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Furnace Cyclic Behavior of Plasma-Sprayed Zirconia-Yttria and Multi-Component Rare Earth Oxide Doped Thermal Barrier CoatingsCeramic thermal barrier coatings will play an increasingly important role in advanced gas turbine engines because of their ability to enable further increases in engine temperatures. However, the coating performance and durability become a major concern under the increasingly harsh thermal cycling conditions. Advanced zirconia- and hafnia-based cluster oxide thermal barrier coatings with lower thermal conductivity and improved thermal stability are being developed using a high-heat-flux laser-rig based test approach. Although the new composition coatings were not yet optimized for cyclic durability, an initial durability screening of numerous candidate coating materials was carried out using conventional furnace cyclic tests. In this paper, furnace thermal cyclic behavior of the advanced plasma-sprayed zirconia-yttria-based thermal barrier coatings that were co-doped with multi-component rare earth oxides was investigated at 1163 C using 45 min hot cycles. The ceramic coating failure mechanisms were studied by using scanning electron microscopy combined with X-ray diffraction phase analysis after the furnace tests. The coating cyclic lifetime will be discussed in relation to coating phase structures, total dopant concentrations, and other properties.
Document ID
20020062708
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Zhu, Dongming
(Ohio Aerospace Inst. Brook Park, OH United States)
Nesbitt, James A.
(NASA Glenn Research Center Cleveland, OH United States)
McCue, Terry R.
(QSS Group, Inc. Cleveland, OH United States)
Barrett, Charles A.
(NASA Glenn Research Center Cleveland, OH United States)
Miller, Robert A.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 7, 2013
Publication Date
June 1, 2002
Subject Category
Nonmetallic Materials
Report/Patent Number
E-13420
NAS 1.15:211690
NASA/TM-2002-211690
Meeting Information
Meeting: 26th Annual International Conference on Advanced Ceramics and Composites
Location: Cocoa Beach, FL
Country: United States
Start Date: January 13, 2002
End Date: January 18, 2002
Sponsors: American Ceramic Society
Funding Number(s)
PROJECT: RTOP 714-04-20
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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