Development of the W/ODS-Cu divertor heat removal component by using the Advanced Multi-Step Brazing (AMSB)

• Project/Area Number: 20H01887
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 14020:Nuclear fusion-related
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Tokitani Masayuki 核融合科学研究所, 研究部, 准教授 (30455208)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000); Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2020: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
• Keywords: 先進的ろう付接合 / ダイバータ / タングステン / 銅合金 / 微細構造解析

Outline of Research at the Start

先進多段階ろう付接合法(AMSB)を用いたダイバータ受熱機器製造技術を確立させる．AMSBは「GlidCop同士」あるいは「GlidCopとGlidCopよりも融点の高い各種金属」に対し，流体漏れのない条件の接合を１つのダイバータ受熱機器製造過程で繰り返し適用可能とした特許技術である．各接合部はろう付の性能をはるかに超えた強靭な品質であることがわかっているが，その接合メカニズムの詳細は不明である．本研究では，まず，接合部の微細構造解析等により接合メカニズムの解明を行い，更なる接合特性改善のための指針を得る．得られた指針を基に，AMSBによる大規模ダイバータ受熱機器の設計・製造技術を確立させる．

Outline of Final Research Achievements

Manufacturing technology for new type of divertor heat removal component with ultra-high heat removal performance was established via "Advanced Multi-Step Brazing (AMSB)". The new component was basically consisted by tungsten (W) armour with oxide dispersion strengthened Cu alloy (ODS-Cu) heat sink.
The new type of divertor heat removal component showed excellent heat removal performance under a steady-state heat loading of 30 MW/m2, in which this heat loading value is far above the initial target value of 20 MW/m2.

Academic Significance and Societal Importance of the Research Achievements

研究代表者が発明した世界初のろう付接合法「先進多段階ろう付接合法(Advanced Multi-Step Brazing: AMSB)」は，核融合炉のダイバータ受熱機器に対する革新的製造技術に位置付けられ，学術的価値の高いものである．一方で，本技術は異分野や産業界で要求される除熱機器の性能向上や高電圧の接点材料への応用に展開できる可能性を秘めている．今後，産学官連携活動を進めていくことで産業界への技術移転に繋がる可能性が期待される．

Research Products

• [Journal Article] Plasma Wall Interaction of New Type of Divertor Heat Removal Component in LHD Fabricated by Advanced Multi-Step Brazing (AMSB) (2023)
  • Author(s): Masayuki Tokitani, Yukinori Hamaji, Yutaka Hiraoka, Yuki Hayashi, Suguru Masuzaki, Hitoshi Tamura, Hiroyuki Noto, Teruya Tanaka, Tatsuya Tsuneyoshi, Yoshiyuki Tsuji, Gen Motojima, Hiromi Hayashi, Takanori Murase, Takeo Muroga, Akio Sagara, Tomohiro Morisaki
  • Journal Title: Fusion Science and Technology Volume: 79 Issue: 6 Pages: 651-661
  • DOI: 10.1080/15361055.2023.2176184
  • Peer Reviewed
• [Journal Article] ろう付の適用事例 先進的ろう付接合法を用いたタングステン／銅合金製超高熱流プラズマ対向機器の開発 (2023)
  • Author(s): 時谷政行
  • Journal Title: ぶれいず (一社)日本溶接協会 ろう部会 Volume: 57 Pages: 39-50
• [Journal Article] Deformation and fracture behaviour, and thermal stability of ODS-Cu/ODS-Cu and SUS/ODS-Cu joints fabricated by advanced brazing technique (2022)
  • Author(s): M. Tokitani, Y. Hamaji, Y. Hiraoka, S. Masuzaki, H. Tamura, H. Noto, T. Tanaka, T. Muroga, A. Sagara, the FFHR Design Group
  • Journal Title: Fusion Engineering and Design Volume: 184 Pages: 113312-113312
  • DOI: 10.1016/j.fusengdes.2022.113312
  • Peer Reviewed
• [Journal Article] Advanced multi-step brazing for fabrication of a divertor heat removal component (2021)
  • Author(s): M. Tokitani, Y. Hamaji, Y. Hiraoka, S. Masuzaki, H. Tamura, H. Noto, T. Tanaka, T. Tsuneyoshi, Y. Tsuji, T. Muroga, A. Sagara, the FFHR Design Group
  • Journal Title: Nuclear Fusion Volume: 61 Issue: 4 Pages: 046016-046016
  • DOI: 10.1088/1741-4326/abdfdb
  • Peer Reviewed / Open Access
• [Journal Article] Application of the Advanced Multi-Step Brazing for fabrication of the high heat flux component (2020)
  • Author(s): Tokitani M.、Hamaji Y.、Hiraoka Y.、Masuzaki S.、Tamura H.、Noto H.、Tanaka T.、Muroga T.、Sagara A.
  • Journal Title: Journal of Nuclear Materials Volume: 538 Pages: 152264-152264
  • DOI: 10.1016/j.jnucmat.2020.152264
  • Peer Reviewed
• [Presentation] Advanced Multi-Step Brazing (AMSB) for fabrication of new type W/ODS-Cu high heat flux component (2023)
  • Author(s): M. Tokitani, Y. Hamaji, Y. Hiraoka, S. Masuzaki, H. Tamura, H. Noto, T. Tanaka, T. Tsuneyoshi, Y. Tsuji, T. Muroga, A. Sagara, the FFHR Design Group, Y. Hayashi, G. Motojima, H. Hayashi, T. Murase, T. Morisaki, the LHD Experiment Group
  • Organizer: 19th International Conference on Plasma-Facing Materials and Components for Fusion Applications (PFMC-19)
  • Int'l Joint Research / Invited
• [Presentation] Irradiation experiment of new type of divertor heat removal component fabricated by AMSB to LHD divertor plasma (2023)
  • Author(s): M. Tokitani, Y. Hamaji, Y. Hiraoka, Y. Hayashi, S. Masuzaki, H. Noto, T. Tsuneyoshi, Y. Tsuji, G. Motojima, H. Hayashi, T. Murase, T. Muroga, T. Morisaki
  • Organizer: Global Plasma Forum in Aomori
  • Int'l Joint Research
• [Presentation] 銅および銅合金の先進的ろう付接合法とその応用 (2023)
  • Author(s): 時谷政行
  • Organizer: 一般社団法人日本溶接協会 2022年度 第3回ろう部会 技術委員会 先端材料接合委員会
• [Presentation] Advanced Multi-Step Brazing (AMSB) for fabrication of the new type W/ODS-Cu plasma facing components (2022)
  • Author(s): M. Tokitani, T. Yamashita, Y. Hamaji, Y. Hiraoka, H. Noto, S. Masuzaki, T. Tsuneyoshi, Y. Tsuji, T. Muroga, S. Shimabukuro, N. Yoshida, H. Idei, K. Kono, M. Oya, T. Onchi, R. Ikezoe
  • Organizer: ISPlasma2022/IC-PLANTS2022
  • Int'l Joint Research
• [Presentation] 銅及び銅合金の先進的ろう付接合法 (2021)
  • Author(s): 時谷政行
  • Organizer: (社)溶接学会 第118回界面接合研究委員会 講演会
• [Presentation] Advanced Multi-Step Brazing (AMSB) for fabrication of the new type W/ODS-Cu divertor heat removal component (2021)
  • Author(s): M. Tokitani, Y. Hamaji, Y. Hiraoka, S. Masuzaki, H. Tamura, H. Noto, T. Tanaka, T. Tsuneyoshi, Y. Tsuji, T. Muroga, A. Sagara, the FFHR Design Group, Y. Hayashi, G. Motojima, H. Hayashi, T. Murase, T. Morisaki, the LHD Experiment Group
  • Organizer: 20th International Conference on Fusion Reactor Materials (ICFRM-20)
  • Int'l Joint Research
• [Presentation] AMSB新構造ダイバータ受熱機器試験体のLHDダイバータプラズマへの照射試験 (2021)
  • Author(s): 時谷政行，浜地志憲，平岡 裕，増崎 貴，田村 仁，能登裕之，田中照也，恒吉達矢，辻 義之，室賀健夫，相良明男，FFHR設計グループ
  • Organizer: 第38回プラズマ・核融合学会年会
• [Presentation] 先進多段階ろう付接合法(AMSB)によるダイバータ受熱機器の開発 (2020)
  • Author(s): 時谷政行，浜地志憲，平岡 裕，増崎 貴，田村 仁，能登裕之，田中照也， 恒吉達矢，辻 義之，室賀健夫，相良明男，FFHR設計グループ
  • Organizer: 日本原子力学会 2020年秋の年会
• [Presentation] Deformation/fracture behavior and thermal stability of ODS-Cu/ODS-Cu and SUS/ODS-Cu joint fabricated by the advanced brazing technique (2020)
  • Author(s): M. Tokitani, Y. Hamaji, Y. Hiraoka, S. Masuzaki, H. Tamura, H. Noto, T. Tanaka, T. Muroga, A. Sagara, the FFHR Design Group
  • Organizer: 30th Symposium on Fusion Technology (SOFT2020)
  • Int'l Joint Research
• [Presentation] 先進的ろう付接合法によるODS-Cu/ODS-CuおよびSUS/ODS-Cu接合部の変形・破断挙動および熱的安定性 (2020)
  • Author(s): 時谷政行，浜地志憲，平岡 裕，増崎 貴，田村 仁，能登裕之，田中照也， 恒吉達矢，辻 義之，室賀健夫，相良明男，FFHR設計グループ
  • Organizer: 第37回 プラズマ・核融合学会年会
• [Patent(Industrial Property Rights)] 銅および銅合金のろう付接合方法 (2020)
  • Inventor(s): 時谷政行
  • Industrial Property Rights Holder: 自然科学研究機構
  • Industrial Property Rights Type: 特許
  • Filing Date: 2020
  • Acquisition Date: 2021