Manufacturing and testing of flat-type divertor mockup with advanced materials

Mou Nanyu; Zhang Xiyang; Lin Qianqian; Yang Xianke; Han Le; Cao Lei; Yao Damao

doi:10.1016/j.net.2023.03.027

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자료유형: 학술저널

저자정보: Mou Nanyu (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Zhang Xiyang (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Lin Qianqian (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Yang Xianke (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Han Le (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Cao Lei (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Yao Damao (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제55권 제6호

발행연도: 2023.6

수록면: 2,139 - 2,146 (8page)

DOI: 10.1016/j.net.2023.03.027

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During reactor operation, the divertor must withstand unprecedented simultaneous high heat fluxes and high-energy neutron irradiation. The extremely severe service environment of the divertor imposes a huge challenge to the bonding quality of divertor joints, i.e., the joints must withstand thermal, me chanical and neutron loads, as well as cyclic mode of operation. In this paper, potassium-doped tungsten (KW) is selected as the plasma facing material (PFM), oxygen-free copper (OFC) as the interlayer, oxide dispersion strengthened copper (ODS-Cu) alloy as the heat sink material, and reduced activation ferritic/ martensitic (RAFM) steel as the structural material. In this study, a vacuum brazing technology is pro posed and optimized to bond Cu and ODS-Cu alloy with the silver-free brazing material CuSnTi. The most appropriate brazing parameters are a brazing temperature of 940 C and a holding time of 15 min. High quality bonding interfaces have been successfully obtained by vacuum brazing technology, and the average shear strength of the as-obtained KW/Cu and ODS-Cu alloy joints is ~268 MPa. And a fabrication route for manufacturing the flat-type divertor target based on brazing technology is set. For evaluating the reliability of the fabrication technologies under the reactor relevant condition, the high heat flux test at 20 MW/m2 for the as-manufactured flat-type KW/Cu/ODS-Cu/RAFM mockup is carried out by using the Electron-beam Material testing Scenario (EMS-60) with water cooling. This paper reports the improved vacuum brazing technology to connect Cu to ODS-Cu alloy and summarizes the production route, high heat flux (HHF) test, the pre and post non-destructive examination, and the surface results of the flat-type KW/Cu/ODS-Cu/RAFM mockup after the HHF test. The test results demonstrate that the mockup manufactured according to the fabrication route still have structural and interfacial integrity under cyclic high heat loads

#Fusion reactor #Divertor #Brazing technology #High heat flux test #Fabrication route #20MW/m2

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Mou Nanyu

소속기관 Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences