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Tytuł:
Wybrane własności stopowej warstwy wierzchniej na bazie wolframu, wytworzonej techniką ESD
Investigation of the selected properties of superficial layer alloyed with the tungsten electrodes using ESD technique
Autorzy:
Spadło, S.
Młynarczyk, P.
Depczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/252000.pdf
Data publikacji:
2015
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
technika ESD
elektroda wolframowa
elektroda stopowa
ESD technique
tungsten electrode
alloy electrode
Opis:
W pracy przedstawiono krótką analizę mikroosadzania elektroiskrowego z użyciem elektrody wolframowej. Metoda osadzania elektroiskrowego (ESD) jest metodą obróbki wykonywaną na obrabiarkach EDM wykorzystującą także elektrody stopowe. Elektroda jest wykonana z materiału, który ma być osadzony na powierzchni części obrabianej. Zwrócono uwagę na możliwości stosowania hybrydowego stopowania (wyładowania elektrycznego z oddziaływaniem mechanicznym) jako proces doskonalenia powierzchni dla skomplikowanych części maszyn. Powłoki przeciwzużyciowe nałożono na stal węglową C45 z wykorzystaniem mikrowyładowań elektrycznych pomiędzy powierzchnią stopowaną i drutem elektrody. Szczególną uwagę zwrócono na możliwości stosowania metody w zwiększaniu odporności na ścierania narzędzi, form wtryskowych i części maszyn. Dokonano oceny rozkładu pierwiastków w warstwie wierzchniej. Wyniki badań wykazały, że istnieje możliwość uzyskania zadowalającej jakości połączenia pomiędzy stalą C45 i nanoszoną warstwą wolframową.
The paper presents a brief study of microelectrospark deposition (ESD) with use of a tungsten electrode. The electrodischarge alloying with wire electrodes is machining method performed on using EDM machine with the help of alloy electrode. Electrode is made of material which is to be deposited on the part surface. Attention has been paid to the possibilities of applying hybrid alloying (electrical discharge deposition with mechanical interaction) as a surface improvement process for complex shape parts. The antiwear coatings were applied on carbon steel C45 with use of micro electrical discharges between alloy-ing surface and wire electrode. Special attention has been paid to the possibilities of applying mentioned method to increase abrasive wear resistance of tools, injection moulds and machine parts. Evaluation of elements distribution in the superficial layer was made. The results of investigations showed that there is a possibility to obtain the satisfying quality of joint between the carbon steel C45 and tungsten layer.
Źródło:
TTS Technika Transportu Szynowego; 2015, 12; 1411-1413, CD
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-criteria optimization method in micro-EDM using TiN coated tungsten carbide electrode
Autorzy:
Nguyen, Phan-Huu
Powiązania:
https://bibliotekanauki.pl/articles/2086282.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
micro-EDM
coated electrode
TOPSIS
Opis:
Even though the coated electrode can enhance the machining efficiency in micro-EDM process, it is essential to introduce optimization approach for further enhancing the process. Hence the present study was performed with multi-criteria optimization in micro-EDM using TiN coated tungsten carbide electrode for machining Ti-6Al-4V. The Z coordinator (Z) and tool wear rate (TWR) were used as the quality parameters to evaluate the machinability. The voltage (U), capacitance (C) and spindle rotational speed (n) were considered a the technological parameters. The Technique for order preference by similarity to ideal solution (TOPSIS) method was a suitable solution to determine the optimal result with the help of S/N analysis and by ranking. It was found that capacitance has more significant nature in the process. The optimal process parameters combination was found with better accuracy and lower prediction error of 1.03%. The better machined surface quality was also observed under optimal conditions.
Źródło:
Journal of Machine Engineering; 2022, 22, 2; 148--160
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The optimization of micro-EDM machining process when using carbon coated micro electrode as a tool
Autorzy:
Mac, Thi Bich
Shirguppikar, Shailesh
Ganachari, Vaibhav
Powiązania:
https://bibliotekanauki.pl/articles/24084638.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
micro-EDM
coated electrode
optimisation
Opis:
The amount of electrode wear in micro-EDM has a direct effect on the dimensional accuracy of the machined hole. Therefore, improving the corrosion resistance of electrodes in micro-EDM is still of great interest. The effective coating of thin film for the micro tool electrodes in the case of micro-EDM can lead to minimize the electrode wear which eventually improve the productivity and machining quality. In the present study, experiments were performed on micro-EDM using carbon coated tool electrode and optimized using Taguchi-Topsis to investigate optimum levels of Depth of cut (Z) and overcut (OVC). It was concluded that optimum conditions had improved significantly using carbon coated micro tool electrode. Optimal levels of technological parameters include V = 160 V, C = 10000 pF, RPM = 600 rpm, and Zopt = 2.525 mm, OVCopt = 65.257 µm. The quality of the machined surface with the coated electrode at optimal conditions is analysed and evaluated. The Topsis method is a suitable solution to this problem, and the steps to perform the calculation in this technique are simple.
Źródło:
Journal of Machine Engineering; 2023, 23, 2; 186--197
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation of the effect of NaCl concentration on the electrocoagulation of coal preparation plant tailings
Autorzy:
Eskibalci, M. F.
Ozkan, M. F.
Powiązania:
https://bibliotekanauki.pl/articles/110279.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal
tailing
electrocoagulation
electrode
coagulalion
Opis:
Coal preparation is the process of separating the coal from mineral impurities to produce high-grade coal, and the wastewater of the coal separation process is mainly consisted of fine coal and clay particles. Electrocoagulation (EC) is one of the effective methods for wastewater treatment. In this context, this study was aimed to investigate the evaluation of EC process for coal preparation plant wastewaters. Several key parameters affecting the efficiency of EC were investigated with laboratory scale experiments in search of optimal parameter values. Most importantly, the effect of NaCl concentration on the precipitation of coal preparation plant tailings by EC was investigated. Current density, electrolysis time, mixing speed, mixing time, pH, and salt concentration were studied using an aluminum electrode. Based on the results obtained from this study, the optimum conditions were found to be as pH 7.88 (natural pH), current density 40 (A/m2), mixing speed 360 rpm, premixing time 120 sec, and electrolysis time 300 sec. Under the optimum operating conditions, the results indicated that EC can be successfully applied for the coal preparation wastewaters, and the turbidity was reduced from 1260 NTU to 63 NTU (95% efficiency) with an operating cost of $5.67/Mg of tailings. By the increasing the salt content, a small increase in the turbidity was observed with a decrease in the voltage. With only a 1% decrease in the removal efficiency, the cost was reduced to $3.19/Mg with a 44% operating cost reduction.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 934-943
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sulfide-selective electrodes based on the sulfided monocrystals of CdSb
Autorzy:
Diichuk, V. V
Powiązania:
https://bibliotekanauki.pl/articles/134875.pdf
Data publikacji:
2014
Wydawca:
Tomasz Mariusz Majka
Tematy:
sulfidizing
semiconducting monocrystal
sulfide-sensitive electrode
Opis:
A method of formation of the sulfide-sensitive electrodes in the water-free superbasic solutions using the sulfided semiconducting CdSb monocrystals has been investigated. The effective range of the sulfide ions concentration was found and some other conditions were determined in order to ensure formation of the electrodes with the linear potential/sulfide concentration characteristics. Using the atom absorption spectrometry, the 6:1 molar ratio was found for the Cd and Sb atoms concentrations in the surface electrode film.
Źródło:
Journal of Education and Technical Sciences; 2014, 1, 1; 5-7
2300-7419
2392-036X
Pojawia się w:
Journal of Education and Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of Filler Material Effect on Properties of Excavator Crawler Track Shoe after Welding Regeneration
Autorzy:
Gucwa, M.
Winczek, J.
Wieczorek, P.
Mičian, M.
Koňár, R.
Powiązania:
https://bibliotekanauki.pl/articles/2049557.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hardfacing
carbides
hardness
wear
covered electrode
Opis:
The application of hardfacing is one of the ways to restore the functional properties of worn elements. The possibility of using filler materials rich in chrome allows for better wear resistance than base materials used so far. The paper presents the results of research on the use of 3 different grades of covered electrodes for the regeneration of worn track staves. The content of the carbon in the covered electrodes was from 0,5% to 7% and the chromium from 5% to 33%. The microscopic and hardness tests revealed large differences in the structure and properties of the welds. The differences in the hardness of the welds between the materials used were up to 150 HV units. The difference in wear resistance, in the ASTM G65 test, between the best and worst materials was almost 12 times big.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 31-36
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of a biased electrode in the production of highly charged ions using the DECRIS 14-3 ion source
Autorzy:
Leporis, M.
Bogomolov, S.
Efremov, A.
Loginov, V.
Mironov, V.
Powiązania:
https://bibliotekanauki.pl/articles/148672.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ECR ion source
plasma
biased electrode
Opis:
ECR ion sources are used for the production of highly charged ions in various accelerator facilities. In most of them biased electrodes are normally used to increase the ion yield. Physical processes in the plasma of an ion source are quite complicated and the role of a biased electrode is not clear. To investigate the effect of a biased electrode on the intensity of extracted highly charged ions, an axially movable electrode was placed into the plasma chamber of the DECRIS 14-3 ion source. It was found that the intensity of Ar ions depends on the position of the biased electrode and negative bias voltage. The optimal position of the biased electrode was found near the maximum of the magnetic field. Experiments with a pulsed biased electrode were also carried out. The influence of the negative pulse on the ion yield depends on the ion charge state.
Źródło:
Nukleonika; 2003, 48,suppl.2; 89-92
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the properties of high chromium cast iron overlay welds deposited by tubular electrodes
Badanie własności warstw napawanych żeliwem chromowym elektrodami otulonymi rurkowymi
Autorzy:
Szymura, M.
Czupryński, A.
Różański, M.
Powiązania:
https://bibliotekanauki.pl/articles/115051.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
napawanie
elektroda rurkowa
elektroda otulona
ścieranie
żeliwo chromowe
hardfacing
tubular electrode
covered electrode
abrasion
chromium cast iron
Opis:
In the paper, there were shown the results of research on the properties of overlay welds consisted of one and three layers deposited by three types of tubular electrodes of the Fe-Cr-C alloy, Fe-Cr-C-Nb-Mo-W-V alloy and composite consist of tungsten carbide particles in the Fe-Cr-C alloy matrix. The study of hardfacing deposits included: test of metal-mineral abrasion resistance, metallographic examinations, analysis of chemical composition, and hardness tests. The test of abrasive usage in metal-mineral friction was made according to the procedure A of the ASTM G 65 standard.
W artykule przedstawiono wyniki badania własności napoin jedno- i trójwarstwowych wykonanych trzema rodzajami elektrod rurkowych ze stopów Fe-Cr-C, Fe-Cr-C-Nb-Mo-W-V oraz kompozytu składającego się z cząstek węglika wolframu w osnowie ze stopu Fe-Cr-C. Badania napoin obejmowały: badania odporności na zużycie ścierne typu metal-minerał, badania metalograficzne, analizę składu chemicznego oraz pomiar twardości. Badanie odporności na zużycie ścierne typu metal-minerał przeprowadzono zgodnie z normą ASTM G 65, procedura A.
Źródło:
Welding Technology Review; 2018, 90, 10; 26-30
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the properties of lignins as potential carbon precursors
Autorzy:
Mielan, Bartosz
Musioł, Patrycja
Tomala, Janusz
Błażewicz, Stanisław
Frączek-Szczypta, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/2010830.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
lignin
carbonization
carbon electrode
graphitization
renewable resources
Opis:
Due to growing interest in the application of renewable resources in industry, there is a need for new carbon precursors. Lignin is a natural polymer and the main by-product of the paper industry, but its application on an industrial scale is limited. Due to its chemical composition and high aromatic carbon content, combined with a lack of toxicity, it may be a promising candidate for a carbon precursor, as well as – in carbon electrode technology – a carbon binder. The main disadvantage of lignins is the variety of their types, with differing properties. There is a need to establish the relationship between the structure of lignin and its carbon precursor potential. In this work, an attempt was made to find the dependence between the lignin structure and its properties before (chemical composition, structural studies) and after thermal treatment under an inert atmosphere (carbon residue, bonding properties and degree of carbonization and graphitization), using different techniques (FTIR, Raman spectroscopy, XPS, TG, SEM) on two softwood lignins – alkali lignin and kraft lignin. The results proved that both lignins are good candidates for carbon precursors (high mass residue after heat treatment), but only kraft lignin exhibits the bonding properties which are crucial for application as a carbon binder.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2020, 63, 206; 19-34
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of electrolyte low loss in typical ECM gaps
Autorzy:
Paczkowski, T.
Zdrojewski, J.
Bujnowski, S.
Janicki, D.
Powiązania:
https://bibliotekanauki.pl/articles/99886.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
ECM
electrolyte flow loss
curvilinear electrode surfaces
Opis:
This paper presents the results of research of hydraulic loss during electrolyte flow through gaps typical for ECM machining. The research was conducted on a test station where inducing an oscillatory movement of electrodes was possible. Appropriately prepared electrodes with curvilinear outlines were placed in a machining unit which allowed for measuring the pressure of the electrolyte flow in eight points on the electrode surface and also interelectrode gap inlet and outlet. Additionally, the results of pressure measurements were compared with results obtained from a computer simulation.
Źródło:
Journal of Machine Engineering; 2012, 12, 2; 86-91
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Surface Treatment Effluents by Electrocoagulation Process Using Aluminium Electrodes
Autorzy:
Namoussi, Soukaina
Merbouh, Chaimaa
Kabriti, Mohamed
Nahli, Abdelmottalib
Naamane, Ayoub
Chlaida, Mohamed
Iounes, Nadia
Powiązania:
https://bibliotekanauki.pl/articles/2025816.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
electrocoagulation
aluminium electrode
surface treatment
effluent
pollutant
Opis:
The surface treatment industry generates effluents with a high load of highly toxic chemicals which must be treated under increasingly stringent regulation. The aim of this study was to treat the effluents of surface treatment unit of an aeronautical industry by the electrocoagulation process using aluminium electrodes. This process is used to study the performance to remove colloidal load, significant amount of oxidizable material and high levels of various metal elements (Cr, Fe, Zn, Cu and Al) from these effluents, under optimum conditions of pH 7, 8.6A of current intensity and 60 min of application. The electrocoagulation process was found to be effective in reducing turbidity (97.12%), COD (97.5%), SS (97.84%) and conductivity (96.82%), hexavalent chromium (99.99%), Zn (96.82%), Cu (94.3%), Iron (99.9%), Al (91.96%). The treated effluent conformed to the Moroccan standards of surface treatment discharge.
Źródło:
Journal of Ecological Engineering; 2022, 23, 1; 91-99
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Procedure for correction of the ECG signal error introduced by skin-electrode interface
Autorzy:
Tomczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/221734.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
identification of skin-electrode interface
signals reconstruction
Opis:
The paper presents a procedure for correction of the error of an ECG signal, introduced by the skin-electrode interface. This procedure involves three main measuring-calculating stages: parametrical identification of the mathematical model of the interface, realized directly before the diagnostic measurements, registration of the signal at the output of electrodes as well as reconstruction of the input signal of the interface. The first two stages are realized in the on-line mode, whereas the operation of signal reconstruction presents a numerical task of digital signal processing and is realized in the off-line mode through deconvolution of the registered signal with the transfer function of the skin-electrode interface. The aim of the paper is to discuss in detail the procedure of parametric identification of the skin-electrode interface with the use of a computer system equipped with a DAQ card and LabVIEW software. The algorithm for error correction introduced by this interface is also presented.
Źródło:
Metrology and Measurement Systems; 2011, 18, 3; 461-470
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Plasma Actuator with Two Mesh Electrodes to Active Control of Boundary Layer at 50 Hz Power Supply
Autorzy:
Gnapowski, Ernest
Pytka, Jarosław
Gnapowski, Sebastian
Józwik, Jerzy
Tomiło, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2201893.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
plasma actuator
DBD
lift coefficient
mesh electrode
Opis:
Numerous studies are conducted to improve the flow in the boundary layer to ensure laminar flow and in particular to increase flight safety. A new solution used to improve the laminar flow is the plasma actuator. The classic configuration of DBD plasma actuators is commonly used with the asymmetric electrode system. The manuscript describes the results of tests with a plasma actuator. Experimental tests were carried out on the built model of the wing with the SD 7003 profile, a plasma actuator was mounted on the upper surface. In contrast to the commonly used solution with solid tape copper electrodes, the novelty in the described research in the manuscript is the use of a large GND electrode (covering 70% of the upper surface of the wing) and a HV mesh electrode. The use of a plasma actuator on the upper surface of the wing affects the air flow in the boundary layer as a result of air ionization. The tests were carried out for a supply voltage from V = 7.0 kV to 12 kV and Reynolds number, Re = 87500 to 240000, flow velocity during the tests in the tunnel was in the range of U = 5-15 m/s and the angle of attack α = 5 -15 degrees. On the basis of the results experimental tests, the percentage change in the lift coefficient was calculated for the switched on and off DBD system. The obtained results indicate a maximum 17% increase in the lift coefficient for the plasma actuator activated for air flow U = 5 m/s and angle of attack α = 5 degrees. In the remaining configurations, changes in the lift coefficient amounted to 4%.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 58--63
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified solid ion-selective electrode for potentiometric determination of sulfide in oil refineries water
Autorzy:
Abdullad, Zeyad K.
Al-Samarrai, Shatha Y.
Powiązania:
https://bibliotekanauki.pl/articles/35520351.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
ion-selective electrode
silver sulfide
oil refineries
water
Opis:
A selective electrode was manufactured to determine the sulfur ions by sedimentation method in industrial waters in oil refineries of North Refineries Company, Baiji, Iraq. The linear response on a wide range of concentration (from 1.0·10–1 to 1.0·10–6M) Na2S with a Nernst response of 28.229 mv per decade, theoretical value for slope of 29.58 mv per decade, correlation factor of 0.9998, detection limit of 2.287·10–7 at 25–35°C, pH 6.0–12.0, and the best concentration of the filling solution of 10–6M with a fast response time (5–13 s). The direct method were %RSD for 0.5772– –0.7430, %RE for –0.1, 3.7 and %REC for 99.9, 103.7.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 1; 98-105
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The research methodology of powders with particle size of under 500 microns
Autorzy:
Żegleń, K.
Grygier, D.
Ambroziak, A.
Żak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1190004.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metodologia
druty proszkowe
proszki
methodology
tubular electrode
powders
Opis:
Wyniki przedstawione w artykule są zobrazowaniem metodologii będącej tematem tej pracy. Zawiera ona opis głównych metod badań jak obserwacje mikroskopowe, analiza sitowa oraz określanie składu chemicznego z wykorzystaniem detektora EDX. Wyniki przedstawiają określenie kształtu cząstek, określenie wielkości cząstek wraz z wyróżnieniem frakcji o największym udziale procentowym oraz określenie składu chemicznego. Celem artykułu jest przedstawienie kolejności wykonywania badań dotyczących proszku żelaza o granulacji do 250 mikrometrów. Badania te można również z powodzeniem zastosować do określania wymienionych wielkości proszków o granulacji do 500 mikrometrów.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2016, 4, 1; 15--18
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical Method of Copper Powder Synthesis on Rotating Electrode in the Presence of Surfactants
Autorzy:
Wojtaszek, K.
Cebula, F.
Partyka, B.
Deszcz, P.
Włoch, G.
Socha, R. P.
Woźny, K.
Żabiński, Piotr
Wojnicki, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2203711.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper powder
electrochemical synthesis
rotating electrode
ethylene glycol
Opis:
This paper presents a method of synthesizing copper powders by electrochemical method with the use of a rotating working electrode. The influence of the rotation speed of the working electrode, the current density, the concentration of copper ions, and the addition of ethylene glycol on the shape, size, and size distribution of the obtained powders were investigated. Properties of the synthesized powders were characterized by scanning electron microscopy (SEM) and X-ray powder diffractometry (XRD). It has been shown that it is possible to obtain copper powders with a size of 1 µm by an electrochemical method using the rotary cathode, in sulphate bath with addition of ethylene glycol as a surfactant. Increasing current density causes a decrease in the average size of the obtained powder particles. The addition of 2.5% of ethylene glycol prevents the formation of dendritic powders. The change in the concentration of copper ions in the range from 0.01 to 0.15 mol/dm3 in the electrolyte did not show any significant effect on the size of obtained particles. However, higher concentrations of copper limiting the presence of dendritic-shape particles. Changing the speed of rotation of the electrode affects both the size and the shape of synthesized copper powder. For the rotational speed of the electrode of 115 rpm, the obtained powders have a size distribution in the range of 0-3 µm and an average particle size of 1 µm. The particles had a polygonal shape with an agglomeration tendency.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 375--386
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of process parameters on the condition of the wire electrode in WEDM of Ti6Al4V
Autorzy:
Zaborski, S.
Poroś, D.
Powiązania:
https://bibliotekanauki.pl/articles/1429400.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
titanium alloys
wire electrode
artificial neural networks
WEDM
Opis:
Conventional machining of titanium alloy Ti6Al4V cause high temperature and rapid wear of tool which makes him hardly suitable for machining by machine cutting. The presented experimental study was carried out on a modern wire EDM Sodick AQ327L. Three types of the wire were used. Investigated were the effects of such input parameters as the pulse width and the time between two pulses on the output parameters such as area cutting efficiency, workpiece surface roughness and wear rate of the electrode. The resulting relationships were determined using the conventional regression analysis and neural networks. The results were checked for goodness of fit.
Źródło:
Journal of Machine Engineering; 2008, 8, 2; 52-64
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Idea of the experimental stand for micro-electrical discharge machining using carbon fibres as the tool electrodes
Autorzy:
Trych, A.
Markiewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/100113.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
micro-electrical discharge machining
tool electrode
carbon fibres
Opis:
The paper deals with the idea and design solutions for a special experimental stand and consequently a preliminary study of the future machine tool for micro-electrical discharge machining with carbon fibre as tool electrodes. The main requirements are introduced and, particularly for such purpose unusual conditions that must be assured are presented. Solutions that were used as well as some initial concepts are discussed and assessed. The paper is enriched with an extensive illustrative material of designed solutions for each important part responsible for the proper functioning of the respective components. The evaluation of existing solutions as well as the further issues that must be developed are analyzed.
Źródło:
Journal of Machine Engineering; 2012, 12, 2; 105-110
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A critical review on soil ionisation modelling for grounding electrodes
Autorzy:
Mokhtari, M.
Abdul-Malek, Z.
Gharehpetian, G.B.
Powiązania:
https://bibliotekanauki.pl/articles/950672.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grounding electrodes
grounding electrode resistance
soil ionisation modelling
Opis:
Grounding electrode resistance non-linearly changes under impulse conditions due to soil ionisation phenomenon. Several models have been proposed to model soil ionisation for grounding electrodes applications. However, to date, there is yet an attempt made to compile all these works into a comprehensive review article. Therefore, this paper is written with the objective of summarizing all related works in this field as a one– stop reference. With reference to the literature, this paper is written to summarize the working principles of the soil ionisation models as well as the accuracy and performance analysis of the models. This paper, particularly highlights the deficiencies of the available models in terms of accuracy and performance. This knowledge will contribute to the development of a new accurate and efficient soil ionisation model.
Źródło:
Archives of Electrical Engineering; 2016, 65, 3; 449-461
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of two- and three-electrode systems in measurements of potential oxygen flux density in soil
Autorzy:
Bieganowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/25265.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
two-electrode system
soil oxygen flux
soil aeration
measurement
oxygen diffusion rate
soil
three-electrode system
oxygen flux density
potential
Źródło:
International Agrophysics; 2004, 18, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konstrukcja i właściwości czujników potencjometrycznych do oznaczania ketoprofenu
Construction and properties of potentiometric sensors for ketoprofen determination
Autorzy:
Lenik, J.
Powiązania:
https://bibliotekanauki.pl/articles/157052.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
czujnik potencjometryczny
elektroda z ciekłym kontaktem
elektroda ze stałym kontaktem
ketoprofen
potentiometric sensor
electrode with liquid contact
electrode with solid contact
Opis:
Celem prezentowanej pracy było skonstruowanie membranowych elektrod jonoselektywnych do oznaczania ketoprofenu. Zastosowano czujniki z ciekłym kontaktem ISE (typ IS 561, Philips) oraz czujniki ze stałym kontaktem typu BMSA (Zakład Chemii Analitycznej i Analizy Instrumentalnej UMCS) zawierające hydrofobowe pary jonowe w mikroporowatej (z polichlorku winylu) warstwie matrycowej. Wyznaczono podstawowe parametry analityczne czujników tj. zakres pomiarowy, nachylenie charakterystyki, granicę wykrywalności, współczynniki selektywności, czas odpowiedzi, zależność SEM od pH, czas życia.
The aim of the presented work was to create membrane ion-selective electrodes for ketoprofen determination. There were used sensors with liquid contact so called conventional ion-selective electrode ISE (type IS 561, Philips) and sensors with solid contact so called BMSA (Institute of Analytical Chemistry and Instrumental Analysis UMCS) containing hydrophobic ion pairs in the microporous (PVC) matrix layer. The latter electrode does not have any inner solution and it posses all the advantages of the "coated wire electrodes" (CWE). The following basic electrode parameters were investigated: measurement range, slope of characteristic, limit of detection, response time, dependence of the electrode potential on pH, lifetime and selectivity coefficients in relation to some organic and inorganic anions. The ketoprofen electrode was used for ketoprofen determination in the synthetic sample and pharmaceutical Ketonal (Lek Pharmaceuticals d.d. Slovenia) within the concentration range of 25.43 - 25430 žg/ml in water solution at pH 5.0 - 9.5. The statistical parameters (Recovery 100,6%, RSD =5,5%) show the typical accuracy of the analytical methods employing ion - selective electrodes.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 5, 5; 440-442
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of impurities on the operation of selected fuel ignition systems in combustion engines
Autorzy:
Różowicz, S.
Tofil, S.
Powiązania:
https://bibliotekanauki.pl/articles/141085.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrode burning
fuel mixture impurities
ignition system
spark plugs
Opis:
The paper attempts to determine the impact of fuel impurities on the spark discharge energy and the wear of the spark plug electrode. Spark plugs were analyzed in two typical configurations of the ignition system. A number of tests were conducted to determine the wear of the spark plug electrode exposed to different types of impurities. The spark discharge energy for new and worn spark plugs was determined through calculation.
Źródło:
Archives of Electrical Engineering; 2016, 65, 2; 349-360
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon Nanotubes Counter Electrode for Dye-Sensitized Solar Cells Application
Autorzy:
Drygała, A.
Dobrzański, L. A.
Szindler, M.
Prokopiuk vel Prokopowicz, M.
Pawlyta, M.
Lukaszowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/352593.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dye-sensitized solar cells
counter electrode
carbon nanotubes
TEM
Opis:
The influence of the carbon nanotubes counter electrode deposited on the FTO glass substrates on the structure and optoelectrical properties of dye-sensitized solar cells counter electrode (CE) was analysed. Carbon materials have been applied in DSSC s in order to produce low-cost solar cells with reasonable efficiency. Platinum is a preferred material for the counter electrode because of its high conductivity and catalytic activity. However, the costs of manufacturing of the platinum counter electrode limit its use to large-scale applications in solar cells. This paper presents the results of examining the structure and properties of the studied layers, defining optical properties of conductive layers and electrical properties of dye-sensitized solar cells manufactured with the use of carbon nanotubes. Such counter electrodes are promising for the future fabrication of stable, low-cost and effective dye-sensitized solar cells.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 803-806
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single-piece all-solid-state Co(II) ion-selective electrode for cobalt monitoring in real samples
Autorzy:
Wardak, C.
Grabarczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2082867.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
cobalt(II) ion-selective electrode
ionic liquids
solid contact
potentiometry
Opis:
A novel single-piece all-solid-state ion-selective electrode for Co2+ determination has been prepared. The PVC membrane was modified by the addition of ionic liquid. The effect of various ionic liquids was studied in detail and improved performance was observed. The best performance exhibited by the electrode was achieved with a membrane containing 1-ethyl- 3-methyl imidazolium chloride, having a slope of 31.8 mV/ decade in a wide concentration range of 1×10-7 – 1×x10-1 mol L-1. The limit of detection was 5.6×10-8 mol L-1. The response time of the proposed sensor was less than 10 s and the lifetime was at least three months. The proposed sensor showed good selectivity towards the Co2+ ion in comparison with some alkali, alkaline earth, transition and heavy metal ions. It was successfully applied for the direct determination of cobalt ions in real sample solution.
Źródło:
International Agrophysics; 2020, 34, 1; 17-24
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bead-on-Plate Underwater Wet Welding on S700MC Steel
Autorzy:
Tomków, Jacek
Świerczyńska, Aleksandra
Landowski, Michał
Wolski, Adrian
Rogalski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2023305.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
MMA welding
high-strength steel
underwater wet welding
covered electrode
Opis:
The participation of high strength steels in marine and offshore structures is increasing, which makes it necessary to develop recommendations for underwater repair welding works. The article presents the results of bead-on-plate welded specimens made of S700MC high strength steel in underwater wet welding conditions by covered electrodes. Three specimens with heat input values in the range 0.91-1.05 kJ/mm were made. The specimens were subjected to visual, metallographic, macro- and microscopic tests as well as hardness measurements using the Vickers method. It was found that the higher heat input leads to formation of mixed bainite-martensite microstructure in the heat-affected zone (HAZ). Lower heat input value results in presence of martensite in HAZ. It was shown that in the scope of the performed tests, the maximum hardness of HAZ did not exceed the critical value for the material group, and the increase in heat input caused the decrease of hardness by about 25 HV10.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 288-296
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 101

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