Dependence of Morphology, Structure, Composition and Biocompatibility of Ca- and P-Doped TiO2 Coatings on PEO Process Parameters

This study covers the influence of bipolar pulsed regime parameters of titanium plasma electrolytic oxidation (PEO): voltage ( U ), pulse duration ( t ), and pause duration between pulses on the structure and morphology of TiO 2 coatings doped with Ca and P. Threshold values of voltage ( U 1 ) and p...

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Bibliographic Details
Published in:Russian journal of non-ferrous metals 2021-09, Vol.62 (5), p.618-628
Main Authors: Ponomarev, V. A., Kuptsov, K. A., Sheveyko, A. N., Shtansky, D. V.
Format: Article
Language:English
Subjects:
Apatite
Biocompatibility
Biomedical materials
Body fluids
Chemistry and Materials Science
Coatings
Crystallites
Electric potential
Materials Science
Metallic Materials
Morphology
Nanostructured Materials and Functional Coatings
Oxidation
Pore size
Process parameters
Pulse duration
Rutile
Titanium dioxide
Voltage
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Summary:This study covers the influence of bipolar pulsed regime parameters of titanium plasma electrolytic oxidation (PEO): voltage ( U ), pulse duration ( t ), and pause duration between pulses on the structure and morphology of TiO 2 coatings doped with Ca and P. Threshold values of voltage ( U 1 ) and positive pulse duration ( t 1 ), which led to pore-free coating formation, are determined. It is shown that an increase in U 1 leads to an increase in pore size and Ca and P concentration in the TiO 2 coating. A relationship between rutile content in the coating and Ca and P concentrations is identified. It is found that the size and distribution of pores depend on t 1 . A structure with fine pores evenly distributed over the sample area is formed during a short positive pulse. An increase in t 1 leads to the formation of a structure with unevenly distributed large pores. An increase in the values of U 2 and t 2 leads to a decrease in Ca and P concentrations and rutile content in the coating. It is shown that the surface of PEO TiO 2 coatings ensures the growth of crystallites of (Ca, P)-containing phases when kept in a simulated body fluid (SBF) solution. It is found that the amount of apatite-like layer depends on the content of Ca and P in the TiO 2 layer, as well as the size and distribution of pores.
ISSN:1067-8212
1934-970X
DOI:10.3103/S1067821221050187