathodic electrophoretic deposition (EPD) has been attempted for depositing HA coatings on Ti6Al4V followed by vacuum sintering at 800 °C. Submicron HA powders with different morphologies including spherical, needle-shaped and flake-shaped were used in the EDP process to produce dense coatings. Moreover, carbon nanotubes (CNTs) were also used to reinforce the HA coating for enhancing its hardness. The surface morphology, compositions and microstructure of the HA coated Ti6Al4V were investigated by electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffractometry, respectively. Electrochemical corrosion behavior of the HA coatings in Hanks' solution at 37 °C was investigated by means of open-circuit potential measurement and cyclic potentiodynamic polarization tests. Surface hardness, adhesion strength and bone bioactivity of the coatings were also studied. All HA coated specimens had a thickness of about 10 μm and free of cracks, with corrosion resistance higher than that of the substrate and adhesion strength higher than that of plasma sprayed coating. The enhanced properties could be attributed to the use of submicron-sized HA particles in the low-temperature EDP process. Among the three types of HA powder, spherical powder yielded the densest coating whereas the flake-shaped powder yielded the most porous coatings. Compared with monolithic HA coating, the CNT-reinforced HA coating markedly increased the coating hardness without compromising the corrosion resistance or adhesion strength. 

KeywordAdhesion Corrosion Electrophoretic Deposition Hydroxyapatite Implants
DOIhttps://doi.org/10.1016/j.apsusc.2009.02.086
URLView the original
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Materials Science ; Physics
WOS SubjectChemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000264925400054
PublisherELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
The Source to ArticleScopus
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Cited Times [WOS]:162   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Corresponding AuthorF.T. Cheng
Affiliation1.Department of Electromechanical Engineering, University of Macau, Macau, China
2.Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
3.Department of Industrial & Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
C.T. Kwok,P.K. Wong,F.T. Cheng,et al. Characterization and corrosion behavior of hydroxyapatite coatings on Ti6Al4V fabricated by electrophoretic deposition[J]. Applied Surface Science,2009,255(13-14):6736-6744.
APA C.T. Kwok,P.K. Wong,F.T. Cheng,&H.C. Man.(2009).Characterization and corrosion behavior of hydroxyapatite coatings on Ti6Al4V fabricated by electrophoretic deposition.Applied Surface Science,255(13-14),6736-6744.
MLA C.T. Kwok,et al."Characterization and corrosion behavior of hydroxyapatite coatings on Ti6Al4V fabricated by electrophoretic deposition".Applied Surface Science 255.13-14(2009):6736-6744.
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