Investigation of tungsten surface carbidization under plasma irradiation

Miniyazov, Arman; Skakov, Маzhyn; Tulenbergenov, Timur; Соколов, И. А.; Zhanbolatova, Gainiya; Bukina, Olga; Kozhahmetov, Ye A

doi:10.1088/1742-6596/2064/1/012053

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…In accordance with the method previously developed by us [ 36 ], the carbide surface layers were obtained in the form of WC tungsten carbide and W 2 C tungsten semi-carbide. The results of the tungsten carbidization process studies are described in [ 35 , 37 ].…”

Section: Methodsmentioning

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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Section: Methodsmentioning

confidence: 99%

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

et al. 2022

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The effect of recrystallization annealing on the tungsten surface carbidization in a beam plasma discharge

et al. 2023

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<abstract> Tungsten was chosen as the plasma facing material (PFM) of the ITER divertor. However, graphite and carbon-graphite materials are used as PFM in some research thermonuclear facilities, including the Kazakhstan materials science tokamak. This circumstance determines the interest in continuing the study of the formation of mixed layers under plasma irradiation. This article is devoted to the study of the effect of preliminary recrystallization annealing on the carbidization of the tungsten surface in a beam-plasma discharge (BPD), which is one of the ways to simulate the peripheral plasma of a tokamak. Experiments on preliminary isochoric and isothermal annealing of tungsten samples were carried out in the mode of direct heating of tungsten samples by an electron beam. The carbidization of tungsten samples after annealing was carried out in a methane atmosphere in the BPD at a temperature of 1000 ℃ for a duration of 3600 s. Optical microscopy (OM) and X-ray diffraction were used to analyze the structure of the tungsten surface. It has been established that differences in the structure arising during recrystallization annealing affect the transfer of carbon atoms in the near-surface area of tungsten and the formation of tungsten carbides (WC or W2C). </abstract>

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Influence of helium plasma on the structural state of the surface carbide layer of tungsten

Skakov,

Miniyazov,

Baklanov

et al. 2023

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<abstract> This paper presents the results of the experimental studies of the helium plasma interaction with a surface carbide layer of tungsten. The experiments were carried out on a plasma beam installation (PBI) at a constant energy of incoming ions of 2 keV and at a surface temperature of the tungsten carbide layer of ~905 and ~1750 ℃. The local parameters (Te, n0) of the helium plasma were evaluated using the probe method and spectrometric analysis of the plasma composition. The helium plasma irradiated two types of the carbide layer on the tungsten surface, WC and W2C. The mechanisms of changing the tungsten surface morphology in the result of the plasma irradiation have been described. The study of the surface structure of the tungsten samples with a carbide layer of two types (WC, W2C) after the exposure to the helium plasma has revealed two different types of the formation of helium bubbles and changes in the surface morphology. The physical mechanism of the formation of helium bubbles consists in the capture of helium atoms by the thermal vacancies generated at high temperature by the material surface. However, with a significant increase in temperature to 1750 ℃, the formation of the bubbles was no longer observed and the sample surface had a developed coral-like structure with crystallographically oriented grains. </abstract>

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Investigation of tungsten surface carbidization under plasma irradiation

Cited by 4 publications

References 7 publications

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

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

The effect of recrystallization annealing on the tungsten surface carbidization in a beam plasma discharge

Influence of helium plasma on the structural state of the surface carbide layer of tungsten

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