Impact of High-Power Heat Load and W Surface Carbidization on Its Structural-Phase Composition and Properties

Skakov, Маzhyn; Zhanbolatova, Gainiya; Miniyazov, Arman; Tulenbergenov, Timur; Соколов, И. А.; Sapatayev, Yerzhan; Kozhakhmetov, Yernat; Bukina, Olga

doi:10.1080/15361055.2020.1843885

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…The experiments were conducted within the temperature range from 700 °C to 1700 °C with a pitch of 100 °C with an irradiation for 1 h. The choice of this range is due to the calculation of the temperature distribution in the monoblock element carried out in [22] taking into account the uniform thermal load on the side of the surface W facing the plasma according to the initial data on the thermal power in the ITER. The choice of a constant value for the duration of irradiation was based on the results of experiments carried out earlier in [22][23][24].…”

Section: Methodsmentioning

confidence: 99%

Study of the temperature dependence of a carbidized layer formation on the tungsten surface under plasma irradiation

Baklanov

Zhanbolatova

Skakov

et al. 2022

Mater. Res. Express

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The paper considers a method of tungsten surface carbidization using a beam-plasma discharge (BPD), which was implemented in a plasma-beam installation (PBI). The advantage of this method is to create conditions for chemical reactions and physical processes as close as possible to those possible in thermonuclear installations. The BPD makes it possible to generate plasma using different working gases. Methane was used as a plasma-forming gas. The working gas pressure in a chamber was (1,3-1,4)·10-1 Pa. The temperature dependence of the carbidized layer formation on the tungsten surface under plasma irradiation was determined in the temperature range of 700-1700 °C. The formation of tungsten carbides in surface layers was confirmed by SEM and X-ray diffraction analysis. It was found that interaction between tungsten and methane in a wide temperature range can proceed with simultaneous or sequential formation of the carbide phases W2C and WC.

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Section: Methodsmentioning

confidence: 99%

Study of the temperature dependence of a carbidized layer formation on the tungsten surface under plasma irradiation

Baklanov

Zhanbolatova

Skakov

et al. 2022

Mater. Res. Express

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“…Earlier, we carried out work on modeling the thermal load on plasma-converted tungsten under the conditions of ITER regular operation [ 38 ]. Based on the simulation results, the temperature values for plasma irradiation were calculated to simulate a thermal load corresponding to heat flows in ITER, which was 905 °C (corresponds to ~10 MW/m 2 stationary) and 1750 °C (corresponds to ~20 MW/m 2 pulsed).…”

Section: Experimental Partmentioning

confidence: 99%

“…The impact power of the plasma-beam discharge varied depending on the calculated temperature of the tungsten surface, as described above [ 38 ]. The ion current on the sample was measured by an ammeter of the power supply, which provided a potential supply of minus 2000 V. The current density was determined by placing the diaphragm in front of the target node with an aperture with a diameter of 10 mm.…”

Section: Experimental Partmentioning

confidence: 99%

Influence of the Carbidized Tungsten Surface on the Processes of Interaction with Helium Plasma

et al. 2022

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This paper presents the results of experimental studies of the interaction of helium plasma with a near-surface tungsten carbide layer. The experiments were implemented at the plasma-beam installation. The helium plasma loading conditions were close to those expected in the ITER divertor. The technology of the plasma irradiation was applied in a stationary type linear accelerator. The impact of the helium plasma was realized in the course of the experiment with the temperatures of ~905 °C and ~1750 °C, which were calculated by simulating heat loading on a tungsten monoblock of the ITER divertor under the plasma irradiation at the load of 10 MW/m2 and 20 MW/m2, respectively. The structure was investigated with scanning microscopy, transmitting electron microscopy and X-ray analysis. The data were obtained showing that the surface morphology changed due to the erosion. It was found that the carbidization extremely impacted the plasma–tungsten interaction, as the plasma–tungsten interaction with the carbide layer led to the carbon sputtering and partial diffusion towards to the depth of the sample. According to these results, WC-based tungsten carbide is less protected against fracture by helium than W and W2C. An increase in temperature leads to much more extensive surface damage accompanied by the formation of molten and recrystallized flanges.

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“…Materials science studies conducted as part of the implementation of international programs for the creation of fusion reactors ITER and DEMO have shown that one of the best materials for use as an PFM (plasma-facing material) [1] in controlled fusion plants is liquid lithium and materials based on it [2,3,4]. The use of liquid lithium as a plasma-facing material is especially promising if lithium is enclosed in a so-called capillary-porous system (CPS) [5,6].Currently, there are many studies in the world conducted with lithium CPS, which once again confirms the interest in this material [7,8,9,10,11,12,13].Work on this topic is also being carried out at the Kazakhstan Materials Science Tokamak KTM [14,15,16,17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Tests of lithium CPS on basis of carboxylic fabric, reinforced with carbon nanotubes under high thermal and radiation loads

Tulubayev

Ponkratov

Baklanov

et al. 2022

J. Phys.: Conf. Ser.

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This work is devoted to testing a lithium CPS based on carbon fabric reinforced with carbon nanotubes under conditions of thermal and radiation loads. The paper considers and analyzes: the properties of carbon nanotubes and methods of their synthesis, the nature of the interaction of carbon materials with liquid lithium at different temperatures. A description of all the main stages in the manufacture of lithium CPS based on carbon fabric reinforced with carbon nanotubes is given. Microstructural studies of a manufactured lithium CPS sample based on carbon fabric reinforced with carbon nanotubes are presented. Studies have shown that a carbon fabric with a fiber surface reinforced with carbon nanotubes is completely wetted by liquid lithium. The developed technology is fully suitable for the manufacture of lithium CPS samples for further research. The results of experiments on the interaction of lithium CPS based on graphite fabric reinforced with carbon nanotubes with hydrogen isotopes under thermal and radiation loads are presented.

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Impact of High-Power Heat Load and W Surface Carbidization on Its Structural-Phase Composition and Properties

Cited by 10 publications

References 14 publications

Study of the temperature dependence of a carbidized layer formation on the tungsten surface under plasma irradiation

Study of the temperature dependence of a carbidized layer formation on the tungsten surface under plasma irradiation

Influence of the Carbidized Tungsten Surface on the Processes of Interaction with Helium Plasma

Tests of lithium CPS on basis of carboxylic fabric, reinforced with carbon nanotubes under high thermal and radiation loads

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