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Thermodynamics and kinetics of pack aluminide coating formation on IN-100An investigation of the effects of pack variables on the formation of aluminide coatings on nickel-base superalloy IN-100 was conducted. Also, the thermodynamics and kinetics of coating formation were analyzed. Observed coating weights were in good agreement with predictions made from the analysis. Pack temperature rather than pack aluminum activity controls the principal coating phase formed. In 1 weight percent aluminum packs, aluminum weight gains were related to the halide pack activator. Solid-state nickel diffusion controlled coating formation from sodium fluoride and chloride and ammonium fluoride activated packs. In other ammonium and sodium halide activated 1 weight percent aluminum packs, gaseous diffusion controlled coating formation.
Document ID
19740003252
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Levine, S. R. (NASA Lewis Research Center Cleveland, OH, United States)
Caves, R. M. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1973
Subject Category
Materials, Nonmetallic
Report/Patent Number
NASA-TM-X-71423
E-7678
Report Number: NASA-TM-X-71423
Report Number: E-7678
Meeting Information
Meeting: Natl. Meeting of the Electrochem. Soc.
Location: Boston
Start Date: October 7, 1973
End Date: October 12, 1973
Accession Number
74N11365
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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