Collaborative Research on Adhesion Strength of Thermal Barrier Coatings in JSMS

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  • OKAZAKI Masakazu
    Department of Mechanical Engineering, Nagaoka University of Technology
  • YAMAZAKI Yasuhiro
    Department of Mechanical and Control Engineering, Niigata Institute of Technology
  • NAMBA Kouichi
    Machinery & Systems Hq., Mitsui Engineering & Shipbuilding Co., Ltd.
  • OGAWA Kazuhiro
    Fracture and Reliability Research Institute, Tohoku University
  • OHKI Motofumi
    Department of Materials Science and Technology, Faculty of Engineering, Niigata University
  • FUJIYAMA Kazunari
    Department of Mechanical Engineering, Faculty of Science and Technology, Meijo University
  • WAKI Hiroyuki
    Department of Mechanical Engineering, Osaka Electro-Communication University
  • ARAI Masayuki
    Materials Science Research Laboratory, Central Research Institute of Electric Power Industry
  • SEKIHARA Masaru
    Materials Research Laboratory, Hitachi, Ltd.
  • ITOH Akihiro
    Electric Power R&D Center, Chubu Electric Power Co., Inc.
  • FUKANUMA Hirotaka
    Representative Director, Plasma Giken, Co. Ltd
  • OHNO Naoyuki
    Engineering Department, Plasma Giken, Co. Ltd
  • KANEKO Hideaki
    Material & Strength Laboratory, TAKASAGO Research & Development Center, Mitsubishi Heavy Industries, Ltd.
  • KAWAMURA Masashi
    Material Research Department, Technical Institute, Kawasaki Heavy Industries, Ltd.

Abstract

This paper introduces the brief summary of the recent collaboration test results on thermal barrier coatings (TBCs) in the JSMS Subcommittee, which covers the measurements of elastic modulus, tensile strength, residual stress and thermal conductivity of the TBC specimens. Here, the round-robin TBC specimens consisting of 8% yttria stabilized zirconia, CoNiCrAlY alloy bond coat and Ni-base superalloy were prepared by plasma spraying method. The isothermal exposure and the thermal cycles were applied to the TBC specimens by several conditions at high temperatures, to measure both the residual stress and the remaining adhesion strength of the ceramic top, as well as to characterize the thermally grown oxide at the top coat/bond coat interface. The round-robin test results clearly demonstrated that the adhesion strength was significantly changed by the application of thermal cycles and the isothermal exposure. Of particular important results was found in the remaining adhesion strength that were strongly dependent on the testing method to give the thermal cycles.

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