NDLI: Surface cracking and interface reaction associated delamination failure of thermal and environmental barrier coatings

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Surface cracking and interface reaction associated delamination failure of thermal and environmental barrier coatings

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lee, Kang N. Zhu, Dong-Ming Miller, Robert A. Eldridge, Jeffrey I. Choi, Sung R.
Copyright Year	2003
Description	In 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.
File Size	8595127
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030055684
Archival Resource Key	ark:/13960/t3tt9k96q
Language	English
Publisher Date	2003-04-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Ceramic Matrix Composites Thermal Control Coatings Mullites Zirconium Oxides Temperature Gradients Sintering Cyclic Loads Delaminating Cracking Fracturing Surface Cracks Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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