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Impact Resistance of Environmental Barrier Coated SiC/SiC CompositesImpact performance of 2D woven SiC/SiC composites coated with 225 and 525 microns thick environmental barrier coating (EBC) was investigated. The composites were fabricated by melt infiltration and the EBC was deposited by plasma spray. Impact tests were conducted at room temperature and at 1316 C in air using 1.59 mm diameter steel-balls at projectile velocities ranging from 110 to 375 m/s . Both microscopy and non-destructive evaluation (NDE) methods were used to determine the extent of damage in the substrate and coating with increasing projectile velocity. The impacted specimens were tensile tested at room temperature to determine their residual mechanical properties. At projectile velocities less than 125 m/s , no detectable internal damage was noticed in the MI SiC/SiC composites coated with 525 microns EBC. With increase in projectile velocity beyond this value, spallation of EBC layers, delamination of fiber plies, and fiber fracture were detected. At a fixed projectile velocity, the composites coated with 525 microns EBC showed less damage than those coated with 225 microns EBC. Both types of coated composites retained a large fraction of the baseline properties of the as-fabricated composites and exhibited non-brittle failure after impact testing. Furnace exposure of impacted specimens in a moisture environment at 1316 C for 500 h indicated that the through-the-thickness cracks in the coating and delamination cracks in the substrate generated after impact testing acted as conduits for internal oxidation.
Document ID
20080047091
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
Authors
Bhatt, Ramakrishna T.
(Army Research Lab. Cleveland, OH, United States)
Choi, Sung R.
(Naval Air Systems Command Patuxent River, MD, United States)
Cosgriff, Laura M.
(Cleveland State Univ. Cleveland, OH, United States)
Fox, Dennis S.
(NASA Glenn Research Center Cleveland, OH, United States)
Lee, Kang N.
(Rolls-Royce Corp. Indianapolis, IN, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Publication Information
Publication: Materials Science and Engineering A
Publisher: Elsevier
Volume: 476
Issue: 2-Jan
ISSN: 0921-5093
Subject Category
Composite Materials
Funding Number(s)
CONTRACT_GRANT: NNC06GA15G
Distribution Limits
Public
Copyright
Other

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