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Coating with overlay metallic-cermet alloy systemsA base layer of an oxide dispersed, metallic alloy (cermet) is arc plasma sprayed onto a substrate, such as a turbine blade, vane, or the like, which is subjected to high temperature use. A top layer of an oxidation, hot corrosion, erosion resistant alloy of nickel, cobalt, or iron is then arc plasma sprayed onto the base layer. A heat treatment is used to improve the bonding. The base layer serves as an inhibitor to interdiffusion between the protective top layer and the substrate. Otherwise, the 10 protective top layer would rapidly interact detrimentally with the substrate and degrade by spalling of the protective oxides formed on the outer surface at elevated temperatures.
Document ID
19840019786
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Gedwill, M. A. (NASA Lewis Research Center Cleveland, OH, United States)
Levine, S. R. (NASA Lewis Research Center Cleveland, OH, United States)
Glasgow, T. K. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
May 29, 1984
Subject Category
Metallic Materials
Accession Number
84N27855
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-LEW-13639-2|US-PATENT-4,451,496
Patent Application
US-PATENT-APPL-SN-456460

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