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Morphology of coatings on titanium alloy with the addition of biocomponents
(Луцьк: ЛНТУ, 2024-10-05) Povstianoi, Oleksandr; Imbirovych, Nataliia
In this work, the method of plasma electrolytic oxidation on a titanium alloy with the introduction of calcium-containing components and bioadditives in the form of diatomite into the coating is widespread. In order to increase the biocompatibility of the synthesized surface, working environments and coating application modes were developed. The study of the stage nature of PEO in such electrolytes allowed predicting the properties of coatings in the future depending on the requirements for their roughness.
Formation of Coatings on Titanium Alloys Saturated with Biocomponents by the PEO Method
(Cham: Springer, 2025-02-14) Povstyanoy, Oleksandr; Imbirovych, Nataliia; Boiarska, Inna; Nykoliuk, Tamara
In the work, the influence of the composition of the electrolyte on the elec-trophysical parameters of the synthesis of coatings with increased biocom-patible properties was studied. It was established that under conditions of increased electrolyte concentration, the voltage at which the coating is syn-thesized decreases. This effect can be explained by the thermodynamic Gibbs conditions. According to these conditions, the system needs more energy when the medium contains more elements, which must also con-sume a certain amount of energy. The authors found that sodium salts in-crease the conductivity of the working environment. This effect affects the speed of the synthesis process and can reduce the cost of the energy re-serve of the system as a whole. Spectral analysis established that during the synthesis of a titanium alloy in an alkaline electrolyte, an equilibrium non-degenerate quasi-ideal plasma is realized in the discharge channel with a temperature of (1...1,1)×104 K and an electron density of (3,2...3,4)×1022 m-3. It is under these conditions that molecules dissociate into ions and interact with the components of the elec-trolyte, which leads to oxidation of the surface of valve metals and the formation of stable compounds with high biocompatible properties.
Production and Surface Research of a New Material with the Addition of Diatomite for Potential Filtration Applications
(Cham: Springer, 2025-07-12) Povstyanoy, Oleksandr; Imbirovych, Nataliia; Smetjukh, Bohdan; Karbovska, Yuliia
This work is dedicated to the research and study of the possibility of using Natural minerals such as Diatomaceous Earth (diatoms) for filtering various environments. The extraordinary progress and prospects of diatomaceous earth (DE) as a biomatrix material for creating porous materials are relevant and interesting. The unique structures of DE, including its mesoporosity and large surface area, have made it a key material for the filtration process. Its biotemplating ability can initiate the creation of highly efficient porous permeable materials. Its sufficient natural abundance and ecological properties are consistent with the increasing emphasis on sustainability in environmental solutions. Its complex structures and biotemplating capabilities will pave a compelling path in the future for the advancement of sustainable, highly efficient solutions for filtering environments, marking a significant step towards a more ecological and efficient future for humanity. This research paper explores the potential of DE as a bio-matrix material for creating a permeable material without delving into the complex filtration processes. Previous studies have shown that the use of Diatomaceous Earth with titanium powder in various proportions allows us to talk about the possibility of creating highly efficient porous permeable materials with branched porosity even for drinking water filtration
Evaluation of the surface characteristics of VT8 titanium alloy bio-functionalized through plasma electrolytic oxidation
(2024-03-15) Povstyanoy, Oleksandr; Imbirovych, Nataliia; Zvirko, Olha
Titanium and its alloys are considered promising materials in the medical field due to a number of mechanical and corrosion properties, as well as biocompatibility. In order to improve the operational properties of such alloys, their surface is modified by various methods, particularly plasma-electrolytic oxidation (PEO). The main feature of the PEO method is the wide possibility of controlling the physical and mechanical properties of coatings by changing the electrolyte composition and operating modes. These include hardness as one of the important functional properties of oxide-ceramic biocompatible coatings which can be changed in a wide range. The hardness should be controlled to avoid brittle fracture of coatings. In this work, a number of PEO regimes were developed by varying the electrolyte composition, the ratio of anodic to cathodic currents, and the treatment duration. Coatings with a hardness in the range of 1400–2500 MPa and a thickness of 3.4–12 μm were synthesized. An acceptable correlation between the hardness and thickness of the coating was revealed. It enables the assessment of coating thickness by measurements of hardness and can be used for non-destructive evaluation of coating thickness.

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