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Synergistic erosion/corrosion of superalloys in PFB coal combustor effluentTwo Ni-based superalloys were exposed to the high velocity effluent of a pressurized fluidized bed coal combustor (PFBC). Targets were 15-cm diameter rotors operating at 40,000 rpm and small flat plate specimens. Above an erosion rate threshold (approximately 10 microns/hr), the targets were eroded to bare metal. The presence of accelerated oxidation at lower erosion rates suggests erosion/corrosion synergism. Various mechanisms which may contribute to the observed oxide growth enhancement include erosive removal of protective oxide layers, oxide and subsurface cracking, and chemical interaction with sulfur in the gas and deposits through damaged surface layers.
Document ID
19810060259
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Benford, S. M. (NASA Lewis Research Center Cleveland, OH, United States)
Zellars, G. R. (NASA Lewis Research Center Cleveland, OH, United States)
Lowell, C. E. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 11, 2013
Publication Date
April 1, 1980
Subject Category
Metallic Materials
Meeting Information
Meeting: Annual Meeting
Location: Chicago, IL
Start Date: April 28, 1980
End Date: April 30, 1980
Sponsors: American Ceramic Society
Accession Number
81A44663
Distribution Limits
Public
Copyright
Other

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