Kinetics of carbide formation in the molybdenum-tungsten coatings used in the ITER- like Wall
نویسندگان
چکیده
The kinetics of tungsten carbide formation was investigated for tungsten coatings on CFC with a molybdenum interlayer as they are used in the ITER-like Wall in JET. The coatings were produced by combined magnetron sputtering and ion implantation. The investigation was performed by preparing focused ion beam cross sections from samples after a heat treatment in argon atmosphere. Baking of the samples was done at temperatures of 1100°C, 1200°C, and 1350°C for hold times between 30 minutes and 20 hours. It was found that the data can be well described by a diffusional random walk with a thermally activated diffusion process. The activation energy was determined to be (3.340.11) eV. Predictions for the isothermal lifetime of this coating system were computed from this information.
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