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- W2002177868 abstract "As a first wall material in nuclear fusion devices, tungsten will interact with carbon and oxygen from the plasma. In this study, we report on the process of thermally induced carbide formation of thin carbon films on polycrystalline tungsten and the influence of oxygen on this process. All investigations are performed using X-ray photoelectron spectroscopy (XPS). Carbon films are supplied through electron beam evaporation of graphite. The carbidization process, monitored during increased substrate temperature, can be divided into four phases. In phase I disordered carbon converts into graphite-like carbon. In phase II significant diffusion and the reaction to W2C is observed, followed by phase III which is dominated by the presence of W2C and the beginning reaction to WC. Finally in phase IV only WC is present, but the total carbon amount has strongly decreased. Different mechanisms of oxygen influence on the carbide formation are proposed and measurements of the reaction of carbon on tungsten with intermediate oxide layers are presented in detail. A WO2+x intermediate layer completely inhibits the carbide formation, while a WO2 layer leads to WC formation at temperatures above 1270 K." @default.
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- W2002177868 date "2001-03-01" @default.
- W2002177868 modified "2023-09-27" @default.
- W2002177868 title "Influence of oxygen on the carbide formation on tungsten" @default.
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- W2002177868 doi "https://doi.org/10.1016/s0022-3115(00)00429-3" @default.
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