D. Yu. Gerasimov

Studies of multiple and frequency operation of a coaxial magnetoplasma accelerator for production of superhard nanodispersed titanium compounds

It is demonstrated that a system based on coaxial magnetoplasma accelerator facilitates dynamic synthesis of nanodispersed titanium crystalline phases, such as cTiN and TiO2, during multiple use of a titanium barrel as a consumable material. The efficiency of material yield from the surface of the accelerating channel of a titanium barrel increases upon cyclic operation of an accelerator with duration of currentless pause less than 1.0 s.

Electroerosive wear of the barrel of a coaxial hybrid magnetoplasma accelerator in the acceleration of solids

The main regularities of electroerosive wear of the barrel of a hybrid coaxial magnetoplasma accelerator in the acceleration of solids are studied. In order to significantly reduce the erosive wear of the barrel without changing the dynamics of solid projectiles, a system of discharge shunting in the acceleration channel was used. It is shown that the plasma structure of a high-current arc discharge is fountain-shaped and its bridge consists of numerous discrete conduction channels.

Direct dynamic synthesis of nanodispersed titanium nitride in a high-speed pulse electroerosion plasma jet

A possibility has been shown to produce nanodispersed TiN in a high-speed sputter-ion plasma jet generated by a coaxial magnetoplasma accelerator. The process is implemented in a short-time (∼10−3 s) operating cycle of the accelerator with titanium electrodes. The basic consumable is prepared by electroerosion from the surface of accelerating channel. Depending on the specific supplied energy dissipated in the channel powder particles can have both a spherical and an irregular form and sizes from 10 to 300 nm.

Direct dynamic synthesis of nanodispersed phases of titanium oxides upon sputtering of electrodischarge titanium plasma into an air atmosphere

Experimental investigations of the possibility of directly synthesizing nanodispersed crystalline phases of titanium dioxides with rutile and anatase structures in a hypervelocity jet of electroerosion plasma generated by a coaxial magnetoplasma accelerator with titanium electrodes are presented. A powder product containing nanosized polymorphic phases of titanium dioxide with a spherical shape of particles has been manufactured.

Dependence of Physical, Mechanical, and Structural Properties of TiN Ceramics on Temperature of Spark Plasma Sintering

In this work the dependence of physicomechanical properties of titanium nitride ceramics on the temperature of the spark plasma sintering process is discussed. We study the behavior of the sintering process and find densification variances throughout the whole sintering process. The microstructure of the ceramics is studied and mechanisms of changes in grain structure depending on the sintering temperature are determined. The dependence of hardness of sintered material on sintering temperature is studied, and ceramics with a hardness of 17 GPa are obtained.

Ensuring electromagnetic compatibility of pulse facilities with supply mains

A power-supply three-phase rejection L-shaped LC filter is developed. The filter ensures electromagnetic compatibility of the Impuls facility, which is intended for water purification, with supply mains.

Synthesis of Nanocrystalline Titanium Diboride in a Hypervelocity Plasma Jet

Results of experimental investigations of directly synthesizing nanocrystalline titanium diboride in a hypervelocity jet of electrodischarge plasma generated by a pulse high-current coaxial magnetoplasma accelerator with titanium electrodes are presented. The main result of the investigations is manufacturing a product with a mass of up to ∼3 g containing more than 90% of titanium diboride obtained mostly in the form of hexagonal and dodecagonal particles.

Initiation of an Arc Discharge in a Coaxial Magnetoplasma Accelerator

The results of experiments on the initiation of an arc-discharge-like Z-pinch in a coaxial magnetoplasma accelerator in different ways have been considered. It has been found that, with increasing resistance between the electrodes, the switching voltage increases and the time of arc-discharge ignition decreases. The electrophysical parameters of an arc, such as voltage, discharge current, pulse duration, transferred charge, and input energy, are unaffected by the method of initiation of an arc discharge.

A Study of the Electroerosive Wear of Surfaces of Accelerating Channels of a Coaxial Magnetoplasma Accelerator

Results of experimental studies of electroerosive wear of accelerating channels’ surface of coaxial magneto-plasma accelerator are presented. The main patterns of the accelerating channel electroerosive wear of titanium, stainless-steel, copper, and duralumin coaxial magnetoplasma accelerators (CMPAs) are determined. The optimum length of the accelerating channel in the range of delivered energy in the region of 50 kJ, wherein up to 90% of the material carried out by the hypersonic jet of electroerosion plasma is turned out, are determined. For titanium, stainless steel and duralumin barrels, it is about 150 mm and for a copper one it is 100 mm. The analytic expression allowing one to estimate the required weight value of eroded material with certain energy and structural parameters of CMPA are obtained on the base of experimental studies.

Increase in the Acceleration Efficiency of Solids in a Hybrid Coaxial Magnetoplasma Accelerator

It is shown that in a hybrid coaxial magnetoplasma accelerator with a channel length of 350 mm and a diameter of 23 mm, the acceleration velocity and the energy conversion efficiency increase as the length of the plasma structure formation channel filled with a gas-generating material decreases from 17 to 9 mm. It is found that it is reasonable to use paraffin as the gas-generating material as it has a less significant deionizing effect on the high-current arc discharge and hence causes a less significant decrease in the discharge current intensity and an increase in conductive and inductive electrodynamic forces.