Abstract
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 TiO2 coatings doped with Ca and P. Threshold values of voltage (U1) and positive pulse duration (t1), which led to pore-free coating formation, are determined. It is shown that an increase in U1 leads to an increase in pore size and Ca and P concentration in the TiO2 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 t1. A structure with fine pores evenly distributed over the sample area is formed during a short positive pulse. An increase in t1 leads to the formation of a structure with unevenly distributed large pores. An increase in the values of U2 and t2 leads to a decrease in Ca and P concentrations and rutile content in the coating. It is shown that the surface of PEO TiO2 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 TiO2 layer, as well as the size and distribution of pores.
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ACKNOWLEDGMENTS
This study was funded by the Russian Foundation for Basic Research as part of Scientific Project no. 19-38-90249\19.
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Ponomarev, V.A., Kuptsov, K.A., Sheveyko, A.N. et al. Dependence of Morphology, Structure, Composition and Biocompatibility of Ca- and P-Doped TiO2 Coatings on PEO Process Parameters. Russ. J. Non-ferrous Metals 62, 618–628 (2021). https://doi.org/10.3103/S1067821221050187
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DOI: https://doi.org/10.3103/S1067821221050187