Erosion of gadolinia doped EB-PVD TBCs

SURFACE & COATINGS TECHNOLOGY

卷:201

Article

Steenbakker, R. J. L. ; Wellman, R. G. ; Nicholls, J. R.

关键词: erosion;    EB-PVD TBC;    dopant effects;   

DOI  :  10.1016/j.surfcoat.2006.03.022

来源: Elsevier

【 摘 要 】

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 degrees 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 impaction. (c) 2006 Elsevier B.V. All rights reserved.

【 授权许可】

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