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Characterisation of a duplex TiO2/CaP coating on Ti6Al4V for hard tissue replacement
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- Ng, B. S. (author)
- Sch. of Mech. and Prod. Engineering, Division of Materials Engineering, Nanyang Technol. Univ., 50 N., Singapore
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- Annergren, I. (author)
- Singapore Inst. of Mfg. Technology
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- Soutar, A. M. (author)
- Singapore Inst. of Mfg. Technology
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- Sch of Mech. and Prod. Engineering, Division of Materials Engineering, Nanyang Technol. Univ., 50 N., Singapore Singapore Inst. of Mfg. Technology (creator_code:org_t)
- Elsevier BV, 2005
- 2005
- English.
- In: Biomaterials. - : Elsevier BV. - 0142-9612 .- 1878-5905. ; 26:10, s. 1087-1095
- Journal article (peer-reviewed)
Abstract
Subject headings
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- An initial TiO2 coating was applied on Ti6Al4V by electrochemical anodisation in two dissimilar electrolytes. The secondary calcium phosphate (CaP) coating was subsequently applied by immersing the substrates in a simulated body fluid (SBF) with three times concentration (SBF×3), mimicking biomineralisation of biological bone. Electrochemical impedance spectroscopy and potentiodynamic polarisation assessments in SBF revealed that the anodic TiO2 layer is compact, exhibiting up to four-folds improvement in in vitro corrosion resistance over unanodised Ti6Al4V. X-ray photoelectron spectroscopy analysis indicates that the anodic Ti oxide is thicker than air-formed ones with a mixture of TiO2-x compound between the TiO2/Ti interfaces. The morphology of the dense CaP film formed, when observed using scanning electron microscopy, is made up of linked globules 0.1-0.5ÎŒm in diameter without observable delamination. Fourier transform infrared spectrometry with an attenuated total internal reflection analysis revealed that this film is an amorphous/poorly crystallised calcium-deficient-carbonated CaP system. The calculated Ca:P ratios of all samples (1.14-1.28) are lower than stoichiometric hydroxyapatite (1.67). These results show that a duplex coating consisting of (1) a compact TiO2 with enhanced in vitro corrosion resistance and (2) bone-like apatite coating can be applied on Ti6Al4V by anodisation and subsequent immersion in SBF. © 2004 Elsevier Ltd. All rights reserved.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Keyword
- Biocompatibility
- Biomimetic
- Calcium phosphate
- Corrosion
- SBF
- Titanium oxide
- Body fluids
- Calcium compounds
- Characterization
- Corrosion resistance
- Crystallization
- Delamination
- Electrochemistry
- Electrolytes
- Fourier transform infrared spectroscopy
- Scanning electron microscopy
- Stoichiometry
- Titanium oxides
- Calcium phosphate (CaP)
- Potentiodynamic polarization
- Simulated body fluids (SBF)
- Bone
- biomaterial
- calcium
- carbon
- electrolyte
- titanium dioxide
- biomimetic material
- titanium
- titanium alloy (TiAl6V4)
- article
- body fluid
- bone mineralization
- computer interface
- concentration response
- correlation analysis
- cross linking
- electrode
- film
- Fourier analysis
- immersion
- impedance
- material coating
- polarization
- potentiometry
- priority journal
- reaction analysis
- simulation
- structure analysis
- thickness
- tissue engineering
- tissue repair
- X ray photoelectron spectroscopy
- bone prosthesis
- chemistry
- evaluation
- materials testing
- surface property
- Biomimetic Materials
- Bone Substitutes
- Calcium Phosphates
- Coated Materials
- Biocompatible
- Surface Properties
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Ng, B. S.
- Annergren, I.
- Soutar, A. M.
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- Biomaterials
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- Jönköping University
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