Characterisation of a duplex TiO2/CaP coating on Ti6Al4V for hard tissue replacement

• 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Nyckelord

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

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