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Erosion of gadolinia doped EB-PVD TBCs

By R J L Steenbakker, R. G. Wellman and J. R. Nicholls

Abstract

Gadolinia additions have been shown to significantly reduce the thermal conductivity of EB-PVD TBCs. The aim of this paper is to further the understanding on the effects of dopants on the erosion resistance of EB-PVD TBCs by studying the effects of 2 mol% Gd2O3 additions on the room and high temperature erosion resistance of as received and aged EB-PVD TBCs. Previously it has been reported that gadolinia additions increased the erosion rate of EB- PVD TBCs, this is indeed the case for room temperature erosion, however under high temperature (825 à °C) erosion conditions this is not the case and the doped TBCs have a slightly lower erosion rate than the standard YSZ EB-PVD TBCs. This has been attributed to a change in the erosion mechanisms that operate at the different temperatures. This change in mechanism was not expected under the impact conditions used and has been attributed to a change in the column diameter, and how this influences the dynamics of particle impactio

Topics: Erosion, EB-PVD TBC, Dopant effects
Publisher: Elsevier Science B.V., Amsterdam.
Year: 2006
DOI identifier: 10.1016/j.surfcoat.2006.03.022
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/4266
Provided by: Cranfield CERES
Journal:

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