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Oxidation behavior of the thin layr formed on yttrium and niobium coated TiAl alloys at high temperatures.

Research Project

Project/Area Number 07650832
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionTohoku University

Principal Investigator

INOUE Hirobumi  Tohoku University, Institute for Advanced Materials Processing, Associate Professor, 素材工学研究所, 助教授 (70006039)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsHigh temperature oxidation / oxide layr / Titanium aluminide / Yttrium / Niobium
Research Abstract

Formation and the high temperature oxidation of the Y and Nb coating layrs have been investigated on the titanium-aluminum alloys, followed by heating under the low oxygen atmosphere at high temperatures. Angle-resolved X-ray photoelectron spectroscopy has been used for characterizing the thin oxide layrs and scales formed by oxidation at high temperatures.
The following results are summarized.
1) The effective thickness of the thin oxide layr on the uncoated TiAl alloy was estimated to be 5.0nm from the relationship between the concentration of titanium and aluminum and the take-off angle by coupling with a model, which consists of a contaminated layr and a titanium concentrated oxide layr on the matrix (the aluminum riched oxide layr). The present results suggest the predominant oxidation of titanium and the aluminum enrichment in the inner oxide layr.
2) Composition ratios of the oxidation states of titanium and aluminum were estimated in the oxide layr. It is also interesting to note that the oxide layr contains titanium and aluminum of oxidation states to be lower than Ti (II) and Al (III), respectively, obtained from the Ti2p and Al2p intensity data as a function of the take-off angle by the curve fitting method.
3) In the Y coated alloy, the predominant oxidation of aluminum occurs. The concentrations of Al (III) and Ti (II) increase and Ti (IV) decreases in the oxide layrs. The characterization is more emphasized in the Al-Y coated alloy. Nb does not affect the oxidation states of titanium and aluminum in the oxides layr of the TiAl alloy.
4) Adhesion is improved of the scale to the substrate of TiAl, Al coated and Al-Y coated alloy.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 井上 博文: "低酸素分圧下で酸化したTiAlの角度分解XPSによる表面分析" 東北大学素材研彙報. Vol.52. 45-54 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Inoue, S.Suzuki, T.Sato and Y.Waseda: "Angle-resolved XPS study of thin layrs formed on the surface of TiAl by oxidizing under low oxygen pressure." Bull. Inst. Adv. Mateer. Process., Tohoku Univ. (SOZAIKEN IHO). Vol.52, No.1,2. 45-54 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 井上博文: "低酸素分圧下で酸化したTiAlの角度分解XPSによる表面分析" 東北大学素材研彙報. Vol.52. 45-54 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H. Inoue: "Angle-resolved XPS study of thin layers formed on the surface of yttrium coated TiAl by oxidizing under low oxygen presssure." Met. Trans. JIM. (予定).

    • Related Report
      1996 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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