Nuclear Engineering and Technology

  • 제54권12호
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  • Pages.4491-4498
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  • 2022
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Continuous W-Cu functional gradient material from pure W to W-Cu layer prepared by a modified sedimentation method

  • Bangzheng Wei (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Rui Zhou (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Dang Xu (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Ruizhi Chen (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Xinxi Yu (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Pengqi Chen (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Jigui Cheng (School of Materials Science and Engineering, Hefei University of Technology)
  • 투고 : 2022.01.20
  • 심사 : 2022.08.04
  • 발행 : 2022.12.25
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초록

The thermal stress between W plasma-facing material (PFM) and Cu heat sink in fusion reactors can be significantly reduced by using a W-Cu functionally graded material (W-Cu FGM) interlayer. However, there is still considerable stress at the joining interface between W and W-Cu FGM in the W/W-Cu FGM/Cu portions. In this work, we fabricate W skeletons with continuous gradients in porosity by a modified sedimentation method. Sintering densification behavior and pore characteristics of the sedimented W skeletons at different sintering temperatures were investigated. After Cu infiltration, the final W-Cu FGM was obtained. The results indicate that the pore size and porosity in the W skeleton decrease gradually with the increase of sintering temperature, but the increase of skeleton sintering temperature does not reduce the gradient range of composition distribution of the final prepared W-Cu FGM. And W-Cu FGM with composition distribution from pure W to W-20.5wt.% Cu layer across the section was successfully obtained. The thickness of the pure W layer is about one-fifth of the whole sample thickness. In addition, the prepared W-Cu FGM has a relative density of 94.5 % and thermal conductivity of 185 W/(m·K). The W-Cu FGM prepared in this work may provide a good solution to alleviate the thermal stress between W PFM and Cu heat sink in the fusion reactors.

키워드

과제정보

This work was financially supported by the program of the National Natural Science Foundation of China (52004079, 51674095), and the National Key Research and Development Program of China (2022YFE0109700).

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