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Smyrnova K, Sahul M, Haršáni M, Beresnev V, Truchlý M, Čaplovič L, Čaplovičová M, Kusý M, Kozak A, Flock D, Kassymbaev A, Pogrebnjak A. Composite Materials with Nanoscale Multilayer Architecture Based on Cathodic-Arc Evaporated WN/NbN Coatings. ACS Omega 2024; 9:17247-17265. [PMID: 38645329 PMCID: PMC11024943 DOI: 10.1021/acsomega.3c10242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 02/25/2024] [Accepted: 03/08/2024] [Indexed: 04/23/2024]
Abstract
Hard nitride coatings are commonly employed to protect components subjected to friction, whereby such coatings should possess excellent tribomechanical properties in order to endure high stresses and temperatures. In this study, WN/NbN coatings are synthesized by using the cathodic-arc evaporation (CA-PVD) technique at various negative bias voltages in the 50-200 V range. The phase composition, microstructural features, and tribomechanical properties of the multilayers are comprehensively studied. Fabricated coatings have a complex structure of three nanocrystalline phases: β-W2N, δ-NbN, and ε-NbN. They demonstrate a tendency for (111)-oriented grains to overgrow (200)-oriented grains with increasing coating thickness. All of the data show that a decrease in the fraction of ε-NbN phase and formation of the (111)-textured grains positively impact mechanical properties and wear behavior. Investigation of the room-temperature tribological properties reveals that with an increase in bias voltage from -50 to -200 V, the wear mechanisms change as follows: oxidative → fatigue and oxidative → adhesive and oxidative. Furthermore, WN/NbN coatings demonstrate a high hardness of 33.6-36.6 GPa and a low specific wear rate of (1.9-4.1) × 10-6 mm3/Nm. These results indicate that synthesized multilayers hold promise for tribological applications as wear-resistant coatings.
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Affiliation(s)
- Kateryna Smyrnova
- Institute
of Materials Science, Slovak University of Technology in Bratislava, J. Bottu St. 25, 917 24 Trnava, Slovak Republic
- Biomedical
Research Centre, Sumy State University, Rymskogo-Korsakova St. 2, 40007 Sumy, Ukraine
| | - Martin Sahul
- Institute
of Materials Science, Slovak University of Technology in Bratislava, J. Bottu St. 25, 917 24 Trnava, Slovak Republic
| | - Marián Haršáni
- Research
and Development Department, Staton, s.r.o., Sadová 1148, 038 53 Turany, Slovak
Republic
| | - Vyacheslav Beresnev
- Department
of Reactor Engineering Materials and Physical Technologies, V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022 Kharkiv, Ukraine
| | - Martin Truchlý
- Department
of Experimental Physics, Comenius University
in Bratislava, Mlynská
dolina F2, 842 48 Bratislava, Slovak Republic
| | - L’ubomír Čaplovič
- Institute
of Materials Science, Slovak University of Technology in Bratislava, J. Bottu St. 25, 917 24 Trnava, Slovak Republic
| | - Mária Čaplovičová
- Centre
for
Nanodiagnostics of Materials, Slovak University
of Technology in Bratislava, Vazovova 5, 812 43 Bratislava, Slovak Republic
| | - Martin Kusý
- Institute
of Materials Science, Slovak University of Technology in Bratislava, J. Bottu St. 25, 917 24 Trnava, Slovak Republic
| | - Andrii Kozak
- Institute
of Electrical Engineering, Slovak Academy of Sciences, Dúbravská Cesta 9, 841 04 Bratislava, Slovak Republic
| | - Dominik Flock
- Institute
of Materials Science and Engineering, Ilmenau University of Technology, Gustav-Kirchhoff Str. 1, 98693 Ilmenau, Germany
| | - Alexey Kassymbaev
- Center
of Advanced Development “VERITAS”, D. Serikbayev East Kazakhstan State Technical University, Protozanova St. 69, 070004 Ust-Kamenogorsk, Kazakhstan
| | - Alexander Pogrebnjak
- Institute
of Materials Science, Slovak University of Technology in Bratislava, J. Bottu St. 25, 917 24 Trnava, Slovak Republic
- Biomedical
Research Centre, Sumy State University, Rymskogo-Korsakova St. 2, 40007 Sumy, Ukraine
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Kuracina R, Szabová Z, Kosár L, Sahul M. Study into influence of different types of igniters on the explosion parameters of dispersed nitrocellulose powder. J Loss Prev Process Ind 2023. [DOI: 10.1016/j.jlp.2023.105017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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3
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Diedkova K, Pogrebnjak AD, Kyrylenko S, Smyrnova K, Buranich VV, Horodek P, Zukowski P, Koltunowicz TN, Galaszkiewicz P, Makashina K, Bondariev V, Sahul M, Čaplovičová M, Husak Y, Simka W, Korniienko V, Stolarczyk A, Blacha-Grzechnik A, Balitskyi V, Zahorodna V, Baginskiy I, Riekstina U, Gogotsi O, Gogotsi Y, Pogorielov M. Polycaprolactone-MXene Nanofibrous Scaffolds for Tissue Engineering. ACS Appl Mater Interfaces 2023. [PMID: 36892008 DOI: 10.1021/acsami.2c22780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
New conductive materials for tissue engineering are needed for the development of regenerative strategies for nervous, muscular, and heart tissues. Polycaprolactone (PCL) is used to obtain biocompatible and biodegradable nanofiber scaffolds by electrospinning. MXenes, a large class of biocompatible 2D nanomaterials, can make polymer scaffolds conductive and hydrophilic. However, an understanding of how their physical properties affect potential biomedical applications is still lacking. We immobilized Ti3C2Tx MXene in several layers on the electrospun PCL membranes and used positron annihilation analysis combined with other techniques to elucidate the defect structure and porosity of nanofiber scaffolds. The polymer base was characterized by the presence of nanopores. The MXene surface layers had abundant vacancies at temperatures of 305-355 K, and a voltage resonance at 8 × 104 Hz with the relaxation time of 6.5 × 106 s was found in the 20-355 K temperature interval. The appearance of a long-lived component of the positron lifetime was observed, which was dependent on the annealing temperature. The study of conductivity of the composite scaffolds in a wide temperature range, including its inductive and capacity components, showed the possibility of the use of MXene-coated PCL membranes as conductive biomaterials. The electronic structure of MXene and the defects formed in its layers were correlated with the biological properties of the scaffolds in vitro and in bacterial adhesion tests. Double and triple MXene coatings formed an appropriate environment for cell attachment and proliferation with mild antibacterial effects. A combination of structural, chemical, electrical, and biological properties of the PCL-MXene composite demonstrated its advantage over the existing conductive scaffolds for tissue engineering.
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Affiliation(s)
- Kateryna Diedkova
- Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine
- University of Latvia, 3 Jelgavas Street, Riga LV-1004, Latvia
| | - Alexander D Pogrebnjak
- Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine
- Department of Motor Vehicles, Lublin University of Technology, Nadbystrzycka 38 A, Lublin 20-618, Poland
- Al-Farabi Kazakh National University, 71 Al-Farabi Avenue, Almaty 050040, Kazakhstan
| | - Sergiy Kyrylenko
- Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine
| | - Kateryna Smyrnova
- Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine
- Institute of Materials Science, Faculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, Trnava 917 24, Slovakia
| | | | - Pawel Horodek
- Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences, 152 Radzikowskiego Street, Krakow 31-342, Poland
| | - Pawel Zukowski
- Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 38 D Nadbystrzycka Street, Lublin 20-618, Poland
| | - Tomasz N Koltunowicz
- Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 38 D Nadbystrzycka Street, Lublin 20-618, Poland
| | - Piotr Galaszkiewicz
- Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 38 D Nadbystrzycka Street, Lublin 20-618, Poland
| | - Kristina Makashina
- East-Kazakhstan State Technical University, D. Serikbayev Street, 19, Ust-Kamenogorsk 070000, Kazakhstan
| | - Vitaly Bondariev
- Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 38 D Nadbystrzycka Street, Lublin 20-618, Poland
| | - Martin Sahul
- Institute of Materials Science, Faculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, Trnava 917 24, Slovakia
| | - Maria Čaplovičová
- Centre for Nanodiagnostics of Materials, Slovak University of Technology in Bratislava, 5 Vazovova Street, Bratislava 812 43, Slovakia
| | - Yevheniia Husak
- Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine
- Faculty of Chemistry, Silesian University of Technology, 9 Strzody Street, Gliwice 44-100, Poland
| | - Wojciech Simka
- Faculty of Chemistry, Silesian University of Technology, 9 Strzody Street, Gliwice 44-100, Poland
| | - Viktoriia Korniienko
- Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine
- University of Latvia, 3 Jelgavas Street, Riga LV-1004, Latvia
| | - Agnieszka Stolarczyk
- Faculty of Chemistry, Silesian University of Technology, 9 Strzody Street, Gliwice 44-100, Poland
| | - Agata Blacha-Grzechnik
- Faculty of Chemistry, Silesian University of Technology, 9 Strzody Street, Gliwice 44-100, Poland
| | - Vitalii Balitskyi
- Materials Research Centre, 3 Krzhizhanovskogo Street, Kyiv 03142, Ukraine
| | - Veronika Zahorodna
- Materials Research Centre, 3 Krzhizhanovskogo Street, Kyiv 03142, Ukraine
| | - Ivan Baginskiy
- Materials Research Centre, 3 Krzhizhanovskogo Street, Kyiv 03142, Ukraine
| | - Una Riekstina
- University of Latvia, 3 Jelgavas Street, Riga LV-1004, Latvia
| | - Oleksiy Gogotsi
- Materials Research Centre, 3 Krzhizhanovskogo Street, Kyiv 03142, Ukraine
| | - Yury Gogotsi
- Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine
- A. J. Drexel Nanomaterials Institute, and Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Maksym Pogorielov
- Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine
- University of Latvia, 3 Jelgavas Street, Riga LV-1004, Latvia
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Šulhánek P, Ďuriška L, Palcut M, Babincová P, Sahul M, Čaplovič Ľ, Kusý M, Orovčík Ľ, Nagy Š, Satrapinskyy L, Haršáni M, Černičková I. Influence of Isothermal Annealing on Microstructure, Morphology and Oxidation Behavior of AlTiSiN/TiSiN Nanocomposite Coatings. Nanomaterials (Basel) 2023; 13:474. [PMID: 36770435 PMCID: PMC9921304 DOI: 10.3390/nano13030474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 01/18/2023] [Accepted: 01/20/2023] [Indexed: 06/18/2023]
Abstract
The present work investigates the influence of isothermal annealing on the microstructure and oxidation behavior of nanocomposite coatings. AlTiSiN/TiSiN coatings with TiSiN adhesive layer were deposited onto a high-speed steel substrate via physical vapor deposition. The coatings were investigated in the as-deposited state as well as after annealing in air at 700, 800, 900 and 1000 °C, respectively. The microstructure and morphology of the coatings were observed using scanning electron microscopy and transmission electron microscopy. The chemical composition and presence of oxidation products were studied by energy-dispersive X-ray spectroscopy. The phase identification was performed by means of X-ray diffraction. In the microstructure of the as-deposited coating, the (Ti1-xAlx)N particles were embedded in an amorphous Si3N4 matrix. TiO2 and SiO2 were found at all annealing temperatures, and Al2O3 was additionally identified at 1000 °C. It was found that, with increasing annealing temperature, the thickness of the oxide layer increased, and its morphology and chemical composition changed. At 700 and 800 °C, a Ti-Si-rich surface oxide layer was formed. At 900 and 1000 °C, an oxidized part of the coating was observed in addition to the surface oxide layer. Compared to the as-deposited sample, the oxidized samples exhibited considerably worse mechanical properties.
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Affiliation(s)
- Patrik Šulhánek
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia
| | - Libor Ďuriška
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia
| | - Marián Palcut
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia
| | - Paulína Babincová
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia
| | - Martin Sahul
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia
| | - Ľubomír Čaplovič
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia
| | - Martin Kusý
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia
| | - Ľubomír Orovčík
- Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 13 Bratislava, Slovakia
| | - Štefan Nagy
- Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 13 Bratislava, Slovakia
| | - Leonid Satrapinskyy
- Department of Experimental Physics, Comenius University in Bratislava, Mlynská dolina F2, 842 48 Bratislava, Slovakia
| | | | - Ivona Černičková
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia
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Kolesnyk V, Peterka J, Alekseev O, Neshta A, Xu J, Lysenko B, Sahul M, Martinovič J, Hrbal J. Application of ANN for Analysis of Hole Accuracy and Drilling Temperature When Drilling CFRP/Ti Alloy Stacks. Materials 2022; 15:ma15051940. [PMID: 35269169 PMCID: PMC8911582 DOI: 10.3390/ma15051940] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 03/02/2022] [Accepted: 03/03/2022] [Indexed: 02/01/2023]
Abstract
Drilling of Carbon Fiber-Reinforced Plastic/Titanium alloy (CFRP/Ti) stacks represents one of the most widely used machining methods for making holes to fasten assemblies in civil aircraft. However, poor machinability of CFRP/Ti stacks in combination with the inhomogeneous behavior of CFRP and Ti alloy face manufacturing and scientific community with a problem of defining significant factors and conditions for ensuring hole quality in the CFRP/Ti alloy stacks. Herein, we investigate the effects of drilling parameters on drilling temperature and hole quality in CFRP/Ti alloy stacks by applying an artificial neuron network (ANN). We varied cutting speed, feed rate, and time delay factors according to the factorial design L9 Taguchi orthogonal array and measured the drilling temperature, hole diameter, and out of roundness by using a thermocouple and coordinate measuring machine methods for ANN analysis. The results show that the drilling temperature was sensitive to the effect of stack material layer, cutting speed, and time delay factors. The hole diameter was mainly affected by feed, stack material layer, and time delay, while out of roundness was influenced by the time delay, stack material layer, and cutting speed. Overall, ANN can be used for the identification of the drilling parameters–hole quality relationship.
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Affiliation(s)
- Vitalii Kolesnyk
- Department of Manufacturing Engineering, Machines and Tools, Sumy State University, Rymskogo-Korsakova Str., 2, 40007 Sumy, Ukraine; (V.K.); (O.A.); (A.N.); (B.L.)
| | - Jozef Peterka
- Faculty of Materials Science and Technology, Slovak University of Technology in Bratislava, Ulica Jána Bottu č. 2781/25, 917-23 Trnava, Slovakia; (M.S.); (J.M.); (J.H.)
- Correspondence: ; Tel.: +42-19-0593-0245
| | - Oleksandr Alekseev
- Department of Manufacturing Engineering, Machines and Tools, Sumy State University, Rymskogo-Korsakova Str., 2, 40007 Sumy, Ukraine; (V.K.); (O.A.); (A.N.); (B.L.)
| | - Anna Neshta
- Department of Manufacturing Engineering, Machines and Tools, Sumy State University, Rymskogo-Korsakova Str., 2, 40007 Sumy, Ukraine; (V.K.); (O.A.); (A.N.); (B.L.)
| | - Jinyang Xu
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
| | - Bohdan Lysenko
- Department of Manufacturing Engineering, Machines and Tools, Sumy State University, Rymskogo-Korsakova Str., 2, 40007 Sumy, Ukraine; (V.K.); (O.A.); (A.N.); (B.L.)
| | - Martin Sahul
- Faculty of Materials Science and Technology, Slovak University of Technology in Bratislava, Ulica Jána Bottu č. 2781/25, 917-23 Trnava, Slovakia; (M.S.); (J.M.); (J.H.)
| | - Jozef Martinovič
- Faculty of Materials Science and Technology, Slovak University of Technology in Bratislava, Ulica Jána Bottu č. 2781/25, 917-23 Trnava, Slovakia; (M.S.); (J.M.); (J.H.)
| | - Jakub Hrbal
- Faculty of Materials Science and Technology, Slovak University of Technology in Bratislava, Ulica Jána Bottu č. 2781/25, 917-23 Trnava, Slovakia; (M.S.); (J.M.); (J.H.)
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Šugár P, Ludrovcová B, Kalbáčová MH, Šugárová J, Sahul M, Kováčik J. Laser Surface Modification of Powder Metallurgy-Processed Ti-Graphite Composite Which Can Enhance Cells' Osteo-Differentiation. Materials (Basel) 2021; 14:ma14206067. [PMID: 34683656 PMCID: PMC8537964 DOI: 10.3390/ma14206067] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 09/14/2021] [Accepted: 10/11/2021] [Indexed: 11/16/2022]
Abstract
The paper examines the surface functionalization of a new type of Ti-graphite composite, a dental biomaterial prepared by vacuum low-temperature extrusion of hydrogenated-dehydrogenated titanium powder mixed with graphite flakes. Two experimental surfaces were prepared by laser micromachining applying different levels of incident energy of the fiber nanosecond laser working at 1064 nm wavelength. The surface integrity of the machined surfaces was evaluated, including surface roughness parameters measurement by contact profilometry and confocal laser scanning microscopy. The chemical and phase composition were comprehensively evaluated by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction analyses. Finally, the in vitro tests using human mesenchymal stem cells were conducted to compare the influence of the laser processing parameters used on the cell's cultivation and osteo-differentiation. The bioactivity results confirmed that the surface profile with positive kurtosis, platykurtic distribution curve and higher value of peaks spacing exhibited better bioactivity compared to the surface profile with negative kurtosis coefficient, leptokurtic distribution curve and lower peaks spacing.
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Affiliation(s)
- Peter Šugár
- Institute of Production Technologies, Faculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, Slovakia; (B.L.); (J.Š.)
- Correspondence: (P.Š.); (M.H.K.); Tel.: +421-917-367-301 (P.Š.); +420-224-965-996 (M.H.K.)
| | - Barbora Ludrovcová
- Institute of Production Technologies, Faculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, Slovakia; (B.L.); (J.Š.)
| | - Marie Hubálek Kalbáčová
- Institute of Pathological Physiology, 1st Faculty of Medicine, Charles University in Prague, U Nemocnice 5, Praha 2, 128 53 Prague, Czech Republic
- Correspondence: (P.Š.); (M.H.K.); Tel.: +421-917-367-301 (P.Š.); +420-224-965-996 (M.H.K.)
| | - Jana Šugárová
- Institute of Production Technologies, Faculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, Slovakia; (B.L.); (J.Š.)
| | - Martin Sahul
- Institute of Materials Science, Faculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, Slovakia;
| | - Jaroslav Kováčik
- Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 13 Bratislava, Slovakia;
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Palcut M, Ďuriška L, Černičková I, Brunovská S, Gerhátová Ž, Sahul M, Čaplovič Ľ, Janovec J. Relationship between Phase Occurrence, Chemical Composition, and Corrosion Behavior of as-Solidified Al-Pd-Co Alloys. Materials (Basel) 2019; 12:ma12101661. [PMID: 31121821 PMCID: PMC6566661 DOI: 10.3390/ma12101661] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/07/2019] [Accepted: 05/20/2019] [Indexed: 11/16/2022]
Abstract
The microstructure, phase constitution, and corrosion performance of as-solidified Al70Pd25Co5 and Al74Pd12Co14 alloys (element concentrations in at.%) have been investigated in the present work. The alloys were prepared by arc-melting of Al, Pd, and Co lumps in argon. The Al74Pd12Co14 alloy was composed of structurally complex εn phase, while the Al70Pd25Co5 alloy was composed of εn and δ phases. The corrosion performance was studied by open circuit potential measurements and potentiodynamic polarization in aqueous NaCl solution (3.5 wt.%). Marked open circuit potential oscillations of the Al70Pd25Co5 alloy have been observed, indicating individual breakdown and re-passivation events on the sample surface. A preferential corrosion attack of εn was found, while the binary δ phase (Al3Pd2) remained free of corrosion. A de-alloying of Al from εn and formation of intermittent interpenetrating channel networks occurred in both alloys. The corrosion behavior of εn is discussed in terms of its chemical composition and crystal structure. The corrosion activity of εn could be further exploited in preparation of porous Pd–Co networks with possible catalytic activity.
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Affiliation(s)
- Marián Palcut
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia.
| | - Libor Ďuriška
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia.
| | - Ivona Černičková
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia.
| | - Sandra Brunovská
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia.
| | - Žaneta Gerhátová
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia.
| | - Martin Sahul
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia.
| | - Ľubomír Čaplovič
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia.
| | - Jozef Janovec
- Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24 Trnava, Slovakia.
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