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Multilayer Article Characterized by Low Coefficient of Thermal Expansion Outer LayerA multilayer article comprises a substrate comprising a ceramic or a silicon-containing metal alloy. The ceramic is a Si-containing ceramic or an oxide ceramic with or without silicon. An outer layer overlies the substrate and at least one intermediate layer is located between the outer layer and thc substrate. An optional bond layer is disposed between thc 1 least one intermediate layer and thc substrate. The at least one intermediate layer may comprise an optional chemical barrier layer adjacent the outer layer, a mullite-containing layer and an optional chemical barrier layer adjacent to the bond layer or substrate. The outer layer comprises a compound having a low coefficient of thermal expansion selected from one of the following systems: rare earth (RE) silicates; at least one of hafnia and hafnia-containing composite oxides; zirconia-containing composite oxides and combinations thereof.
Document ID
20040121007
Acquisition Source
Glenn Research Center
Document Type
Other - Patent
Authors
Kang N Lee
Date Acquired
August 22, 2013
Publication Date
July 6, 2004
Subject Category
Chemistry And Materials (General)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-6,759,151
Patent Application
US-Patent-Appl-SN-154526
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