Abstract
Thermal barrier coatings (TBCs) composed of yttria stabilized zirconia (YSZ) deposited via electron beam physical vapor deposition (EBPVD) on MCrAlY and platinum diffusion aluminide bond coats on the superalloy Rene N5 have been compared in cyclic oxidation in air at 1100°C. The MCrAlY bond coats were fabricated by using several different plasma spray processes. The TBCs on the MCrAlY bond coats had shorter lives compared to the TBCs on the platinum al&de bond coats. This difference in TBC performance is proposed to be caused by the presence of other oxides than alumina on the MCrAlY bond coats which caused the toughness of the TBCTGO-bond coat region to be reduced. Processing variables which affect TBC performances are discussed. Superalloys 2oc0 Edited byT.M. Pollock, R.D. Kissinger, R.R. Bowman, K.A. Green, M. McLean, S. Olson, and J.J. Schirra TMS (Tne Minerals. Metals &Materials Society), 2O@J
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