A5051993316- Microwave-Assisted Synthesis and Applications
- Advanced ceramic materials synthesis
- Gyrotron and Vacuum Electronics Research
- Microwave Dielectric Ceramics Synthesis
- Particle accelerators and beam dynamics
- Microwave Engineering and Waveguides
- Advanced materials and composites
- Intermetallics and Advanced Alloy Properties
- Pulsed Power Technology Applications
- Acoustic Wave Resonator Technologies
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Material Properties and Applications
- Epoxy Resin Curing Processes
- Luminescence Properties of Advanced Materials
- Aluminum Alloys Composites Properties
- Chalcogenide Semiconductor Thin Films
- Additive Manufacturing and 3D Printing Technologies
- Thermal and Kinetic Analysis
- Superconducting Materials and Applications
- Photonic and Optical Devices
- High-pressure geophysics and materials
- Nuclear Materials and Properties
- Boron and Carbon Nanomaterials Research
- Laser-Plasma Interactions and Diagnostics
Institute of Applied Physics
2014-2023
Omsk State Agrarian University
2020
A.M. Obukhov Institute of Atmospheric Physics
2017
Russian Academy of Sciences
2004-2015
V. N. Karazin Kharkiv National University
2013
In recent years, a considerable interest has been drawn to microwave heating of powder metals and other electrically conductive materials. this paper consistent formulation describing the absorption microwaves in materials under different conditions is developed. A special case when particles are surrounded by insulating oxide layers investigated detail using effective-medium approximation. The giving rise skin effect governed, volumetric, localized analyzed. Experimental observations...
During the last decade, a line of gyrotrons ranging in frequency from 24 to 84 GHz with output power 3 35 kW continuous wave, and series gyrotron-based systems have been developed by Institute Applied Physics, Nizhny Novgorod, Russia, jointly GYCOM, Ltd., Novgorod. Main technical characteristics gyrotrons, as well architecture millimeter-wave sources for applications are presented. The purposely transmission lines, applicators, control make gyrotron flexible easily adaptable tools research...
The results of a study ultra-rapid (flash) sintering oxide ceramic materials under microwave heating with high absorbed power per unit volume material (10–500 W/cm3) are presented. Ceramic samples various compositions—Al2O3; Y2O3; MgAl2O4; and Yb(LaO)2O3—were sintered using 24 GHz gyrotron system to density above 0.98–0.99 the theoretical value in 0.5–5 min without isothermal hold. An analysis experimental data (microwave power; cooling rates) along microstructure characterization provided...
Temperature gradients that develop in ceramic materials during microwave heating are known to be strongly dependent on the applied frequency. To gain a better understanding of this dependence, identical samples ZnO powder compacts were heated at three distinct widely separated frequencies 2.45, 30, and 83 GHz core surface temperatures simultaneously monitored. At 2.45 GHz, approximately uniform “volumetric” tends raise temperature sample as whole, but interior becomes hotter than exterior...
Yb:(LaY) 2 O 3 ceramic samples have been sintered to almost full density in a fast microwave heating process with zero hold time. Rapid densification is observed at rates ranging from 50°C 2400°C/min. The estimated value of the power absorbed materials per unit volume 10 400 W/cm , which similar processes flash sintering under an applied dc/ac voltage. microstructure exhibits traces liquid‐like intergranular phase. effect associated both preferential absorption and enhanced mass transport...
Heating efficiently solid-density, or even compressed, matter has been a long-sought goal in order to allow investigation of the properties such state interest for various domains, e.g. astrophysics. High-power lasers, pinches, and more recently Free-Electron-Lasers (FELs) have used this respect. Here we show that by using high-power, high-contrast "PEARL" laser (Institute Applied Physics-Russian Academy Science, Nizhny Novgorod, Russia) delivering 7.5 J 60 fs pulse, coupling can be...
Microwave influence on phase transformations in nanostructured alumina has been investigated a comparative study. It found that microwave heating results lower transformation temperature, not affecting other features of the process such as grain size and effect dopant addition. For first time, dependence intensity characterized quantitatively. Unexpectedly, this turns out to be non-monotonic, rate reaches its maximum when moderate-intensity microwaves are used for heating.
Experimental results and design details are presented on an amplifier setup based a helical-waveguide gyrotron traveling-wave tube delivering continuous-wave kilowatt-level output power with instantaneous frequency bandwidth of about 3%.
The possibility of using microwave heating for sintering optical oxide ceramics and the advantages this method are considered. Sintering Yb0.1:(YLa)1.9O3 by with 24-GHz radiation is studied. compacts prepared from nanosized powders obtained high-temperature synthesis acetate-nitrates rare-earth metals. effect addition lanthanum uniaxial pressing conditions on microstructure transmission Lasing at a wavelength 1030 nm an efficiency 7.5 % achieved in ceramic samples (Yb0.05Y0.1La0.85)2O3...
Rapid microwave sintering of different oxide ceramics with heating rates up to 300 °C/min and zero hold time has been implemented using a 24 GHz gyrotron-based system for high-temperature processing materials. The design the system, principle operation, process control are described. Particular attention is given thermal insulation assemblies implementation temperature measurement in an environment intense electromagnetic fields. A description optical dilatometry presented. interrelation...
A 45-GHz gyrotron-based microwave oscillator setup has been purposefully developed for powering of a superconducting electron cyclotron resonance (ECR) ion source. The provides smoothly regulated output power in the 0.1–20-kW range (up to 26 kW manual mode) with an efficiency up 50% and collector depression both continuous wave (CW) pulse modes. Pulse mode specifications: duration 5–200 ms, leading edge less than <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Abstract MgAl 2 O 4 samples were microwave sintered to near‐full density in rapid processes with heating rates on the order of 100°C/min and zero isothermal hold. The experiments carried out using a gyrotron system for processing materials operating at frequency 24 GHz maximum power 6 kW . In regimes preset rate sustained by automatically regulated power, achieved was about 95% theoretical value pristine (maximum sintering temperature 1650°C) 97% 1 wt.% Y 3 ‐doped (1700°C). fixed (about 3.5...