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

IF 1.4 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY AIMS Materials Science Pub Date : 2023-01-01 DOI:10.3934/matersci.2023030
M. Skakov, V. Baklanov, G. Zhanbolatova, A. Miniyazov, I. Sokolov, Yernat Kozhakhmetov, T. Tulenbergenov, Nuriya Mukhamedova, O. Bukina, A. Gradoboev
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引用次数: 1

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).
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再结晶退火对束流等离子放电中钨表面渗碳的影响
选择钨作为ITER转流器的等离子体表面材料(PFM)。然而,石墨和碳石墨材料在一些研究热核设施中用作PFM,包括哈萨克斯坦材料科学托卡马克。这种情况决定了继续研究等离子体辐照下混合层形成的兴趣。本文研究了在束等离子体放电(BPD)中,预再结晶退火对钨表面渗碳的影响。束等离子体放电是模拟托卡马克外围等离子体的一种方法。采用电子束直接加热钨样品的方式,对钨样品进行了初步等时和等温退火实验。退火后的钨样品在BPD的甲烷气氛中,在1000℃的温度下,持续3600 s。利用光学显微镜(OM)和x射线衍射分析了钨表面的结构。结果表明,再结晶退火过程中产生的结构差异影响了钨近表面碳原子的转移和碳化钨(WC或W2C)的形成。
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来源期刊
AIMS Materials Science
AIMS Materials Science MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
0.00%
发文量
33
审稿时长
4 weeks
期刊介绍: AIMS Materials Science welcomes, but not limited to, the papers from the following topics: · Biological materials · Ceramics · Composite materials · Magnetic materials · Medical implant materials · New properties of materials · Nanoscience and nanotechnology · Polymers · Thin films.
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