Formation of Al2O3 scale on low-Al heat resistant alloys by increasing aluminum outward diffusion flux

• Project/Area Number: 21360351
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Material processing/treatments
• Research Institution: Hokkaido University
• Principal Investigator: HAYASHI Shigenari 北海道大学, 大学院・工学研究院, 准教授 (10321960)
• Co-Investigator(Kenkyū-buntansha): SAKAGUCHI Norihito 北海道大学, 大学院・工学研究院, 准教授 (70344489)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000); Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2010: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2009: ¥14,170,000 (Direct Cost: ¥10,900,000、Indirect Cost: ¥3,270,000)
• Keywords: 表面・界面制御 / 高温腐食防食 / 高温酸化 / 耐熱合金・コーティング / アップヒル拡散 / アルミナスケール / 相変態 / 高温酸化防食 / 耐熱合金 / 表面改質 / Ni基合金 / コーティング / Al外方拡散フラックス

Research Abstract

Several Ni-low Al alloys with various metal coatings (-100nm) were oxidized at 1150℃ in air. Among the coating elements used in the present study, a thin Pt coating with the optimized heating treatment promoted the formation of Al_2O_3 scale on the Ni-14at%Al alloy. Al uphill outward diffusion was confirmed to occur after the heat treatment, and this Al outward diffusion was considered to cause the formation of Al_2O_3 scale on the Ni-low Al alloys.

Research Products

• [Journal Article] Evolution of Al_2O_3 scale formed on Ni-Al-Pt alloys in atmospheres containing water vapor (2011)
  • Author(s): M. Auchi, S. Hayashi, T. Narita, and S. Ukai
  • Journal Title: Materials Science Forum Volume: vol.696 Pages: 132-137
  • Peer Reviewed
• [Journal Article] 合金の高温酸化 (2011)
  • Author(s): 林重成
  • Journal Title: 金属 Volume: vol.81 Pages: 551-556
• [Journal Article] Evolution of Al203 scale formed on Ni-Al-Pt alloys in atmospheres containing water vapor (2011)
  • Author(s): M.Auchi, S.Hayashi, T.Narita, S.Ukai
  • Journal Title: Materials Science Forum Volume: 696 Pages: 132-137
  • Peer Reviewed
• [Presentation] Al_2O_3の相変態に及ぼすFe-Al合金中のAl濃度の影響 (2011)
  • Author(s): 高田雄都、林重成、鵜飼重治
  • Organizer: 日本金属学会149回大会
  • Place of Presentation: 沖縄県
  • Year and Date: 2011-11-07
• [Presentation] Compositional and Environmental Factors Affecting Al_2O_3 Scale Transformation (2011)
  • Author(s): Shigenari Hayashi
  • Organizer: Gordon Research Conference
  • Place of Presentation: Colby-Sawyer College, NH, USA
  • Year and Date: 2011-07-27
• [Presentation] compositional and envvironmental factors affecting Al203 scale transformation (2011)
  • Author(s): Shigenari Hayashi
  • Organizer: Gordon Research Conference
  • Place of Presentation: Colby-Sawyer College, NH, (USA)(招待講演)
  • Year and Date: 2011-07-27
• [Presentation] PtコーティングによるNi-低Al合金上へのAl_2O_3スケール形成 (2011)
  • Author(s): 新居毅篤、林重成、鵜飼重治
  • Organizer: 日本金属学会
  • Year and Date: 2011-03-25
• [Presentation] Ni-低Al合金への元素コーティング法によるAl_2O_3スケール形成能付与 (2010)
  • Author(s): 新居毅篤、林重成、鵜飼重治
  • Organizer: 日本金属学会
  • Place of Presentation: 北海道大学,北海道
  • Year and Date: 2010-09-26