Abstract
Part of the First Wall of the conceptual design of the Next European Torus NET consists of radiation cooled carbon tiles. The tile temperature is determined by the optical properties of the facing surfaces. The heat transfer to the 316 stainless steel structure can be improved by applying a high emissivity coating. For this purpose ceramic coatings can be applied. This paper deals with the development and characterization of atmospheric and vacuum plasma sprayed titanium carbide as high emissivity coatings. Microstructural evaluation of these coatings includes X-ray diffraction and light microscopy of cross-sections. The total emissivities of vacuum and atmospheric plasma sprayed TiC coatings were measured at 525 K. Reflection measurements were performed using a YAG laser with a wavelength of 1.06 μm at room temperature. The effects of compositional differences on optical properties are discussed.
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