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Descripción
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| The operating conditions for highly heat loaded plasma-facing components (PFCs) in future fusion reactors like DEMO will be unlike any encountered in current tokamak experiments. Heat fluxes of up to 20 MW/m² are expected in the divertor region, in combination with substantial fusion neutron irradiation. In this regard, enhancing heat removal capability and mechanical integrity are critical issues for the improvement of divertor PFC performance. The preferred plasma-facing material (PFM) in magnetic confinement fusion devices is tungsten (W) because of its high threshold energy for sputtering by hydrogen isotopes as well as its low retention of tritium within the material. From an engineering point of view, however, W is a difficult material to work with as it is an inherently hard and brittle metal. In this respect, established fabrication technologies for W are a limiting factor directly affecting the design of PFCs. Against this background, additive manufacturing (AM) technologies could prove very beneficial with regard to PFC applications as they offer flexibilities beyond the capabilities of conventional manufacturing methods. In contrast to material removal techniques, the competitive advantage of AM is geometrical freedom as three-dimensional objects are created by means of sequential deposition of layers under computer control. Hence, complex shapes can be fabricated straightforwardly. In this regard, powder bed based selective laser beam melting (LBM) of W is being investigated as a possible and flexible manufacturing technology contributing to the development of advanced PFCs [1]. Especially, the application of additively manufactured W structures for the production of tailored composition W-Cu composites as PFC heat sink materials is regarded as potentially beneficial. The present contribution summarizes the manufacturing and characterization of a novel W product produced by selective LBM. On the one hand, this includes the thermo-mechanical behavior in the temperature range between 25 °C and 1200 °C under a high vacuum atmosphere (10-6 mbar), i.e. hardness, flexural strength, and fracture toughness. On the other hand, its microstructure, and texture were analyzed and quantified using optical and electron microscopy as well as electron back-scattered diffraction (EBSD). [1] A. v. Müller et al., Microstructural investigations of tungsten manufactured by means of laser beam melting, Proceedings of the 6th International Conference on Additive Technologies | |
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Internacional
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Si |
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Nombre congreso
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ICFRM 16, 16th International Conference on Fusion Reactor Materials |
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Tipo de participación
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960 |
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Lugar del congreso
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La Jolla, California, USA |
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Revisores
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Si |
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ISBN o ISSN
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0000000000 |
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DOI
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Fecha inicio congreso
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20/10/2019 |
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Fecha fin congreso
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26/10/2019 |
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Desde la página
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Hasta la página
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Título de las actas
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16th International Conference on Fusion Reactor Materials |