TY - GEN A1 - Salhi, Faiza A1 - Aissani, Linda A1 - Fellah, Mamoun A1 - Chadli, Abdel Hakim A1 - Cheriet, Abderrahmane A1 - Belgroune, Ahlam A1 - Nouveau, Corinne A1 - Obrosov, Aleksei A1 - Samad, Mohammed Abdul A1 - Alhussein, Akram T1 - Experimental investigation of structural, wetting, mechanical and Tribological properties of TiZrN thin films deposited by magnetron sputtering T2 - Surfaces and Interfaces N2 - TiZrN thin films were deposited on Si (100) wafers and XC100 steel substrates by reactive R.f. magnetron sputtering using titanium and zirconium targets in an Ar-N2 mixture atmosphere to evaluate the effect of varying Zr content (0 to 22.2 at.%), on the film structure, surface wettability, hardness and wear resistance. The presence of different phases such as TiN, ZrN, and ZrO2 were confirmed by XRD analysis. Results showed that, the lattice parameter and film thickness increased while the crystallite size and average roughness decreased with increasing Zr content. Total surface energy between the film surface and testing liquids decreased with the addition of Zr. TiZrN film containing 18.3 at.% of Zr showed the lowest surface energy of 38.7 mN/m, indicating its hydrophobicity. The nanoindentation measurements, friction and wear tests showed that the TiZrN thin film containing 18.3 at.% of Zr had the best tribo-mechanical performance. The TiZrN (18.3 at.% Zr) film exhibited the lowest friction coefficient (0.31), and the lowest wear rate (6.65 × 10−5 mm3/Nm), which corresponds to the highest H/E ∼ 0.139, and H3/E2 ∼ 0.49 GPa ratios. The improvement in the tribo-mechanical properties is attributed to the solid solution strengthening due to the incorporation of Zr atoms in TiN system, which results in the highest hardness of 25 GPa for TiZrN (18.3 at.% Zr) film. KW - TiZrN film KW - Magnetron sputtering KW - Structure KW - Surface wettability KW - Mechanical properties KW - Wear resistance Y1 - 2021 UR - https://www.sciencedirect.com/science/article/abs/pii/S2468023021005964 U6 - https://doi.org/10.1016/j.surfin.2021.101519 SN - 2468-0230 VL - 27 ER - TY - GEN A1 - Obrosov, Aleksei A1 - Rylkov, Evgenii A1 - Morozova, Iuliia A1 - Naumov, Anton T1 - НАНЕСЕНИЕ ИЗНОСОСТОЙСКИХ ПОКРЫТИЙ НА ИНСТРУМЕНТЫ ДЛЯ СВАРКИ ТРЕНИЕМ С ПЕРЕМЕШИВАНИЕМ МЕТОДОМ МАГНЕТРОННОГО РАСПЫЛЕНИЯ T2 - International Scientific Conference Modern materials and advanced manufacturing technology (MMAMT-2021) KW - PVD KW - FSW tools KW - Welding Y1 - 2021 UR - http://smppt.spbstu.ru/ UR - http://nanoplatform.by/rss/1701-international-scientific-conference-modern-materials-and-advanced-manufacturing-technology-mmamt-2021.html SP - 169 EP - 170 ER - TY - GEN A1 - Belgroune, Ahlam A1 - Alhussein, Akram A1 - Aissani, Linda A1 - Zaabat, Mourad A1 - Obrosov, Aleksei A1 - Verdy, Christophe A1 - Langlade, Cécile T1 - Effect of He and N2 gas on the mechanical and tribological assessment of SS316L coating deposited by cold spraying process T2 - Journal of Materials Science N2 - In this study, simulation and experimental methods were used to investigate the influence of cold spray conditions on AISI 316L stainless steel coatings. The effect of both helium and nitrogen gases used was investigated. The temperature, particle sizes of spraying powder, and distance from the nozzle throat to the impinging point were estimated by using the Kinetics Spray Solutions GmbH software. The 316L stainless steel (SS) coatings were examined by X-ray diffraction, Scanning Electron Microscopy and Energy Dispersive X-Ray Microanalysis. The tribological behavior was evaluated under different loads (2 N and 5 N) in dry conditions. It was found that the nitrogen and helium propellant gas with high speed and fine particles led to produce good coatings with dense microstructures. From the nanoindentation experiments, the Young's modulus and hardness of the SS 316L samples were enhanced of about 8% with helium due to the high particle velocity. It was shown that the wear resistance of SS 316L produced with helium was higher than that of the standard SS 316L coatings. The coatings produced with helium revealed lower friction coefficient (0.65) and wear rate (6.9 × 10–4 mm3/Nm) under 2 N applied load than that obtained nitrogen. It was also found that the SS 316L cold sprayed by helium with dense structure presents high hardness and good tribological performance that can be suggested for several applications. Y1 - 2022 UR - https://link.springer.com/article/10.1007/s10853-022-06950-1#article-info U6 - https://doi.org/10.1007/s10853-022-06950-1 SN - 1573-4803 VL - 57 IS - 8 SP - 5258 EP - 5274 ER - TY - GEN A1 - Bouras, Dikra A1 - Fellah, Mamoun A1 - Mecif, Abla A1 - Barillé, Régis A1 - Obrosov, Aleksei A1 - Rasheed, Mohammed T1 - High photocatalytic capacity of porous ceramic-based powder doped with MgO T2 - Journal of the Korean Ceramic Society N2 - To purify water at low cost for our daily life, the effect of ceramic-based (mullite–cristobalite) and (mullite–zircon) powders doped with different amounts of magnesium oxide (MgO) (10 and 20 wt%) was studied. These compounds are made of a local raw material DD3 with addition of zirconia (ZrO2) to create an open porosity. The powders were prepared by the traditional mixing method with the help of an automated crushing. The effect of MgO doping on structural, morphological and photocatalytic properties of the material was studied by various analytical techniques such as X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, infrared, and UV–visible spectrometry. The results of XRD proved that there was a deformation in the crystal structure of the two types of ceramics after addition, which resulted in a shift of the spectra to the right, while SEM proved the presence of pores with a larger size as the proportion of MgO increases. The chemical composition of the basic components of the ceramic compounds as well as the additive was confirmed with EDS and IR spectra. The final results show that ceramics with added zirconia (DD3Z) and doped with 10% of MgO have a better photocatalytic efficiency than ceramics without zirconia. This important effect could be related to the higher rate of porosity, which provides a more active surface. The 10% MgO content showed a high photoactivity of 77.33% in only 15 min. The maximum hydrolysis rate obtained with Orange II was 92.95% after a period of 45 min with DD3Z/MgO powders. Y1 - 2023 UR - https://link.springer.com/article/10.1007/s43207-022-00254-5 U6 - https://doi.org/10.1007/s43207-022-00254-5 SN - 2234-0491 IS - 60 SP - 155 EP - 168 ER - TY - GEN A1 - Morozova, Iuliia A1 - Kehm, Christian A1 - Obrosov, Aleksei A1 - Yang, Yitong A1 - Miah, Kamal Uddin Mohammad A1 - Uludintceva, Elena A1 - Fritzsche, Sebastian A1 - Weiß, Sabine A1 - Michailov, Vesselin T1 - On the Heat Treatment of Selective-Laser-Melted 316L T2 - Journal of Materials Engineering and Performance N2 - The effect of heat treatment at various temperatures (650, 850, 1050, and 1100°C) and dwell times (10 min and 1 h) on the metallurgical and microstructural evolution as well as on the related tensile properties of stainless steel 316L processed by selective laser melting (SLM) has been systematically evaluated. The metallurgical and microstructural features such as defects, stability of the columnar–cellular structure and substructure, second phase particles, and phase transformation imparted by SLM and heat treatment have been discussed. It has been shown that the processing conditions specific to SLM significantly alter the kinetics of phase evolution compared to standard welding techniques which affects the accuracy of the prediction. The influence of these characteristics on tensile properties and hardness was elucidated. It was disclosed that with increasing heat treatment temperature there was a gradual increase in elongation but a decrease in strength related to the dislocation density and the development of the microstructure. KW - 316L KW - grain structure KW - phase evolution KW - SLM KW - tensile properties Y1 - 2023 U6 - https://doi.org/10.1007/s11665-022-07404-0 SN - 1544-1024 VL - 32 (2023) IS - 10 SP - 4295 EP - 4305 ER - TY - GEN A1 - Morozova, Iuliia A1 - Królicka, Aleksandra A1 - Obrosov, Aleksei A1 - Yang, Yitong A1 - Doynov, Nikolay A1 - Weiß, Sabine A1 - Michailov, Vesselin T1 - Precipitation phenomena in impulse friction stir welded 2024 aluminium alloy T2 - Materials Science and Engineering: A N2 - Microhardness variations across the friction stir welded (FSW) and impulse friction stir welded (IFSW) AA2024–T351 joints have been elucidated by the transformations of the S–Al2CuMg phase with a special focus on a distinguished hardness peak within the heat-affected zone (HAZ) of the impulse welds. The increase in hardness within the stir zone (SZ) originated from the partial re-precipitation of the initial Guinier-Preston-Bagaryatsky zones (GPB) and metastable S needles, previously dissolved.) Formation and growth of stable S precipitates via coalescence accounted for the softening through the thermo-mechanically affected zone (TMAZ). The peak strengthening within the HAZ of the IFSW joints was mainly caused by the dense needle-shaped S particles, which can be explained by a mutual influence of the process specific temperature and strain cycles. Dislocations and subgrain boundaries introduced to the material due to plastic deformation facilitated the nucleation of strengthening S precipitates in the HAZ. It demonstrates that the impact of deformation should be considered by the characterization of the precipitation development in the HAZ. KW - AA2024 KW - impulse friction stir welding KW - microhardness KW - s precipitation KW - thermal cycle KW - deformation Y1 - 2022 U6 - https://doi.org/10.1016/j.msea.2022.143617 SN - 0921-5093 SP - 1 EP - 11 ER - TY - GEN A1 - Figiel, Paweł A1 - Biedunkiewicz, Anna A1 - Jach, Katarzyna A1 - Obrosov, Aleksei A1 - Garbiec, Dariusz A1 - Bik, Maciej A1 - Sitarz, Maciej A1 - Kucia, Zofia A1 - Pawlyta, Mirosława A1 - Weiß, Sabine T1 - Ti-Mo-xTiC composites manufactured by U-FAST reactive sintering T2 - International Journal of Refractory Metals and Hard Materials N2 - The paper presents the characteristics of Ti-Mo-xTiC composites manufactured under experimentally selected conditions using the upgraded field-assisted sintering technique (U-FAST). Mixtures of microstructural titanium powders and nc-Ti0.9Mo0.1C/C carbide powders protected from oxidation by a carbon shell were subjected to sintering. The powders with nc-Ti0.9Mo0.1C/C contents of 10 and 20 wt% were used. The content of carbon forming the carbon shell was approximately 3 or 40 wt%. Composites with near full density were reinforced with titanium carbides in a Ti-Mo matrix. The composites with the highest content of reinforcing phase are characterized by the highest values of hardness, Young's modulus and wear resistance. Although the hardness of these composites is similar to that of ceramics, their nature is not brittle. Despite the high value of the Young's modulus, the addition of hard particles of the reinforcing phase to the titanium matrix significantly increases the values of the H/E ratio of the composites compared to the reference samples of cp-Ti and Ti6Al4V. A comparison of the research results for the composites with the highest share of titanium carbides showed that lowering the sintering temperature from 1300 to 1150 °C resulted in the inhibition of grain growth, a reduction in composite heterogeneity, composite roughness and hardness as well as a rise in the Young's modulus. An increase in the sintering temperature from 1150 to 1300 °C contributed to the higher high angle grain boundaries (HAGB) content. KW - TiMMCs KW - SPS KW - EBSD KW - Nanoindentation KW - Wear Y1 - 2022 UR - https://www.sciencedirect.com/science/article/pii/S0263436822001846#! U6 - https://doi.org/10.1016/j.ijrmhm.2022.105960 SN - 0263-4368 IS - 108 SP - 1 EP - 14 ER - TY - GEN A1 - Hezil, Naouel A1 - Aissani, Linda A1 - Fellah, Mamoun A1 - Samad, Mohammed Abdul A1 - Obrosov, Aleksei A1 - Chekalkin, Timofey A1 - Marchenko, Ekaterina T1 - Structural, and tribological properties of nanostructured α + β type titanium alloys for total hip T2 - Journal of Materials Research and Technology N2 - Titanium alloys are in demand for various biomedical applications and the most popular among them being, Ti–6Al–4V. Hence, in this study, Ti–6Al–7Nb are fabricated through the route of mechanical milling using different sintering temperatures. X-ray diffraction and hardness tests were conducted to characterize the developed sams to evaluate the effect of sintering temperatures on the structural and mechanical properties. It is observed that the sams sintered at a temperature of 1250 °C had the smallest crystallite and pore size, with enhanced relative density and mechanical properties. Tribological tests were conducted at varying normal loads to characterize the wear and frictional behaviour and showed that the sams sintered at 1250 °C presented the lowest friction coefficient and wear rate. KW - Ti–6Al–7Nb KW - Ti-alloys KW - Wear resistance KW - Sintering KW - Biomedical applications Y1 - 2022 UR - https://www.sciencedirect.com/science/article/pii/S2238785422009036#! U6 - https://doi.org/10.1016/j.jmrt.2022.06.042 SN - 2238-7854 IS - 19 SP - 3568 EP - 3578 ER - TY - GEN A1 - Petkov, Nikolay A1 - Bakalova, Totka A1 - Obrosov, Aleksei A1 - Kashkarov, Egor B. A1 - Kormunda, Martin A1 - Kejzlar, Pavel A1 - Bahchedzhiev, Hristo A1 - Dadourek, Karel A1 - Weiß, Sabine T1 - Structural, mechanical, and tribological properties of CrCN coatings obtained by cathodic arc physical vapour deposition technology at different CH4/N2 gas ratio T2 - Thin Solid Films N2 - Chromium carbonitride coatings were deposited by cathodic arc physical vapor deposition technology at a temperature of 300 °C, as were used the reactive gasses CH4 and N2. The structural analysis of the CrN coating showed a polycrystalline structure with mixed CrN and Cr2N phases. All studied coatings, including the CrC exhibits fcc structure. The phases were confirmed by X-ray photoelectron spectroscopy measurements where a surface oxidation was also detected. The increase of the CH4 gas flow during the deposition process leads to a parabolic trend with the highest hardness of 33.5 GPa for the coating deposited at CH4 / N2 = 0.53. At the same time the lowest coefficient of friction for both counterparts Al2O3 and ZrO2 (0.28 and 0.26, respectively) were measured at CH4 / N2 = 1.86. The tribological tests reveal that the wear of the coatings increases with an increasing CH4 flow rate, whereas the coefficient of friction decreases. This observed contradiction is explained by a phenomenon described as the effect of Rebinder. KW - Chromium carbonitride KW - Cathodic arc deposition KW - X-ray diffraction KW - X-ray photoelectron spectroscopy KW - Mechanical properties KW - Wear Y1 - 2023 UR - https://www.sciencedirect.com/science/article/pii/S0040609022005715 U6 - https://doi.org/10.1016/j.tsf.2022.139669 SN - 1879-2731 VL - 766 ER - TY - GEN A1 - Aissani, Linda A1 - Belgroune, Ahlam A1 - Saoudi, Abdenour A1 - Hmima, Abdelhamid A1 - Fellah, Mamoun A1 - Obrosov, Aleksei A1 - Alhussein, Akram T1 - Tribo-mechanical performance and antibacterial activity in (Cu, Zr)-alloyed Ti(Al)N coatings synthesized by reactive magnetron sputtering T2 - Journal of Materials Science N2 - In this work, copper and zirconium were added into the Ti(Al)N matrix to form deposited on TiAl(Cu, Zr)N coating using RF magnetron sputtering system in order to improve the mechanical, wear performance, and antibacterial activity. Results revealed that the TiAl(Cu, Zr)N coatings have a dense structure with (111) preferential orientation. The deposited TiAl(Cu, Zr)N coatings exhibited fcc-TiN structure, whereas the addition of Zr and Cu into the Ti(Al)N induced the appearance of Cu and ZrN. The solid solution strengthening and the increase in compressive residual stress (− 2.54 GPa) of Ti(Al, Zr)N coating with higher lattice strain (+ 0.1520) by the addition of Zr improved the hardness from 20.9 GPa. For the tribological property, the friction coefficient and wear rate decreased from (0.45, 5.9 × 10−3mm3/Nm) for the TiAlN to (0.29, 4.2 × 10−5mm3/Nm) for the Ti(Al, Zr)N, respectively, with high elasto-plastic H/E, H3/E2 (0.076, 0.121 GPa) ratios due to the low surface roughness, high adhesion, and nanocomposite structure. The results indicated the addition of Zr improves the friction property of Ti(Al)N coating. Although with their lower hardness than Ti(Al)N coating, the Ti(Al, Cu)N coating with 9.2 at.% Cu exhibited an excellent wear resistance and good antibacterial activity, which demonstrates its potential as a candidate material for biomedical application. Y1 - 2022 UR - https://link.springer.com/article/10.1007/s10853-022-07804-6 U6 - https://doi.org/https://doi.org/10.1007/s10853-022-07804-6 SN - 1573-4803 VL - 57 SP - 19612 EP - 19630 ER - TY - GEN A1 - Grudinin, V. A. A1 - Bleykher, G. A. A1 - Krivobokov, V. P. A1 - Semyonov, O. V. A1 - Obrosov, Aleksei A1 - Weiß, Sabine A1 - Sidelev, D. V. T1 - Hot target magnetron sputtering enhanced by RF-ICP source: Microstructure and functional properties of CrNx coatings T2 - Vacuum N2 - CrNx coatings were deposited at high rates (100–130 nm/min) using hot Cr target magnetron sputtering enhanced by a radio-frequency inductively coupled plasma (RF-ICP) source in an Ar + N2 atmosphere. Besides separation of inert and reactive atmosphere, the RF-ICP source can be an effective tool for ion assistance in case of coating growth and to tailor film parameters. The effects of nitrogen flow rate and substrate bias potential on microstructure and functional properties of the CrNx coatings were investigated. An increase in nitrogen flow rate favored the formation of a looser microstructure of the coatings, while substrate biasing had the opposite effect. The functional properties were strongly dependent on the phase composition of the CrNx coatings. The change in coating microstructure significantly affected hardness, elastic modulus, adhesion, friction coefficients and corrosion resistance. The results indicated that ion assistance can be a key feature for regulating functional properties in the considered type of coating deposition. Cr2N and CrN compound coatings with high hardness (∼20 GPa) and low corrosion current density (icorr ∼ 3–5·10−9 A/cm2) in a 3.5 wt% NaCl solution were obtained by high-rate deposition. KW - CrN KW - Coatings KW - Hot target KW - Magnetron sputtering KW - High-rate deposition KW - RF-ICP Y1 - 2022 UR - https://www.sciencedirect.com/science/article/pii/S0042207X2200152X U6 - https://doi.org/10.1016/j.vacuum.2022.111020 SN - 1879-2715 VL - 200 ER - TY - GEN A1 - Marchenko, Ekaterina A1 - Yasenchuk, Yuri A1 - Klopotov, Anatoliy A1 - Ustinov, Artem A1 - Abzaev, Yuri A1 - Vetrova, Anna A1 - Chekalkin, Timofey A1 - Obrosov, Aleksei T1 - Study of macroplastic flow in surface layers of porous SHS-TiNi by digital image correlation T2 - ISSS Journal of Micro and Smart Systems N2 - In this work, we studied the evolution and features of localized strain fields in porous SHS-TiNi samples. Using the Vic-3D optical system and spayed speckle patterns, a localized plastic flow on the surface of porous plates of 0.85 mm and 2.7 mm thick loaded up to fracture in a quasi-static mode was traced and characterized. As seen, a 0.85 mm thick specimen indicated two strain-hardening distinctive parts in the stress-strain curve. Moreover, regions of localized strain are found that be wider than that of a 2.7 mm thick sample. It can be argued that by combining speckle patterns and quasi-static tension, one can effectively explore and predict the deformation behavior of a designing bone substitute made of porous SHS-TiNi. KW - Localized plastic flow KW - Porous SHS-TiNi KW - Digital image correlation KW - Speckle patterns Y1 - 2022 U6 - https://doi.org/10.1007/s41683-022-00104-w SN - 2509-7997 VL - 11 IS - 2 SP - 343 EP - 347 ER - TY - GEN A1 - Boukhalfa, Chaima A1 - Hezil, Naouel A1 - Ouanes, Miyada A1 - Fellah, Mamoun A1 - Baccouche, Mostefa A1 - Obrosov, Aleksei A1 - Dahmani, Marwa ED - Fellah, Mamoun ED - Hezil, Naouel T1 - Structure-property correlation in a Nanostructured Ti-6Al-4V alloy designed for biomedical applications T2 - First National Conference on Materials Sciences and Engineering MSE-22 N2 - The use of powder metallurgy techniques for manufacturing near net shape components for the biomedical field is on a continuous development. Evaluating the effect of different process parameters such as milling time on the properties of these newly developed alloys leads to enhancing their properties, Hence, in this paper, the influence of structural parameters on the mechanical proprieties of a nanostructured Ti-6Al-4V alloy was investigated, considering the milling duration variation. Y1 - 2022 UR - https://www.researchgate.net/publication/365605294_Proceedings_of_First_National_Conference_On_Materials_Sciences_and_Engineering_MSE%2722 SN - 978-9931-9603-2-4 SP - 703 EP - 703 PB - Abbes Laghour University CY - Khenchela, Algeria ER - TY - GEN A1 - Boukhalfa, Chaima A1 - Hezil, Naouel A1 - Ouanes, Miyada A1 - Fellah, Mamoun A1 - Baccouche, Mostefa A1 - Obrosov, Aleksei A1 - Dahmani, Marwa ED - Fellah, Mamoun ED - Hezil, Naouel T1 - The effect of surface properties on the wear resistance of Ti-6Al-4V biomedical alloy manufactured via mechanical alloying T2 - First National Conference on Materials Sciences and Engineering MSE-22 N2 - The Ti-6Al-4V alloy is one of the common used titanium alloys in prosthetic applications, due to its significant proprieties, however, its wear performance is questionable, hence, the present study aims to evaluate the wear resistance of a Nanostructured Ti-6Al-4V alloy manufactured via high energy ball milling, with varying milling duration in order to investigate the correlation between surface proprieties and the wear performance of the alloy so as understanding its wear mechanisms. Y1 - 2022 UR - https://www.researchgate.net/publication/365605294_Proceedings_of_First_National_Conference_On_Materials_Sciences_and_Engineering_MSE%2722 SN - 978-9931-9603-2-4 SP - 543 EP - 543 PB - Abbes Laghour University CY - Khenchela, Algeria ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Hamadi, Fouzia A1 - Iqbal, Amjad A1 - Samad, Mohammed Abdul A1 - Alburaikan, Alhanouf A1 - Khalifa, Hamiden Abd El-Wahed A1 - Obrosov, Aleksei T1 - Effect of Fe content on physical, tribological and photocatalytical properties of Ti-6Al-xFe alloys for biomedical applications T2 - Tribology International N2 - The aim of the current study is to evaluate the effect of iron content (0, 2, 4, 6 and 10 wt%) on the structural, tribological and photocatalytical properties of a nanostructured ternary alloy Ti-6Al-XFe, prepared by high energy milling. The alloys’ characteristics such as lattice parameters, powder morphologies, surface roughness, relative density/porosity, and microhardness, were evaluated using X-ray diffraction (XRD), scanning electron microscope (SEM), surface profilometry, porosimeter and micro durometer, respectively. The W-H method was utilized to determine the crystallite size. Micro strain was also calculated, which is produced in the lattice due to the diffusion of iron atoms. The photocatalytical characterization was conducted by measuring their absorbance as a function of time using spectrophotometer of visible and ultraviolet light in the wavelength range of 500–800 nm. The tribological characterization was performed using an oscillating tribometer under wet conditions, simulating the human body environment using Phosphate Buffered Saline (PBS) solution with neutral pH 7.4, under different applied loads of 2, 6 and 10 N, respectively. Results showed that the addition of Fe has a significant effect on the structural properties of the developed alloys. The lattice parameter (aα) decreased with increasing Fe content from 2.9493 Å (0 wt% Fe) to 2.9491 Å (10 wt% Fe), while the average grain size increased considerably from 6.965 nm (0 wt% Fe) to 44.42 nm (10 wt% Fe). The wear test results showed that, friction coefficient and wear rate considerably decreased due to the formation of protective films such as TiO2. The photocatalytical characterization showed that, the degradation of methylene blue (MB) increased with increasing Fe content. The Ti-6Al-4Fe -catalyst gave the best degree of degradation of 90.76% within 60 min, which meant that the decolorization process could be operated rapidly at a relatively low cost without UV irradiation. KW - Ti-Al-Fe alloys KW - Biomaterials KW - Tribology KW - Biomedical applications KW - Total hip prosthesis KW - Nanoparticle Y1 - 2024 UR - https://www.sciencedirect.com/science/article/pii/S0301679X23009362 U6 - https://doi.org/10.1016/j.triboint.2023.109146 SN - 1879-2464 VL - 191 ER - TY - GEN A1 - Alontseva, Darya A1 - Safarova (Yantsen), Yuliya A1 - Voinarovych, Sergii A1 - Obrosov, Aleksei A1 - Yamanoglu, Ridvan A1 - Khoshnaw, Fuad A1 - Yavuz, Hasan Ismail A1 - Nessipbekova, Assem A1 - Syzdykova, Aizhan A1 - Azamatov, Bagdat A1 - Khozhanov, Alexandr A1 - Weiß, Sabine T1 - Biocompatibility and Corrosion of Microplasma-Sprayed Titanium and Tantalum Coatings versus Titanium Alloy T2 - Coatings N2 - This study investigates the in vitro biocompatibility, corrosion resistance, and adhesion strength of a gas abrasive-treated Ti6Al4V alloy, alongside microplasma-sprayed titanium and tantalum coatings. Employing a novel approach in selecting microplasma spray parameters, this study successfully engineers coatings with tailored porosity, roughness, and over 20% porosity with pore sizes up to 200 μm, aiming to enhance bone in-growth and implant integration. This study introduces an innovative methodology for quantifying surface roughness using laser electron microscopy and scanning electron microscopy, facilitating detailed morphological analysis of both the substrate and coatings. Extensive evaluations, including tests for in vitro biocompatibility, corrosion resistance, and adhesive strength, revealed that all three materials are biocompatible, with tantalum coatings exhibiting superior cell proliferation and osteogenic differentiation, as well as the highest corrosion resistance. Titanium coatings followed closely, demonstrating favorable osteogenic properties and enhanced roughness, which is crucial for cell behavior and attachment. These coatings also displayed superior tensile adhesive strengths (27.6 ± 0.9 MPa for Ti and 28.0 ± 4.9 MPa for Ta), surpassing the ISO 13179-1 standard and indicating a robust bond with the substrate. Our findings offer significant advancements in biomaterials for medical implants, introducing microplasma spraying as a versatile tool for customizing implant coatings, particularly emphasizing the superior performance of tantalum coatings in terms of biocompatibility, osteogenic potential, and corrosion resistance. This suggests that tantalum coatings are a promising alternative for enhancing the performance of metal implants, especially in applications demanding high biocompatibility and corrosion resistance. KW - biocompatible coatings KW - in vitro test KW - corrosion resistance KW - microplasma spraying (MPS) KW - medical implants KW - coating techniques Y1 - 2024 UR - https://www.mdpi.com/2079-6412/14/2/206 U6 - https://doi.org/10.3390/coatings14020206 SN - 2079-6412 VL - 14 IS - 2 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Bouras, Dikra A1 - Bouchareb, Nabila A1 - Larios, Alejandro Perez A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. A1 - Weiß, Sabine T1 - Investigating the effect of Zr content on electrochemical and tribological properties of newly developed near β-type Ti-alloys (Ti–25Nb-xZr) for biomedical applications T2 - Journal of Science: Advanced Materials and Devices N2 - In order to create alloys with exceptional properties for orthopedic uses, this study focuses on the impact of zirconium (Zr) content on the structural, electrochemical, and tribological qualities of nanostructured Ti–25Nb-xZr [x = 5, 10, 15, 20, 25, and 30 atomic (at.) %] alloys. The structural evolution was investigated using XRD and SEM techniques. The mechanical characteristics of the produced alloys, including Vickers hardness and Young's modulus, were measured. In addition, the corrosion tests were performed using the OCP, EIS, and PD methods in Ringer's solution within the independent pH range at 37 °C. A ball-on-disc tribometer was used to investigate the tribological behavior of the alloys under various loads and wet conditions using the Ringer solution. It has been verified that Zr content (at. %) in the alloys had an impact on their morphologies, structural evolution, and mechanical characteristics. According to the morphological analysis, the particle and crystallite size decreases with increasing Zr content. Young's modulus and Vickers hardness show the same tendency. The EIS data demonstrated that a single passive film formed on the alloy surfaces, and the addition of Zr enhanced the corrosion resistance of the passive films. The polarization curves demonstrate that the alloys had low corrosion current densities and large passive areas without the passive films disintegrating. Likewise, the inclusion of Zr resulted in a reduction in the corrosion and passive current densities values. All of these results suggested that the titanium alloys exhibit a more noble electrochemical activity caused by Zr. From the tribological perspective, it was found that the friction coefficient of the alloys reduced with increasing Zr content. KW - Ti-Nb-Zr alloys KW - Nanobiomaterials KW - Tribological behavior KW - Corrosion KW - Ringer's solution KW - Biomedical applications Y1 - 2024 UR - https://www.sciencedirect.com/science/article/pii/S2468217924000261 U6 - https://doi.org/10.1016/j.jsamd.2024.100695 SN - 2468-2179 ER - TY - GEN A1 - Fellah, Mamoun A1 - Bouchareb, Nabila A1 - Hezil, Naouel A1 - Merah, Neçar A1 - Alashkar, Yasser A1 - Imran, Mohd A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Electrochemical analysis of mechanically alloyed Ti50%-Ni50% alloy for bone implants use T2 - Journal of Alloys and Compounds N2 - The corrosion resistance of an implant material is an essential element of its biocompatibility. This research focuses on studying the effect of grinding/milling time on the corrosion behavior of the mechanically alloyed Ti50 %-Ni50 % (at%) alloy, for bone implant use, at varying milling times of 2, 6, 12, and 18 h. The powder particles' size, shape, and homogeneous chemical content were examined employing scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The alloyed particles' structural characteristics were determined by X-ray diffraction (XRD). Moreover, the characterization of the electrochemical properties was performed utilizing open-circuit potential (OCP) measurement, the Potentiodynamic Polarization (PD), and the Electrochemical Impedance Spectroscopy (EIS) technique. Electrochemical tests were conducted in physiological mediums simulating the human body: Hank's solution. The results revealed that; as the grinding time increased the crystallite size reduced from 57 nm to 29 nm, whereas the lattice parameters increased slightly from 3.18 to 3.22 Å, while the microstrain increased from 0.32 % to 0.99 %. Moreover, the hardness and Young's Modulus increased by about 70 and 16 %, respectively with milling period going from 2 to 18 h. The findings of the electrochemical test demonstrated that as milling progressed, corrosion resistance increased. The evolution of OCP curves as a function of the duration of immersions indicated that OCP increased with the duration of immersion up to 2500 s; this is due to a stable passive layer that has formed on the samples' surface. The results of potentiodynamic polarization curves revealed that both corrosion current density (icorr) and corrosion rate (CR) decreased reaching a value of 3.6945E-07 A/cm2 and 0.0074722 mm/year, respectively, at longer milling time (18 h). While, corrosion potential (Ecorr) increased from −0.51255 V/SCE to −0.29997 V/SCE with increasing grinding time. Additionally, the EIS data indicated that the resistance of the passive film increased with increasing milling times. The samples of Ti50-Ni50 produced at longer milling time exhibited excellent corrosion resistance due to the formation of a stable passive film which makes them useful for bone implants. KW - Ti-Ni alloys KW - Biomaterials KW - Mechanical alloying KW - Nanomaterial KW - Corrosion behavior KW - Electrochemical impedance spectroscopy Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1016/j.jallcom.2024.178046 SN - 1873-4669 IS - 1010 SP - 1 EP - 13 ER - TY - GEN A1 - Alontseva, Darya A1 - Safarova (Yantsen), Yuliya A1 - Voinarovych, Sergii A1 - Obrosov, Aleksei A1 - Yamanoglu, Ridvan A1 - Khoshnaw, Fuad A1 - Nessipbekova, Assem A1 - Syzdykova, Aizhan A1 - Yavuz, Hasan Ismail A1 - Kaliuzhnyi, Sergii A1 - Krasavin, Alexander A1 - Azamatov, Bagdat A1 - Khozhanov, Alexandr A1 - Olzhayev, Farkhad A1 - Weiß, Sabine T1 - Microplasma-Sprayed Titanium and Hydroxyapatite Coatings on Ti6Al4V Alloy: in vitro Biocompatibility and Corrosion Resistance: Part I T2 - Johnson Matthey Technology Review N2 - This two-part paper investigates the bioactivity and mechanical properties of coatings applied to Ti6Al4V, a common titanium alloy used in endoprosthetic implants. Coatings made from hydroxyapatite (HA) powder and commercially pure titanium (CP-Ti) wires were applied using microplasma spraying. The study focuses on the responses of rat mesenchymal stem cells (MSCs), which are essential for bone healing, to these coatings. Part I shows how adjusting the microplasma spraying process allows coatings with varying porosity and surface roughness to be achieved. KW - Endoprosthesis implants KW - Biocompatible coatings KW - Porosity KW - Surface roughness KW - In vitro test KW - Elastic modulus Y1 - 2025 UR - https://technology.matthey.com/content/journals/10.1595/205651325X17201903387613 U6 - https://doi.org/10.1595/205651325X17201903387613 VL - 69 IS - 1 SP - 45 EP - 58 ER - TY - GEN A1 - Alontseva, Darya A1 - Safarova (Yantsen), Yuliya A1 - Voinarovych, Sergii A1 - Obrosov, Aleksei A1 - Yamanoglu, Ridvan A1 - Khoshnaw, Fuad A1 - Nessipbekova, Assem A1 - Syzdykova, Aizhan A1 - Yavuz, Hasan Ismail A1 - Kaliuzhnyi, Sergii A1 - Krasavin, Alexander A1 - Azamatov, Bagdat A1 - Khozhanov, Alexandr A1 - Olzhayev, Farkhad A1 - Weiß, Sabine T1 - Microplasma-sprayed titanium and hydroxyapatite coatings on Ti6Al4V alloy: in vitro biocompatibility and corrosion resistance : part II coatings enhance cell proliferation, corrosion resistance and implant integration T2 - Johnson Matthey Technology Review N2 - Part II presents the results which show that HA coatings significantly enhance MSC proliferation by 13% compared to the titanium alloy base, while titanium coatings also exhibit an 11% increase. Porosity inversely affects CP-Ti’s elasticity. Coatings with lower porosity demonstrate better corrosion resistance. HA coatings promote osteogenic activity and angiogenesis, which is crucial for implant integration. KW - Endoprosthesis implants KW - Biocompatible coatings KW - Porosity KW - Surface roughness KW - In vitro test KW - Elastic modulus Y1 - 2025 U6 - https://doi.org/10.1595/205651325X17290035905758 SN - 2056-5135 VL - 69 (2025) IS - 1 SP - 59 EP - 75 ER - TY - GEN A1 - Rim, Imen A1 - Hezil, Naouel A1 - Fellah, Mamoun A1 - Saoudi, Adel A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. T1 - Enhancing kaolin performance through organic molecule modification and assessing its efficiency for lead and copper adsorption T2 - Environmental Technology & Innovation N2 - The research aimed to enhance the efficacy of kaolin in water treatment by incorporating diphenylamine (DPA) and to evaluate its effectiveness in adsorbing lead and copper in wastewater in comparison to natural kaolin (Nat-kaolin). This entailed modifying kaolin with DPA to create DPA-kaolin and conducting comprehensive characterization utilizing a range of techniques, including X-ray diffraction analysis (XRD), scanning electron microscope (SEM), energy dispersion X-ray (EDX), thermogravimetric analysis (TGA), differential thermal analysis (DTA), Fourier-transform infrared spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET) analysis. The results demonstrated the successful modification of DPA, as evidenced by an increase in BET-specific surface area of about 25 % (from 66.69 m².g−1 to 71.35 m².g−1), indicating enhanced adsorption capacity. XRD analysis confirmed the composition of the samples, while TGA/DTA indicated changes in water adsorption and dehydroxylation. SEM and EDX illustrated the tubular nature of the clay with a decrease in the amount of Al, about 10.76 %, and the amount of Si, about 10.38 %, on the DPA-kaolin. Notably, the FTIR spectrum of DPA-kaolin showed the presence of new vibration bands at 1248 cm−1, indicating the presence of DPA. In terms of adsorption, the DPA-kaolin exhibited significantly higher maximum adsorption capacities for Pb(II) and Cu(II) compared to the nat-kaolin, with values of 151 µmol/g and 134 µmol/g, respectively.These values were significantly higher than those observed for Nat-kaolin, which demonstrated adsorption capacities of 103 µmol/g for Pb(II) and 91 µmol/g for Cu(II). The adsorption kinetics indicated that the pseudo-second-order kinetic model described the sorption mechanism for both Pb(II) and Cu(II). This was evidenced by the values of R², which were 0.999 and 0.996, respectively. The study provides clear evidence that DPA-kaolin is more effective than Nat-kaolin in removing lead (Pb(II)) and copper (Cu(II)) from wastewater. Through rigorous experimentation, it was observed that DPA-kaolin exhibited notably enhanced adsorption capabilities for both Pb(II) and Cu(II) compared to Nat-kaolin. These findings serve to emphasize the practical importance and potential utility of the modification, offering promising prospects for the development of more efficient wastewater treatment methodologies. KW - Kaolin clay KW - Water treatment KW - DPA-Kaolin KW - Chemical treatment KW - Adsorption KW - Isotherms Y1 - 2024 U6 - https://doi.org/10.1016/j.eti.2024.103904 SN - 2352-1864 VL - 36 IS - November 22024 SP - 1 EP - 19 ER - TY - GEN A1 - Bouras, Dikra A1 - Fellah, Mamoun A1 - Barille, Regis A1 - Obrosov, Aleksei A1 - Ikbal, Amjad A1 - Avramov, Pavel V. A1 - El-Hiti, Gamal A. T1 - Multiple layers, porous surface, and their role in increasing the efficiency of photocatalytic coating on (DD3, DD3+ZrO2) ceramics and glass T2 - Ceramics International N2 - Magnesium-doped zinc oxide thin films were dip-coated onto porous ceramic and glass substrates under identical conditions (50 layers, same doping ratio). Structural, morphological, and photocatalytic properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), UV–visible spectrophotometry, and confocal microscopy. XRD analysis indicated a shift in peak positions towards higher angles, increased grain size, and lattice distortion on both substrates. Unique flower-shaped crystalline granulates were observed exclusively on the ceramic substrate (DD3Z). The energy gap decreased on the ceramic and increased on the glass substrate. The photocatalytic activity was evaluated using an aqueous orange II solution, showing significantly higher decomposition (80 ± 0.53 % after 6 h) on the ceramic compared to the glass substrate (30 %). The enhanced performance on ceramic substrates, particularly with DD3+ZrO2, was attributed to increased microporosity, surface roughness, and active material incorporation, facilitating greater photocatalytic efficiency. The findings suggest promising applications of these materials for efficient and cost-effective photocatalysis, with potential for reuse after thermal treatment at 500 °C. KW - Magnesium oxide KW - Magnesium-doped zinc oxide/DD3+zirconium oxide KW - Magnesium-doped zinc oxide/glass KW - Degradation capacity KW - Nanotechnology KW - Nanocomposites Y1 - 2024 U6 - https://doi.org/https://doi.org/10.1016/j.ceramint.2024.08.239 SN - 1873-3956 VL - 50 IS - 21, C SP - 43854 EP - 43873 ER -