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Multilayer Thermal Barrier Coating (TBC) Architectures Utilizing Rare Earth Doped YSZ and Rare Earth PyrochloresTo allow for increased gas turbine efficiencies, new insulating thermal barrier coatings (TBCs) must be developed to protect the underlying metallic components from higher operating temperatures. This work focused on using rare earth doped (Yb and Gd) yttria stabilized zirconia (t' Low-k) and Gd2Zr2O7 pyrochlores (GZO) combined with novel nanolayered and thick layered microstructures to enable operation beyond the 1200 C stability limit of current 7 wt% yttria stabilized zirconia (7YSZ) coatings. It was observed that the layered system can reduce the thermal conductivity by approximately 45 percent with respect to YSZ after 20 hr of testing at 1316 C. The erosion rate of GZO is shown to be an order to magnitude higher than YSZ and t' Low-k, but this can be reduced by almost 57 percent when utilizing a nanolayered structure. Lastly, the thermal instability of the layered system is investigated and thought is given to optimization of layer thickness.
Document ID
Document Type
Technical Memorandum (TM)
Schmitt, Michael P.
(Pennsylvania State Univ. University Park, PA, United States)
Rai, Amarendra K.
(Universal Energy Systems, Inc. Dayton, OH, United States)
Bhattacharya, Rabi
(Universal Energy Systems, Inc. Dayton, OH, United States)
Zhu, Dongming
(NASA Glenn Research Center Cleveland, OH United States)
Wolfe, Douglas E.
(Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
January 29, 2015
Publication Date
July 1, 2014
Subject Category
Metals And Metallic Materials
Chemistry And Materials (General)
Report/Patent Number
Funding Number(s)
WBS: WBS 794072.
Distribution Limits
Public Use Permitted.
Thermal Barrier Coating
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