Matěj Březina

Brno University of Technology

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Jaromír Wasserbauer

Brno University of Technology

Martin Buchtík

Brno University of Technology

Leoš Doskočil

Brno University of Technology

Pavel Doležal

Brno University of Technology

Stanislava Fintová

Czech Academy of Sciences, Institute of Physics of Materials

Michaela Hasoňová

Brno University of Technology

Jiří Másilko

Brno University of Technology

Daniel Kajánek

University of Žilina

Tomáš Opravil

Brno University of Technology

Petr Ptáček

Brno University of Technology

Cooperative Institutions

Brno University of Technology

Masaryk University

Central European Institute of Technology

University of Žilina

University of Chemistry and Technology, Prague

Palacký University Olomouc

Comenius University Bratislava

Czech Academy of Sciences

Institute of Chemical Technology

Czech Academy of Sciences, Institute of Physics of Materials

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Synthesis of Ag and Cu nanoparticles by plasma discharge in inorganic salt solutions

Nanotechnology Reviews (2023)

Jakub Horák Anton Nikiforov František Krčma Matěj Březina Zdenka Kozáková

Abstract In recent years, nanoparticles have emerged as an important player in a broad range of applications, especially thanks to recent advances in their synthesis. The silver and copper nanoparticles are often used due to their antibacterial and fungicidal activities, and this article presents the results of the nanoparticle synthesis using electrical glow discharge generated directly in a volume of their salt solutions. Therefore, there is no influence of air ( i.e . reactive nitrogen species) as it is usual in other commonly used approaches. Nanoparticles were prepared under various experimental conditions, and they were characterized by ultraviolet/visible spectrometry, dynamic light scattering, X-ray photoelectron spectroscopy, and high-resolution scanning electron microscopy. Particles were produced without any surfactant or stabilizing agent, and some of them showed higher resistance against agglomeration during their short-term (days) storage. The nanoparticle formation mechanism was confirmed by the fast camera imaging. Thus, the developed approach can be applied for simple environmentally friendly nanoparticle production for various applications.

Silver nanoparticle

Environmentally Friendly

10.1515/ntrev-2022-0549

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Citations (3)

Evolution of microstructure and electrochemical corrosion characteristics of cold compacted magnesium

Koroze a ochrana materialu (2017)

Matěj Březina Pavel Doležal Michaela Krystýnová Jozef Minda Josef Zapletal

Abstract The main advantage of magnesium and its alloys is high specific strength and biocompatibility. A modern approach to magnesium-based materials preparation is powder metallurgy. This technique allows preparation of new materials with a unique structure, chemical composition, and controlled porosity. In this study, cold compaction of magnesium powder was studied. Magnesium powder of average particle size of 30 μm was compacted applying pressures of 100 MPa, 200 MPa, 300 MPa, 400 MPa and 500 MPa at laboratory temperature. Influence of compacting pressure was studied with microstructural and electrochemical corrosion characteristics analysis. The resulting microstructure was studied in terms of light and electron microscopy. Obtained electrochemical characteristics were compared with those of wrought magnesium. Compacting pressure had a significant influence on microstructure and electrochemical characteristics of prepared bulk magnesium. With the increase in compaction pressure, the porosity decreased. Compacting pressures of 300 MPa, 400 MPa and 500 MPa led to the similar microstructure of the prepared material. Polarization resistance of compacted magnesium was much lower and samples degraded faster when compared to wrought magnesium. Also, the corrosion degradation mechanism changed due to the microstructural differences between the material states.

Powder Metallurgy

10.1515/kom-2017-0015

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Citations (5)

The importance of current mode on the properties of PEO coatings deposited on the surface of powder metallurgy-produced Mg substrate

Metal ... (2024)

Martin Buchtík Pavlína ŠOMANOVÁ Eliška KOBZINKOVÁ Matěj Březina Leoš Doskočil

Powder Metallurgy

Mode (computer interface)

10.37904/metal.2024.4945

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The Role of Humic Acid in the Corrosion of AZ31 Magnesium alloy

NANOCOM ... (2021)

Leoš Doskočil Jiří Honč Matěj Březina Jaromír Wasserbauer

Magnesium alloys used as sacrificial anodes can interact with humic acids (HAs) in soil and water environments.Therefore, these natural organic molecules can have an impact on the corrosion behaviour of magnesium materials.In this work, the aim was to investigate the effect of lignitic HA on the corrosion of AZ31 magnesium alloy in 3.5 % NaCl at different pH (5, 7 and 9).The results showed that HA increased the corrosion rate about four times at pH 7, while it weakly decreased the corrosion rate at pH 5 and 9.The acceleration of corrosion is probably related to the depletion of Mg 2+ ions by forming complexes with HA instead of producing Mg(OH)2.The increase in corrosion resistance may be related to the reduced stability of the complexes and adsorption on the AZ31 alloy surface at pH 5 and 9. Surface analysis suggested that the presence of HA promotes the formation of Mg(OH)2 nanoparticles.

10.37904/nanocon.2021.4331

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Citations (4)

Preparation and Characterization of Zinc Materials Prepared by Powder Metallurgy

Metals (2017)

Michaela Krystýnová Pavel Doležal Stanislava Fintová Matěj Březina Josef Zapletal

The use of zinc-based materials as biodegradable materials for medical purposes is offered as a possible alternative to corrosion-less resistant magnesium-based materials. Zinc powders with two different particle sizes (7.5 µm and 150 µm) were processed by the methods of powder metallurgy: cold pressing, cold pressing followed by sintering and hot pressing. The microstructure of prepared materials was evaluated in terms of light optical microscopy, and the mechanical properties were analyzed with Vickers microhardness testing and three-point bend testing. Fractographic analysis of broken samples was performed with scanning electron microscopy. Particle size was shown to have a significant effect on compacts mechanical properties. The deformability of 7.5 µm particle size powder was improved by increased temperature during the processing, while in the case of larger powder, no significant influence of temperature was observed. Bending properties of prepared materials were positively influenced by elevated temperature during processing and correspond to the increasing compacting pressures. Better properties were achieved for pure zinc prepared from 150 µm particle size powder compared to materials prepared from 7.5 µm particle size powder.

Powder Metallurgy

Particle (ecology)

Hot pressing

Vickers hardness test

Characterization

10.3390/met7100396

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Citations (32)

Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Metals (2017)

Matěj Březina Jozef Minda Pavel Doležal Michaela Krystýnová Stanislava Fintová

Magnesium with its mechanical properties and nontoxicity is predetermined as a material for biomedical applications; however, its high reactivity is a limiting factor for its usage. Powder metallurgy is one of the promising methods for the enhancement of material mechanical properties and, due to the introduced plastic deformation, can also have a positive influence on corrosion resistance. Pure magnesium samples were prepared via powder metallurgy. Compacting pressures from 100 MPa to 500 MPa were used for samples’ preparation at room temperature and elevated temperatures. The microstructure of the obtained compacts was analyzed in terms of microscopy. The three-point bendisng test and microhardness testing were adopted to define the compacts’ mechanical properties, discussing the results with respect to fractographic analysis. Electrochemical corrosion properties analyzed with electrochemical impedance spectroscopy carried out in HBSS (Hank’s Balanced Salt Solution) and enriched HBSS were correlated with the metallographic analysis of the corrosion process. Cold compacted materials were very brittle with low strength (up to 50 MPa) and microhardness (up to 50 HV (load: 0.025 kg)) and degraded rapidly in both solutions. Hot pressed materials yielded much higher strength (up to 250 MPa) and microhardness (up to 65 HV (load: 0.025 kg)), and the electrochemical characteristics were significantly better when compared to the cold compacted samples. Temperatures of 300 °C and 400 °C and high compacting pressures from 300 MPa to 500 MPa had a positive influence on material bonding, mechanical and electrochemical properties. A compacting temperature of 500 °C had a detrimental effect on material compaction when using pressure above 200 MPa.

Powder Metallurgy

Brittleness

10.3390/met7110461

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Citations (28)

Structure and growth kinetic of unconventional fluoride conversion coating prepared on wrought AZ61 magnesium alloy

Surface and Coatings Technology (2020)

Juliána Drábiková Stanislava Fintová Petr Ptáček Ivo Kuběna Matěj Březina

Conversion coating

Arrhenius plot

10.1016/j.surfcoat.2020.126101

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Citations (15)

evolution of microstructure of magnesium materials prepared by SPS using various compacting pressures

Metal ... (2022)

Roman Brescher Michaela Hasoňová Matěj Březina Stanislava Fintová Pavel Doležal

Compacting pressure applied during the SPS method varies in the literature.This study evaluates the influence of the applied compacting pressure on the microstructure and porosity of sintered materials.Using spark plasma sintering (SPS), cold compacted magnesium powder (green compacts) was sintered to bulk magnesium materials.The green magnesium compacts were prepared at room temperature using 100 MPa of uniaxial pressure, which was applied for 60 s.Using SPS, the green compacts sintering was carried out at 400 °C for 10 min.Various compacting pressures were applied during sintering: 20, 40, 60, 80 and 100 MPa to analyse the influence of the pressure.The resulting microstructure and porosity strongly depended on the compacting pressure applied during SPS.An increase of the compacting pressure was shown to be beneficial for material homogeneity, while this effect was pronounced up to 60 MPa, and only a slight effect on the material porosity was observed above this pressure.

Spark Plasma Sintering

10.37904/metal.2022.4500

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PEO of AZ31 Mg Alloy: Effect of Electrolyte Phosphate Content and Current Density

Metals (2020)

Branislav Hadzima Daniel Kajánek Michal Jambor Juliána Drábiková Matěj Březina

In this work, the quality of coatings prepared by plasma electrolytic oxidation (PEO) on an AZ31 magnesium alloy were evaluated. This was done by studying the effects of the chemical composition of phosphate-based process electrolytes in combination with different applied current densities on coating thickness, porosity, micro-cracking and corrosion resistance in 0.1 M NaCl. Both processing parameters were studied in four different levels. Mid-term corrosion resistance in 0.1 M NaCl was examined by electrochemical impedance spectroscopy and based on this, corrosion mechanisms were hypothesized. Results of performed experiments showed that the chosen processing parameters and electrolyte composition significantly influenced the morphology and corrosion performance of the prepared PEO coatings. The PEO coating prepared in an electrolyte with 12 g/L Na3PO4·12H2O and using an applied current density 0.05 A/cm2 reached the highest value of polarization resistance. This was more than 11 times higher when compared to the uncoated counterpart.

Plasma electrolytic oxidation

10.3390/met10111521

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Citations (28)

Failure Mechanism and Mechanical Characteristics of NiCrBSi Coating

Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis (2019)

Martin Buchtík Matěj Březina Ondřej Vyklický Jan Filipenský Jaromír Wasserbauer

Mechanical properties of NiCrBSi coatings on plain carbon steel substrate prepared by HVOF (High velocity flame spraying) were studied in this work. Sprayed coatings with average thicknesses of 0.25 mm, 0.5 mm and 1 mm were prepared on preheated steel strips and steel strips without preheating. Chemical analysis of the coatings cross-section offered information about material structure and distribution of chemical elements within the coating. Hardness of the coating was measured with the aim to reveal the influence of coating thickness and coated substrate preheating on coating hardness. Similar hardness was observed regardless coating preparation conditions and thickness. Bend test was used for characterization of failure character of NiCrBSi thermally sprayed coatings under different thermal conditions. Higher coating thickness was beside cracking, accompanied also by coating delamination from the substrate, while also some influence of testing temperature (laboratory temperature vs. -50 °C) on coating failure characteristics were observed. No influence of the coating preparation conditions on the coating pull-off strength was observed.

Delamination

Carbon steel

10.11118/actaun201967030649

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