Audrius Žunda

Audrius Žunda
Lithuanian University of Agriculture · Power and Transport Engineering Institute

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14
Publications
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51
Citations

Publications

Publications (14)
Article
Adhesion of Nb thin film to Cu substrate and size of Nb crystal grains for RF cavities were studied depending on laser intensity and dose. Structures of Nb/Cu, obtained by magnetron sputtering with 500 ˚C (Nr.1) and 700 ˚C (Nr.2) deposition temperature, were irradiated by pulsed Nd:YAG laser. Four areas, irradiated with doses D1=5.6x10²⁰, D2=8.8x10...
Article
Ecologically clean lubricants as well as bio-based lubricating grease with nanoparticle and other additives belonging to the new class of “green lubricants” are studied. The results of tallow-based lubricant composites modified by functional additives and nanoparticles of thermally expanded graphite and graphene are presented. Improvement of tribot...
Article
Investigations presented in this paper were carried out using an originally designed rotary piezoelectric motor of a standing wave tribotester. Test conditions, such as the normal force value in the friction pair, the rotor stop torque value, and the test duration can be programmed and changed in a desirable mode. The rotation speed, covered distan...
Article
Piezoelectric micro-engines (PEA) are used in precise positioning equipment in medical, measurement applications, space engineering etc. Tribological processes in the friction contacts of such actuators are very important because efficiency of PEA friction pairs is influenced by roughness and hardness of the surfaces. Studies indicate that friction...
Article
The generation of micro- and nanoparticles using laser cutting of steel strips of the thickness of 0.2–0.6 mm and the separation of particles according to their size were studied. Under optimal cutting conditions (laser power, gas pressure before the nozzle), the cutting quality is good when a small amount of fully oxidized erosion products at the...
Article
Full-text available
Presently strickt World and European environ-mental requirements made force on research, manufacture and use of environmentally friendly lubricants. Scientists lucking for the ways to reduce harm of lubricants to envi-ronment and the cost of lubricants too. Both these prob-lems can be solved using efficient natural lubricating mate-rials. In curren...
Article
One of the primary nanoparticles production methods is electric explosion of wire (further — EEW) which is known as a physical phenomenon since 1771. Limitation of EEW as a method of nanoparticles production lies in a great dispersion of particle diameters — a spectrum of nano- and micrometric diameters (103 and higher differences in diameters are...
Article
The aim of the research is tribological analysis of the running-in of friction pairs with copper coats made by electro-impulsive spraying (EPS) and estimation of the formation possibility of the selective transfer phenomenon (STP) in such friction pairs. Research results have shown that friction pairs with an EPS coat operate at a much lower fricti...
Article
Full-text available
The paper presents experimental results of the structural and tribological characteristics of various zirconia and alumina based ceramic coatings. Ceramic coatings with the thickness up to 60 μm were prepared by plasma-spray technique on the titanium steel substrates employing non-equilibrium plasma spray technology at atmospheric pressure. The eff...
Article
The paper presents experimental results of the structural and tribological characteristics of various zirconia and alumina based ceramic coatings. Ceramic coatings with the thickness up to 60 μm were prepared by plasma-spray technique on the titanium steel substrates employing non-equilibrium plasma spray technology at atmospheric pressure. The eff...
Article
Nanostructured ZnO films were deposited on glass, quartz and Al on silicon mono-crystal Si (100) substrates by using the wire explosion technique. The growth process, structure and photoluminescence (PL) properties were studied by X-ray diffraction (XRD), UV–VIS spectroscopy, scanning electron (SEM) and atomic force microscopy (AFM) and photolumine...
Article
Full-text available
This paper reviews plasma deposition method of zirconia based ceramic coatings with regard to tribological applications. Subjects discussed include wear-resistant coatings from yttria-stabilized zirconia (YSZ) processed by plasma-spray technique on the stainless steel substrates employing non-equilibrium plasma spray technology at atmospheric press...
Article
Full-text available
The paper deals with the investigation on friction couples sharing one composite surface. The composite friction surface consists of steel 45 and electropulse sprayed brass Л63 coating segments. The investigation objective is to determine the extent of the influence of the ratio of steel to brass coatings areas on the selective transfer effect in t...

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