NTRS - NASA Technical Reports Server

Back to Results
Surface Cracking and Interface Reaction Associated Delamination Failure of Thermal and Environmental Barrier CoatingsIn this paper, surface cracking and interface reactions of a BSAS coating and a multi-layer ZrO2-8wt%Y2O3 and mullite/BSAS/Si thermal and environmental barrier coating system on SiC/SiC ceramic matrix composites were characterized after long-term combined laser thermal gradient and furnace cyclic tests in a water vapor containing environment. The surface cracking was analyzed based on the coating thermal gradient sintering behavior and thermal expansion mismatch stress characteristics under the thermal cyclic conditions. The interface reactions, which were largely enhanced by the coating surface cracking in the water vapor environment, were investigated in detail, and the reaction phases were identified for the coating system after the long-term exposure. The accelerated coating delamination failure was attributed to the increased delamination driving force under the thermal gradient cyclic loading and the reduced interface adhesion due to the detrimental interface reactions.
Document ID
Document Type
Technical Memorandum (TM)
Zhu, Dong-Ming
(Army Research Lab. Cleveland, OH, United States)
Choi, Sung R.
(Ohio Aerospace Inst. Brook Park, OH, United States)
Eldridge, Jeffrey I.
(NASA Glenn Research Center Cleveland, OH, United States)
Lee, Kang N.
(Cleveland State Univ. Cleveland, OH, United States)
Miller, Robert A.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 21, 2013
Publication Date
April 1, 2003
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.15:212318
Funding Number(s)
WBS: WBS 22-714-04-05
PROJECT: DA Proj. 1L1-61102-AF-20
Distribution Limits
Public Use Permitted.
No Preview Available