The operating experience of axial single-wheels indicates the need to protect the blades from erosion damage. This can be achieved by applying a protective coating. We have proposed a method for ...processing bladed disk by biaxial rotation in a vacuum volume. The selection of the trajectory is supposed to be carried out using numerical simulation methods. An important parameter in this case is the smoothed variable to eliminate noise from the coating thickness. The article presents the selection of this parameter based on an experiment with samples of various forms with a protective coating of the (Ti-V)N system.
To resolve the problem of the connectedness of the territory of the Russian Federation we need the implementation of scientific and technological solutions, for the development and implementation of ...which we form complex scientific and technical programs and complex projects of the full innovation cycle. To effectively solve the problems of spatial development of the regions of the Russian Federation, it is necessary to introduce new technologies to ensure energy, transport, information and socio-cultural connectivity of sparsely populated and hard-to-reach territories. Information connectivity of the territory can be ensured through the creation and use of information and analytical systems for remote monitoring of objects and resources on the territory of the state.
Abstract
The results of experiments on the study of plasma compression of nested wire arrays of mixed composition and the generation of powerful pulses of soft x-ray radiation (SXR), carried out on a ...pulse power facility Angara-5-1 at a current level of up to 3 MA, are presented. Based on the latest experimental data on the intensity of plasma formation of various substances
m
˙
(in
μ
g(cm
2
ns)
−1
) (Mitrofanov
et al
2020
Plasma Phys. Rep.
46
1150–80) and on the features of the dynamics of plasma compression in nested arrays (Mitrofanov
et al
2018
Plasma Phys. Rep.
44
203–35), a nested wire array design has been developed which makes it possible to obtain a high peak SXR power in comparison with the known designs of single and nested tungsten wire arrays. During the implosion of nested arrays of mixed composition, consisting of plastic fibers and tungsten wires, shorter and more powerful SXR pulses were obtained with a maximum peak power
P
SXR
max
∼ 10 TW with a full width at half maximum (FWHM) duration of ∼5 ns compared to the parameters of SXR pulses upon compression of single tungsten arrays:
P
SXR
max
∼ 5 TW and FWHM ∼ 10 ns. Thus, under the conditions of our experiments, we have shown the possibility of a twofold increase in the peak SXR power during compression of nested arrays by optimizing their design.
When applying a vacuum-arc discharge plasma coating to profilecomposite items, such as twin turbine blades, unicycle blades, etc., a problem might occur with ensuring the tolerance on the coating ...thickness. This article presents the obtained dependence of the nonuniformity of the coating thickness on the geometric parameters of the inter-blade channel—its length and width. We develop a simulation model for calculating the distribution of the thickness of the vacuum-arc discharge plasma coating for the profilecomposite parts having shadow zones.
A digital model of a grazing-incidence X-ray spectrograph and methods for reconstruction of soft X-ray spectra of a Z-pinch plasma at the Angara-5-1 facility in the 2–40 nm range have been developed. ...The main problems hindering reliable qualitative and quantitative reconstruction of the initial Z-pinch X-ray spectra are the superposition of signals from different diffraction orders and the complex form of the device instrumental function. Two techniques for reconstructing the spectrum are presented. In the first one, a digital model of the spectrograph was developed in the Geant4 Monte Carlo simulation toolkit, taking into account the geometry of the experiment and the processes of interaction of X-ray radiation with a diffraction grating. In this model, taking into account the specific shape of the groove profile of the diffraction grating and the differential method for solving the diffraction problem, the X-ray intensity distribution in different diffraction orders depending on the wavelength is calculated. Using the developed model of the spectrograph, its instrumental function was calculated. The second technique does not use a specific grating groove shape, but, based on the analysis of calibration spectrograms, it constructs a dispersion relation and allows one to reconstruct the spectrum. At the end of the work, the results of reconstruction by the first and second techniques are compared and fairly good agreement between the spectra obtained by different techniques is shown.
X-ray powder diffraction is used to determine the unit cell parameters and to refine the crystal structure of the solid solutions of
M
-type hexagonal barium ferrite BaFe
12–
x
Ga
x
O
19
(
x
= ...0.1–1.2) with isostructural diamagnetic cation Ga
3+
substitution at
T
= 300 K. As the level of substitution increases, the unit cell parameters are shown to decrease monotonically. The temperature (300 K ≤
T
≤ 750 K,
H
= 8.6 kOe) and field (
T
= 300 K,–20 kOe ≤
H
≤ 20 kOe) dependences of the saturation magnetization of these solid solutions are studied with a vibrating-sample magnetometer. The concentration dependences of the Curie temperature
T
C
, the specific spontaneous magnetization, and the coercive force are plotted. The magnetic parameters are found to decrease with increasing substitution. The microwave properties of the solid solutions are analyzed in an external magnetic field (0 ≤
H
≤ 4 kOe). As the cation Ga
3+
concentration increases from
x
= 0.1 to 0.6, the natural ferromagnetic resonance (NFMR) frequency decreases; as the concentration increases further to
x
= 1.2, this frequency again increases. As the cation Ga
3+
concentration increases, the NFMR line width increases, which indicates a widening of the frequency range where electromagnetic radiation is intensely absorbed. Here, the resonance curve peak amplitude changes insignificantly. The shift of the NFMR frequency in an applied magnetic field is more pronounced for samples with low cation Ga
3+
concentrations. The role of diamagnetic substitution is revealed, and the prospects and advantages of Ga-substituted beryllium hexaferrite as the material absorbing high-frequency electromagnetic radiation are demonstrated.
Description of modern pyroelectric technologies is presented in this article. Various schemes for generating X-ray radiation are presented. The possibility of controlling charged particle beams by ...means of a pyroelectric deflector is demonstrated. The prospects for the development of pyroelectric technologies and their application are discussed.
Cathodic arc deposition of coatings onto the surface of products with a complex geometry (coupled turbine blades, integrally bladed disks) can be complicated by the problem of the coating thickness ...tolerance. This paper suggests experimental dependences between nonuniformity of the coating thickness synthesized by cathodic arc deposition and geometrical parameters of the blade channel, namely its length, width, and curvature radius.
Spectral properties of the high-temperature plasma obtained by exposing a nickel layer to a source of high-power X-ray radiation (a power of 6–10 TW with a duration of 7–10 ns) based on a Z-pinch, ...formed during implosion of tungsten multi-wire arrays at the Angara-5-1 facility, are studied. In this case, the Z‑pinch radiation heats the target and turns it into the hot plasma, and the same radiation probes the target plasma to determine the spectral dependence of the transmission of this plasma. An original scheme is proposed for measuring the incident, transmitted and self-emission of a target simultaneously in one experiment in the frame mode using a grazing incidence diffraction spectrograph. Using laser shadow imaging, experimental data are obtained on the velocity of the plasma expansion on the irradiated and back sides of the target, which reached 100 km/s. Targets made of thin Ni layers deposited on a mylar film are studied. An irradiation-induced multiple increase in the transmission of the target plasma in the EUV range is observed compared to the transmittance of the target in the cold state. The dependence of the absorption spectrum of the plasma and the accompanying self-radiation of the target on the power and shape of the heating pulse is studied. The measurement results are compared with numerical calculations performed using the RALEF-2D two-dimensional radiation code, which has been repeatedly used previously to simulate similar experiments. The shape of the spectral dependence of the transmission in the experiment and calculation is similar in the range of ∼30–200 Å, but the model plasma transmission (∼0.8–0.9) is higher than that obtained using a spectrograph and X-ray multi-frame photography (∼0.5–0.6).
Experiments aimed at investigation of X-ray self-emission of plasma of heated targets consisting of layers of different materials (Mylar, polypropylene, In, Sn, and Au) exposed to the action of ...energy flux of X‑ray radiation (the so-called energy exposure of the target) of up to 10 kJ/cm
2
were carried out. A Z-pinch induced by implosion of a tungsten wire-array by current of up to 4 MA in Angara-5-1 facility was used as a source of high-power X-ray radiation. The temporal dynamics of intensity of self-emission of heated targets was studied. In the process, contribution of expanding layer of a material with high atomic number
Z
to self-emission of the target dominates that of a Mylar film with effective charge
Z
eff
≈ 4.5. It is demonstrated that the 1/
e
decay time of target emission depends on expansion dynamics of target plasma. The latter, in turn, depends on orientation of the layer characterized by high atomic number relative to the source of radiation. New data on spectral composition of self-emission of targets and its changes with time is obtained. This data is compared with the results of numerical simulation of target heating and scatter by means of RALEF-2D two-dimensional radiation gas-dynamic code.
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