Development of growth technique of shape-controlled crystal for alloy materials with difficult workability

• Project/Area Number: 15H05551
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Metal making/Resorce production engineering
• Research Institution: Tohoku University
• Principal Investigator: Yokota Yuui 東北大学, 未来科学技術共同研究センター, 准教授 (60517671)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000); Fiscal Year 2017: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2016: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2015: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
• Keywords: 一方向凝固 / 難加工性合金 / イリジウム / ルテニウム / 線材 / 合金用マイクロ引き下げ法 / デバイス設計・製造プロセス / 線材作製技術 / 製造プロセス / 線材化プロセス / マイクロ引き下げ法

Outline of Final Research Achievements

Innovative method acceptable for production of Iridium (Ir) and Ruthenium (Ru) metal fibers with high melting point and poor workability is developed using an alloy-micro-pulling-down (A-μ-PD) method and ceramic crucibles with sufficient mechanical and thermal shock resistance. As-grown (as-solidified) Ir and Ru fibers were approximately 1 mm in diameter and their lengths exceed 15 and 0.3 m, respectively. Both Ir and Ru fibers were composed of number of elongated grains oriented along a growth direction which is attributable to the unidirectional solidification. The flexibility and oxidation resistance of the Ir fiber grown by the A-μ-PD method was considerably improved as compared to a commercial Ir wire made by wire-drawing process.

Research Products

• [Journal Article] Fabrication of Metallic Fibers with High Melting Point and Poor Workability by Unidirectional Solidification (2017)
  • Author(s): Yokota Yuui、Nihei Takayuki、Tanaka Kunihiro、Sakairi Koichi、Chani Valery、Ohashi Yuji、Kurosawa Shunsuke、Kamada Kei、Yoshikawa Akira
  • Journal Title: Advanced Engineering Materials Volume: 20 Issue: 3 Pages: 1700506-1700506
  • DOI: 10.1002/adem.201700506
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Growth of platinum fibers using the micro-pulling-down method (2017)
  • Author(s): Nihei Takayuki、Yokota Yuui、Arakawa Mototaka、Ohashi Yuji、Kurosawa Shunsuke、Kamada Kei、Chani Valery、Yoshikawa Akira
  • Journal Title: Journal of Crystal Growth Volume: 468 Pages: 403-406
  • DOI: 10.1016/j.jcrysgro.2016.10.088
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Growth of Co-Cr-Mo Alloy Fiber Crystal by Alloy-Micro-Pulling-Down Method, and the Microstructure and Mechanical Property (2018)
  • Author(s): Yuui Yokota, Takayuki Nihei, Masao Yoshino, Akihiro Yamaji, Yuji Ohashi, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa
  • Organizer: The 21st International Conference on Solid Compounds of Transition Elements (SCTE’18)
  • Int'l Joint Research
• [Presentation] Growth of Iridium and Iridium Alloy Fibers from the Melt by Alloy-micro-pulling-down Method (2018)
  • Author(s): Yuui Yokota, Takayuki Nihei, Yuji Ohashi, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa
  • Organizer: TMS2018 147th Annual Meeting & Exhibition
  • Int'l Joint Research
• [Presentation] Fabrication of metallic fibers with high melting point and poor workability by alloy-micro-pulling-down method (2017)
  • Author(s): Yuui Yokota
  • Organizer: The 7th Asian Conferene on Crystal Growth and Crystal Technology (CGCT-7)
  • Int'l Joint Research / Invited
• [Presentation] Growth, Microstructure and Mechanical Properties of Iridium Fiber Crystal by Alloy-Micro-Pulling-Down Method (2017)
  • Author(s): Yuui Yokota, Takayuki Nihei, Yuji Ohashi, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa
  • Organizer: 21st American Conference on Crystal Growth and Epitaxy (ACCGE-21)
  • Int'l Joint Research
• [Presentation] 一方向凝固によって作製した貴金属線材結晶の組織観察と機械的特性 (2017)
  • Author(s): 横田有為、二瓶貴之、吉野将生、山路晃広、大橋雄二、黒澤俊介、鎌田圭、吉川彰
  • Organizer: 第46回結晶成長国内会議(JCCG-46)
• [Presentation] マイクロ引き下げ法によるIrファイバーの育成とその内部組織 (2016)
  • Author(s): 横田有為、二瓶貴之、大橋雄二、黒澤俊介、鎌田圭、吉川彰
  • Organizer: 金属学会2016年秋季講演（第159回）大会
  • Place of Presentation: 大阪大学豊中キャンパス(大阪府・豊中市）
• [Presentation] マイクロ引き下げ法によるIrおよびPtファイバー育成と組織観察 (2016)
  • Author(s): 横田有為、二瓶貴之、鎌田圭、大橋雄二、荒川元孝、黒澤俊介、吉川彰
  • Organizer: 2016年秋季 第77回応用物理学会学術講演会
  • Place of Presentation: 朱鷺メッセ（新潟県・新潟市）
• [Presentation] Growth of Iridium and Platinum fiber crystals from the melt by micro-pulling-down method (2016)
  • Author(s): Y. Yokota, K. Tanaka, C. Sugawara, K. Sakairi, Y. Ohashi, S. Kurosawa, K. Kamada, A. Yoshikawa
  • Organizer: The 18th International Conference on Crystal Growth and Epitaxy (ICCGE-18)
  • Place of Presentation: 名古屋国際会議場（愛知県・名古屋市）
  • Int'l Joint Research
• [Presentation] 高融点貴金属材料における融液からの直接線材化技術の開発 (2016)
  • Author(s): 横田有為、二瓶貴之、鎌田圭、大橋雄二、黒澤俊介、吉川彰
  • Organizer: 第11回日本フラックス成長研究発表会
  • Place of Presentation: 東北大学（宮城県・仙台市）
  • Invited
• [Presentation] 高融点金属ファイバー結晶の製造技術開発 (2015)
  • Author(s): 横田有為、田中 邦弘、坂入 弘一、黒澤俊介、大橋雄二、鎌田圭、吉川彰
  • Organizer: 第45回結晶成長国内会議(NCCG-45)
  • Place of Presentation: 北海道大学（北海道・札幌市）
  • Year and Date: 2015-10-20
• [Patent(Industrial Property Rights)] 金属部材 (2017)
  • Inventor(s): 吉川彰、横田有為、二瓶貴之、鎌田圭、黒澤俊介他
  • Industrial Property Rights Holder: 吉川彰、横田有為、二瓶貴之、鎌田圭、黒澤俊介他
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2017-125222
  • Filing Date: 2017
• [Patent(Industrial Property Rights)] 金属部材製造方法 (2016)
  • Inventor(s): 横田有為、吉川彰、 黒澤俊介、大橋雄二、 鎌田圭、庄子育宏
  • Industrial Property Rights Holder: 横田有為、吉川彰、 黒澤俊介、大橋雄二、 鎌田圭、庄子育宏
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2016-093344
  • Filing Date: 2016-05-06