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Title:Rumpling instability in thermal barrier systems under isothermal conditions in vacuum
Author(s):Panat, Rahul Padmakar; Hsia, K. Jimmy; Oldham, Joseph W.
Abstract:Bond coat (BC) surface rumpling has been identified as one of the important mechanisms that can lead to failure of the thermal barrier coatings. The driving force behind rumpling—whether the stresses in the thermally grown oxide over the BC or the stresses in the BC—remains to be clarified. Meanwhile, the mass transport mechanisms in the BC leading to rumpling are not clearly identified. In the present investigation, we subject two types of BC-superalloy systems, nickel aluminide and platinum aluminide BCs on a Ni-based superalloy, to isothermal exposure at temperatures ranging from 1150 to 1200°C in vacuum. The results show that the nickel aluminide BC rumples at 1200°C and at 1175°C in absence of significant oxidation. The wavelength of the rumpled surfaces was 60–100 µm, with an amplitude of 5–8 µm. The rumpling was insensitive to the initial BC surface morphology. At 1150°C, no clear rumpling was observed, but some surface undulations could be seen related to the BC grains. ...[more]...
Issue Date:2003-12
Publisher:Department of Theoretical and Applied Mechanics (UIUC)
Series/Report:TAM Reports 1038
Genre:Technical Report
Publication Status:published or submitted for publication
Peer Reviewed:is peer reviewed
Date Available in IDEALS:2007-03-08
Is Version Of:Published as: Rahul P. Panat, K. Jimmy Hsia, and Joseph W. Oldham. Rumpling instability in thermal barrier systems under isothermal conditions in vacuum. Philosophical Magazine, Vol.85, No.1, 2005, pp. 45-64. DOI: 10.1080/14786430412331309344. Copyright 2005 Taylor and Francis Ltd.

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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