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Publications
Publications (25)
In this paper, we present a quantitative assessment of muscle fatigue using surface electromyography (sEMG), a widely recognized method that is conducted through various analytical approaches, including analysis of spectral and time-frequency distributions. Existing research in this field has demonstrated considerable variability in the computation...
In the scientific literature focused on surface electromyography (sEMG) and functional near-infrared spectroscopy (fNIRS), which have been described together and separately many times, presenting different possible applications, researchers have explored a diverse range of topics related to these advanced physiological measurement techniques. Howev...
Iron aluminium alloys, especially those sintered from elemental powders, suffer from low ductility. In this paper, an iron aluminium alloy (Fe40Al) produced by pressure-assisted induction sintering from elemental powders is shown and described. Samples produced by this method show an unexpectedly high ductility in the compression test that is an or...
In this work, aluminum (Al) anodization in malic acid electrolytes of different concentrations (0.15 M, 0.25 M, and 0.5 M) was studied. The close-packed hexagonal pore structure was obtained for the first time in this organic acid in a 0.5 M solution, at 250 V and temperature of 5 °C. Moreover, the process was investigated as a function of the numb...
Data from the literature indicate a significant influence of powder refinement on the kinetics and the structure of an obtained material. Decreasing the size of aluminum particles has little or no effect, whereas decreasing the size of iron particles has a significant influence. In this work, detailed results from this research on the influence of...
The morphology of anodic aluminum oxide (AAO) produced by hard anodization (HA) in oxalic acid electrolyte modified with various amount of ethylene glycol (EG) was investigated. The EG induces a considerable changes in the AAO morphology. The AAO transforms from continuous nanoporous film to separated AAO nanotubes upon addition of increasing amoun...
The 50μm thick Ni3Al thin foils were investigated as the solid-state catalyst. In this study, a cyclic Ni3Al catalysts pretreatment process was performed to obtain more uniform carbon nanotubes and gradual fragmentation of Ni nanoparticles. In temperature about 500oC the cyclic methanol decomposition was conducted. The change of hydrogen yield in m...
This paper presents the results of studies on the influence of oxygen partial pressure (vacuum level in the chamber) on the properties of FeAl intermetallics. One of the problems in the application of classical methods of prepared Fe-Al intermetallic is the occurrence of oxides. Applying a vacuum during sintering should reduce this effect. In order...
In this work, the pressure-assisted induction sintering (PAIS) method, is being presented. The specimens (a cylindrical shape, diameter of 50 mm, height of 10 mm) was heated by a induction coil with heating speed of about 220 K/s to temperature 800°C, 850ºC, 900ºC, 950ºC and 1000ºC. During this process, the temperature of specimen was measured by f...
a b s t r a c t Pressure-assisted induction sintering (PAIS) method was compared with other methods, such as spark plasma sintering (SPS) or hot pressing (HP) applied nowadays in industry, to achieve dense sinters. The advantages of the PAIS method over the other methods were presented and problems which need to be overcome in order to make the PAI...
A Pulse Plasma Sintering (PPS) process was employed to manufacture Cu-diamond composites with a 50% volume fraction of each constituent. Pure and Cr (0.8wt.%) alloyed copper matrices were used and commercial diamond powders. The composites were sintered at temperature of 900°C for 20 min and under pressure of 60 MPa. In these sintering conditions d...
Nanocrystalline WC-12wt.%Co was consolidated by Pulse Plasma Sintering (PPS) at various temperatures between 900 and 1200 o C for 6 minutes under a pressure of 60MPa. Cemented carbides sintered at 1100 o C have a relative density of 99%, a hardness of 2248HV30, the fracture toughness, K IC =12.5 MPa*m 1/2 , and have a structure containing 50nm WC c...
Additive manufacturing of metal components by the Laser-Engineered Net Shaping (LENS) is a rapid manufacturing process, in which metal powder is injected into a molten pool formed by controlled laser heating of the substrate. By moving the workpiece, 3-D structures are built line by line and layer by layer. In our work, the feasibility of manufactu...
Pulse Plasma Sintering (PPS) method was applied for sintering novel tungsten carbide (WC) composites. Nanoparticles of WC were used and iron manganese alloys were proposed as substitutes of expensive and irritating cobalt binder. Investigation have shown that sinters reach close to 90% of theoretical density (TD) after no more than 10 min of sinter...
p s s current topics in solid state physics c status solidi Cemented carbides, based on the tungsten carbide (WC), are very popular and useful in an industry. The most im-portant metal us as a binder in this kind of materials is cobalt. It has many advantages as a binder: very good wettability, favourable solubility with WC and thermal conductivity...
The aim of this project is to develop a Fe-Mn alloy with properties comparable with the properties of cobalt. It will permit to replace in cemented carbides toxic cobalt by alternative non-toxic matrix. Another measurable effect of this project will a cost reduction of cemented carbides, because price of proposed Fe-Mn matrix is considerably (50 ti...
The paper presents the results of examination of the structure and properties of nanocrystalline CU-Al2O3 composites with the two different Al2O3 contents: 10 and 20 vol.%. The composites were produced using a mixture of copper and Al2O 3 powders with an average crystallite size of about 60nm for Cu and about 40nm for Al2O3. The powders were consol...
Nanocrystalline copper powders, produced by the reduction of the CuO with hydrogen, were consolidated using the pulse plasma sintering (PPS) method. The sintering process was carried out at temperatures between 500 and 900 °C under a load of 60 MPa for 5 min. The average crystallite size of the sintered component obtained at 500 °C was about 80nm a...
Nanocrystalline WC-12wt.%Co was consolidated by Pulse Plasma Sintering (PPS) at various temperatures between 900 and 1200°C for 6 minutes under a pressure of 60MPa. Cemented carbides sintered at 1100°C have a relative density of 99%, a hardness of 2248HV30, the fracture toughness, KIC=12.5 MPa*m1/2, and have a structure containing 50nm WC crystalli...
The paper presents the results of examinations of the NiAl–Al2O3 sinters (13, 38 and 55 vol% of Al2O3) produced from a mixture of nickel, aluminum and alumina powders in a single technological process, using the pulse plasma sintering (PPS) method. By subjecting the elemental powders to a PPS process for 900 s, we obtained NiAl–Al2O3 composites of...
