Development of Tungsten Repair Technology by Atmospheric  Plasma Spraying of Tungsten and Friction Stir Processing

Phuangphaga Daram; Yoshiaki Morisada; Takuya Ogura; Masahiro Kusano; JuHyeon Yu; Makoto Fukuda; Hidetoshi Fujii; Seiji Kuroda; Makoto Watanabe

doi:10.1007/s11666-024-01820-5

論文 Development of Tungsten Repair Technology by Atmospheric Plasma Spraying of Tungsten and Friction Stir Processing

Phuangphaga Daram (Research Center for Structural Materials, National Institute for Materials Science) ; Yoshiaki Morisada (Joining and Welding Research Institute, Osaka University) ; Takuya Ogura (Joining and Welding Research Institute, Osaka University) ; Masahiro Kusano (Research Center for Structural Materials, National Institute for Materials Science) ; JuHyeon Yu (Rokkasho Institutes for Fusion Energy, National Institutes for Quantum Science and Technology) ; Makoto Fukuda (Naka Institutes for Fusion Science and Technology, National Institutes for Quantum Science and Technology) ; Hidetoshi Fujii (Joining and Welding Research Institute, Osaka University) ; Seiji Kuroda (Research Center for Structural Materials, National Institute for Materials Science) ; Makoto Watanabe (Research Center for Structural Materials, National Institute for Materials Science)

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Phuangphaga Daram, Yoshiaki Morisada, Takuya Ogura, Masahiro Kusano, JuHyeon Yu, Makoto Fukuda, Hidetoshi Fujii, Seiji Kuroda, Makoto Watanabe. Development of Tungsten Repair Technology by Atmospheric Plasma Spraying of Tungsten and Friction Stir Processing. Journal of Thermal Spray Technology. 2024, (), . https://doi.org/10.1007/s11666-024-01820-5

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(abstract)

Tungsten (W) has a high melting point, excellent thermal conductivity, and irradiation resistance, making it the most promising plasma facing material for divertors in fusion reactors, which are currently under development. However, since the divertor is exposed to an extremely harsh environment, it is considered necessary to develop suitable and cost-effective repair techniques. In this study, the applicability of the atmospheric plasma spraying (APS) method using a gas shroud as a repair technique for W components was investigated, in particular the possibility of strengthening the repaired part by applying friction stir processing (FSP) as a post-treatment. It was found that the application of a gas shroud can suppress in-flight oxidation to some extent, even when the W is deposited in air. In addition, the FSP treatment reduced grain size and porosity, resulting in an increase in microhardness of approximately 37.5% compared to the base material (W substrate) and 203.5% compared to the as-sprayed material. The gas shroud APS and FSP post-treatments have been shown to have potential as repair techniques for tungsten components in future fusion reactors.

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