MODELLING AND NEUTRON DIFFRACTION MEASUREMENT OF STRESSES IN SPRAYED TBCs
J.A. Thompson, J. Matejicek, T.W. Clyne
Department of Materials Science & Metallurgy University of Cambridge; Department of Materials Science & Engineering State University of New York
Abstract
Thick TBC deposits have been deposited onto mild steel substrates. A CoNiCrAlY bond coat was applied by vacuum plasma spraying (VPS), while a ZrO2-8wt% top coat was deposited by air plasma spraying (APS). An in-situ curvature monitoring technique was used, in conjunction with thermal histories and deposit and substrate properties, to assist in the running of an existing numerical process model for the prediction of residual stresses in thermally sprayed coatings. Neutron diffraction experiments were performed independently on the same samples, in order to obtain the through thickness stress profiles. The agreement between the results obtained via these two techniques was excellent.
keywords:TBCs; bond coat; top coat; plasma spraying; process model; Thermal spraying
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