Zydrunas Kavaliauskas

Zydrunas Kavaliauskas
Kauno Kolegija

About

26
Publications
3,232
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86
Citations
Citations since 2016
12 Research Items
71 Citations
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201620172018201920202021202205101520
201620172018201920202021202205101520

Publications

Publications (26)
Article
Full-text available
The plasma-activated reactive evaporation technique was used for the formation of indium-tin-oxide (ITO) films. The ITO films were deposited on a heated (up to 350 °C) glass substrates using various mass ratios of indium and tin. The optical and electrical properties of the deposited ITO films were determined. The influence of the indium-to-tin mas...
Article
Full-text available
An electronic monitoring system was developed to monitor and analyze operating and environmental parameters of solar power plants. The electronic monitoring system consisted of two stages: the first stage was designed to receive data from temperature, illumination, voltage, electric current, and power sensors and modules; the second stage is for da...
Article
Full-text available
A transferred arc plasma torch chemical rector was used to process waste formed from mixtures of dry clay powder and hydroquinone. Such reactors are best suited for the treatment of electrically conductive waste. In these types of reactors, the electric arc moves chaotically throughout the entire reactor volume, making it possible to ensure an even...
Article
Full-text available
In recent decades, the growing number of citizens and improving life quality have increased energy consumption in the world and Europe, as well as in Lithuania. Despite the fact that an increasing number of countries are focusing on the development of renewable energy, most of the energy is produced by using fossil fuels. As a result, climate chang...
Article
Full-text available
Plasma spraying and magnetron sputtering were used to form graphite–copper films on an n-type silicon surface. The main objective of this work was to compare the properties of the obtained graphite–copper Schottky photodiodes prepared using two different layer formation methods and to evaluate the influence of copper content on the surface morpholo...
Article
Full-text available
Al2O3 and Al2O3-ZrO2 coatings were deposited on stainless steel using atmospheric plasma spraying. The influence of arc current and zirconia addition on the surface morphology of the coating, phase composition and tribological properties under dry sliding conditions were investigated. The addition of zirconia reduced the surface roughness of the co...
Article
Yttria-stabilized zirconia (YSZ) coatings were deposited at various arc currents of atmospheric plasma spraying. Two different technological configurations were used to form YSZ coatings; in first case, the plasma torch moved along the coated surface, while in another case, the coatings were formed on rotating substrate surface placed in front of t...
Article
This article presents various chemical synthesis techniques to form samarium-doped ceria (SDC) nanopowders that can be used as electrolyte materials for fabricating solid oxide fuel cells (SOFC). Ce0.8Sm0.2O2-δ powders were prepared by three chemical synthesis routes: glycine nitrate precursor combustion, co-precipitation and sol-gel. SDC pellets w...
Article
Full-text available
During the inactivation of various organic wastes by conventional thermal methods (distillation, desorption), the process temperature is lower than 1300-1500 0 C. However, this is not sufficient for proper decomposition of waste materials. For the complete decomposition of such materials, the reaction temperature should be raised to 1800 0 C. This...
Article
Graphite‑copper composite coatings are often used for the production of electrical machines because they are characterized by stable electrical and mechanical properties. The plasma spraying method was used to form such coatings in this work, as we aimed to evaluate the influence of copper content in the initial powders on the properties of graphit...
Article
The purpose of this research is to investigate the feasibility to utilize the slag collected after gasification of organic fuel combined with sewage sludge. The residue left after gasification process is likely usable as raw material for production of supercondensers. Sewage sludge neutralization system consists of dosing system (fuel tank), gasifi...
Article
Full-text available
Amorphous carbon electrodes were deposited using atmospheric pressure plasma torch from the mixture of argon and acetylene gases on the stainless steel substrates. The ratio of Ar/C2H2 was in the range of 15-55. The deposited coatings were immersed in low pressure oxygen plasma for 1 min. Scanning electron microscopy images show that when Ar/C2H2 r...
Article
Full-text available
Diagnostic methods used for atmospheric pressure thermal arc plasmas are presented in this paper. An experimental direct current arc plasma torch was used as a source for plasma generation at atmospheric pressure. Overheated water vapor was employed as a plasma-forming gas with an admixture of argon as a shielding gas. A couple of plasma diagnostic...
Article
The carbon and nickel oxide/carbon composite electrodes were prepared by plasma jet and magnetron sputtering techniques. The investigations were performed to evaluate the influence of the Ar/C2H2 ratio on the specific capacitance values of carbon and NiO/carbon electrodes. The obtained electrodes were investigated by scanning electron microscopy, R...
Article
Full-text available
In the present work, the atmospheric pressure plasma jet and magnetron sputtering deposition technology was used for the fabrication of supercapacitor electrodes. It was shown that the parameters of supercapacitors strongly depend on the secondary carbon layer thickness. The increase of the carbon layer thickness from 1 to 2 μm, the relative oxygen...
Article
Full-text available
Amorphous carbon and NiO/carbon composites were used as an electrode material for supercapacitors. The investigations were performed to evaluate the influence of the Ar/C 2 H 2 ratio on the capacitance values of carbon and NiO/carbon electrodes. The surface morphology of the carbon electrodes changes from snowflake-like to columnar with the increas...
Article
Full-text available
Simulation of the temperature distribution on space vehicles surfaces during its reentry phase is most important for assessing its landing safety. Recently composite materials, produced from high temperature resistance composites are under intensive investigations as surface protective shell for space vehicles during its reentry phases into the atm...
Article
Full-text available
In this study a carbon and NiO/carbon electrodes were prepared and investigated. The surface roughness increases with the increase of the torch power. The addition of the NiO changes the surface structure from a snowflake-like to a mesh-like. It was demonstrated that the addition of the nickel oxide to amorphous carbon increases the specific capaci...
Article
A carbon/nickel oxide composite capacitors were made using arc plasma jet and magnetron sputtering deposition techniques. Carbon coatings were deposited on stainless steel substrates at atmospheric pressure from argon-acetylene gases mixture by plasma jet chemical vapor deposition. Nickel oxide (NiO2) layer was formed on the carbon coating employin...
Article
Full-text available
Carbon electrode materials for electric double-layer supercapacltors have been Investigated. A technology of atmospheric plasma torch In the mixture of C2H2+Ar gases was used for the deposition of 200-300 μm thick coatings of activated carbon with a high effective surface area on the surface of stainless steel 1X18H9T substrates. The ratio of Ar/C...
Article
The paper describes a process for preparation of yttria stabilized zirconia (YSZ) coatings by plasma spray technique employing non-equilibrium plasma spray technology at atmospheric pressure. Yttria-stabilized zirconia (10-15 wt. % Y(2)O(3)) powders (10-105 mu m in diameter) have been used. Plasma sprayed coatings have been characterized using scan...
Article
The power and energy-storage capabilities of supercapacitors are closely linked to the physical and chemical characteristics of the carbon electrodes. In the present work, the surfaces of activated carbon electrodes were treated in low pressure oxygen and argon plasma for selected times of 15, 30, 60, 120, 180 and 300 s. The plasma source was a DC...

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