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Multifunctionally graded environmental barrier coatings for silicon-base ceramic components

Patent image
CCDC ARL

A multilayered coating system consisting of a multicomponent zirconia-base or hafnia-base oxide top layer, an interlayer comprised of a plurality of sublayers and a bond coat layer is provided. The multilayered coating system of the present invention, with an interlayer comprised of a plurality of sublayers, provides a protective coating solution for silicon-base ceramic components exposed to very high temperatures and/or high gas flow velocity water vapor combustion environments. The plurality of sublayers affords for a multitude of interfaces that aid in phonon scattering within the coating system and thereby reduces its thermal conductivity. Furthermore, the plurality of interlayer sublayers afford a strain tolerant buffer between the top layer and substrate and thereby accommodate the thermal expansion mismatch between the oxide top layer (coefficient of thermal expansion (CTE) up to ˜8-10×10−6 m/m-C) and the silicon-base ceramic substrate (CTE≈4-5×10−6 m/m-C).

Inventors: 
Zhu, Dongming; Miller, Robert A.
Patent Number: 
Technical domain: 
Materials and Coatings
FIle Date: 
2006-08-28
Grant Date: 
2010-06-22
Grant time: 
1,394 days
Grant time percentile rank: 
25
Claim count percentile rank: 
9
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
US ARMY