Nanostructured titania/hydroxyapatite composite coatings deposited by high velocity oxy-fuel (HVOF) spraying

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DOIResolve DOI: http://doi.org/10.1016/j.msea.2006.12.090
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TypeArticle
Journal titleMaterials science and engineering A
Volume458
Issue1-2
Pages141149; # of pages: 9
SubjectThermal spray; High velocity oxy-fuel (HVOF); Nanostructured titania (TiO₂); Hydroxyapatite (HA); Titania-hydroxyapatite; Mechanical performance
AbstractPure nanostructured titania (TiO₂) and blends with 10 and 20 wt% hydroxyapatite (HA) powders were sprayed onto Ti–6Al–4V substrates using a high velocity oxy-fuel (HVOF) system. The feedstock powders employed in this work were engineered to exhibit similar particle size distributions in order to generate similar values of particle temperature and velocity in the spray jet. By achieving these characteristics it was assumed that the differences in coating properties and microstructures produced in this study were mainly related to the nature and composition of the feedstock powders, rather than to the spraying parameters or in-flight particle characteristics. The microstructure, porosity, roughness, Vickers hardness and bond strength (ASTM C633) of these coatings were analyzed and evaluated. X-ray diffraction (XRD) patterns showed that no detectable chemical reaction occurred between the nanostructured TiO₂ and HA phases during the spray process. Due to the poor mechanical performance of HA, its addition decreased the bond strength and hardness values of the coatings, especially when the content of HA was 20 wt%; however, the bond strength values were still much superior to those of HA thermally sprayed coatings. The addition of HA to nanostructured titania for producing HVOF-sprayed coatings could be very interesting for biomedical applications due to the combination of the good mechanical performance and chemical stability of nanostructured titania and a bioactive phase (HA) that can enhance the bio-performance of the coating.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number48939
NPARC number15774987
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Record identifier25bd2235-175c-4d39-87a4-0d8d5bd526c8
Record created2010-07-06
Record modified2016-05-09
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