Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry |
| |
Authors: | Lars Steinberg Ravisankar Naraparaju Mirko Heckert Christoph Mikulla Uwe Schulz Christoph Leyens |
| |
Affiliation: | 1. TU Dresden, Institute of Materials Science (IfWW), D-01062 Dresden, Germany;2. German Aerospace Center (DLR), Institute of Materials Research, D-51170 Cologne, Germany |
| |
Abstract: | Aero-engines operating in dust-laden environments often encounter a lot of dust/sand that causes a severe problem to the TBCs by means of erosion. As the turbine entry temperatures are rising, molten sand is also a big concern to the life-time of TBCs.This paper deals with the TBC behavior under the combined influence of erosion and corrosion attack. Variations in TBC morphology, CMAS infiltration time and CMAS composition and their influence on the erosion resistance at room temperature were investigated. Two different EB-PVD 7YSZ morphologies consisting of a different porosity arrangement were tested in the erosion/corrosion regime. The more ‘Feathery’ structure has a better resistance to erosion compared to a more columnar ‘Normal’ structure, which leads to less degradation of the TBC. However, under the influence of CMAS infiltration the effect was found to be reversed. In general, CMAS-infiltrated EB-PVD TBCs exhibit a higher erosion resistance than the non-infiltrated ones. |
| |
Keywords: | TBC Erosion CMAS EB-PVD 7YSZ |
本文献已被 ScienceDirect 等数据库收录! |
|