Wyniki wyszukiwania - BazTech

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Microplasma-sprayed multilayer coatings for electric heating elements

Kaliuzhnyi Sergii, Alontseva Dayra, Voinarovych Sergey, Kyslytsia Oleksandr, Khozhanov Aleksandr, Łatka Leszek, Faizrakhmanov Zulfat, Bektasova Gulsym

Materials Science Poland

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2022

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Vol. 40, No. 4

158--170

EN

The paper presents new results on the application of microplasma spraying (MPS) for manufacturing electric heating elements (EHEs) consisting of a St3 steel plate (the substrate) with a sprayed electrically insulating Al2O3 sublayer (400±50 μm thick) and TiO2 electric heating tracks (4 mm width; 150±50 μm thickness). Measurements of the temperature of the multilayer coating with a thermal imager enabled determination of the temperature distribution over the surface of the EHE. The electric strength and conductivity tests showed the efficiency of the sprayed EHEs up to a temperature of 200°C. The results of analysis of the causes of material losses during MPS of electric heating tracks (TiO2) are presented, and the optimal parameters for efficient MPS of coatings in the form of narrow tracks on steel substrates are determined. Using regression analyses, the equation for the influence of MPS parameters on the coating transfer efficiency (CTE) is obtained. Process parameters such as the electric current and the plasma-forming gas flow rate have been found to have the greatest influence on the CTE. In the experiment, a high efficiency of the sprayed material during MPS of electric heating tracks of TiO2 powder was established (the maximum CTE reached 89%), which indicates the prospects for using MPS technology in the production of EHEs for DC electric heating and for maintaining the temperature of product surfaces up to 200°C.

2

Microplasma spraying of hydroxyapatite coatings on additive manufacturing titanium implants with trabecular structures

Kadyroldina Albina, Alontseva Dayra, Voinarovych Sergey, Łatka Leszek, Kyslytsia Oleksandr, Azamatov Bagdat, Khozhanov Aleksandr, Prokhorenkova Nadezhda, Zhilkashinova Almira, Burburska Svitlana

Materials Science Poland

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2022

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Vol. 40, No. 4

28--42

EN

This paper presents new results of microplasma spraying (MPS) of laboratory-synthesized hydroxyapatite (HA) powder coatings onto trabecular substrates obtained by selective laser melting (SLM) of a certified titanium medical alloy powder. The aim of the study was to establish the possibility of combining the technologies of MPS and additive manufacturing (AM) for the possible production of custom-designed implants with increased surface biocompatibility, as well as to establish the MPS parameters that ensure chemical purity of the HA coating and satisfactory adhesion of the coatings to the substrate. The structural-phase compositions of the initial HA powder and the plasma-sprayed HA coating were studied by X-ray diffraction analysis and transmission electron microscopy, and the adhesion strength of the coating was tested according to the F1147 standard of the American Society for Testing and Materials (ASTM). The main results of the study are the following: the application of the MPS technology for HA coating with an average thickness of 150±50 μm on trabecular substrates obtained by the SLM method has been shown. The parameters of MPS of HA coatings onto titanium implants with a trabecular surface have been established. It is also proved that using the appropriate MPS parameters, it is possible to obtain a HA coating with a 95% level of HA phases, 93% level of crystallinity, and the adhesion strength to the trabecular substrate of 24.7±5.7 MPa, which complies with the requirements of the international medical standard (International Organization for Standardization [ISO] 13779-2:2018). These results are of significance for a wide range of researchers developing plasma spray technologies for the manufacture of biocompatible coatings.

3

The influence of plasma-sprayed coatings on surface properties and corrosion resistance of 316L stainless steel for possible implant application

Woźniak Anna, Staszuk Marcin, Reimann Łukasz, Bialas Oktawian, Brytan Zbigniew, Voinarovych Sergii, Kyslytsia Oleksandr, Kaliuzhnyi Sergii, Basiaga Marcin, Adamiak Marcin

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 4

223--243

EN

Herein, we analyzed the morphology of atmospheric plasma-sprayed (APS) coating on medical 316L stainless steel and its influence on the physical and electrochemical properties of implant application. Five types of coatings were examined: hydroxyapatite (HAp), titanium (Ti), zirconium (Zr), Ti/HAp and Zr/HAp. The base properties of the coatings were analyzed via chemical and phase composition, surface topography, surface wettability and in particular the corrosion resistance in Ringer solution in immersed conditions and potentiodynamic test, and EIS analysis. APS coating of pure HAp on 316L stainless steel showed poor cohesive bonding to the substrate material, whereas the application of Ti and Zr interlayer prior to HAp deposition improved surface morphology and coating properties. The beneficial effect of Ti and Zr interlayer under HAp layer on binding was demonstrated. HAp containing coatings (HAp, Ti/HAp and Zr/HAp) show Ca/P ratio greater than 1.8, which may positively influence the differentiation of osteogenic cells and good adhesion to bones. Among the studied materials, the composite coatings with Zr or Zr/HAp showed favorable physicochemical properties and the highest corrosion resistance in Ringer solution.

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Development of technologies for manufacturing medical implants using CNC machines and microplasma spraying of biocompatible coatings

Alontseva Dayra, Azamatov Bagdat, Voinarovych Sergii, Kyslytsia Oleksandr, Koltunowicz Tomasz N., Toxanbayeva Aigerim

Przegląd Elektrotechniczny

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2020

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R. 96, nr 4

154--157

EN

The paper describes the main technological approaches for manufacturing medical implants from titanium alloy using Computer Numerical Control (CNC) machines and microplasma spraying of hydroxyapatite (HA) coatings. New approaches to the formation of coatings with the desired structure and properties and the challenges of developing the technologies for producing modified implants are discussed.

PL

W artykule opisano główne podejścia technologiczne do wytwarzania implantów medycznych ze stopu tytanu przy użyciu maszyn CNC do sterowania numerycznego i mikroplazmowego natryskiwania powłok hydroksyapatytowych (HA). Omówiono nowe podejścia do tworzenia powłok o pożądanej strukturze i właściwościach oraz wyzwania związane z opracowaniem technologii wytwarzania zmodyfikowanych implantów.