Nano-Characterization of Ceramic Top-Coat/Metallic Bond-Coat Interface for Thermal Barrier Coating Systems by Plasma Spraying

• Takahashi Satoru

  Department of Mechanical Engineering, Graduate School of Engineering, Tokyo Metropolitan University

• Yoshiba Masayuki

  Department of Mechanical Engineering, Graduate School of Engineering, Tokyo Metropolitan University

• Harada Yoshio

  Thermal Spraying Technology R & D Laboratory, Tocalo Co., Ltd.

Bibliographic Information

Other Title

• プラズマ溶射法による遮熱コーティングシステムのセラミックトップコート/金属ボンドコート界面のナノキャラクタリゼーション
• プラズマ ヨウシャホウ ニ ヨル シャネツ コーティング システム ノ セラミック トップ コート キンゾク ボンド コート カイメン ノ ナノキャラクタリゼーション

Abstract

Characterization at the ceramic top-coat/metallic bond-coat interfacial region was conducted for several kinds of the plasma sprayed thermal barrier coating (TBC) systems by means of a transmission electron microscope (TEM), an electron probe micro-analysis (EPMA) and so forth, in order to find out the optimum compositional and structural conditions of the coating components together with the optimum coating processing condition for designing the advanced TBC systems. Specimens with different coating features were prepared systematically by using different coating parameters such as the top-coat spraying conditions and reheat-treatment conditions. Especially, the reheat-treatment was applied to the TBC specimen with different temperature either in air or in inert argon (Ar) gas atmosphere. It was found that in the case of reheat-treatment in air the thermally grown oxide (TGO) was developed at the interface as multiple oxide layers; one is Al₂O₃ layer developed discontinuously at directly above the bond-coat and another is the mixed oxides layer consisting of the Al, Cr, Co, Ni oxide particles on the Al₂O₃ layer. Such a TGO layer was heterogeneous and imperfect layer with containing many kinds of defects. On the contrary, the TGO layer formed by the reheat-treatment in Ar was composed dominantly of the continuous and fairly purified Al₂O₃ layer with large grain size and homogeneous layer thickness. The growth mechanism and influencing factors for TGO were discussed in some detail on the basis of the nano-characterization and quantitative evaluation of TGO.

Journal

• Journal of the Japan Institute of Metals and Materials

  Journal of the Japan Institute of Metals and Materials 68 (6), 372-380, 2004

  The Japan Institute of Metals and Materials

Keywords

• thermal barrier coating
• nano-characterization
• thermally grown oxide
• plasma spraying
• transmission electron microscopy

Details

• CRID: 1390001206479348608
• NII Article ID: 130004455473
• NII Article ID: 10013136322
• NII Book ID: AN00187860
• DOI: 10.2320/jinstmet.68.372
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• ISSN: http://id.crossref.org/issn/00214426
• NDL BIB ID: 7011681
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7011681
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/68/6/68_6_372/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed