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High temperature brush seal tuft testing of metallic bristles versus chrome carbideThe tribology of brush seals is of considerable interest to turbine engine designers because bristle wear continues to limit long term seal performance and life. To provide better materials characterization and foster the development of improved seals, NASA Lewis has developed a brush seal tuft tester. In this test, a 'paintbrush' sample tuft is loaded under constant contact pressure against the outside diameter of a rotating journal. With this configuration a direct measurement of load and friction is made. Accurate wear rate measurements are possible due to the known contact pressure. Previously reported baseline research using this facility showed good data repeatability and wear morphology similar to published seal data. This paper extends and expands the database for candidate brush seal materials. A series of tuft tests were completed to evaluate the performance of five high temperature superalloy wires sliding against plasma sprayed nichrome-bonded chrome carbide. Wire materials were either nickel-chrome or cobalt-chrome based superalloys. Good corroboration of the tuft results with dynamic seal rig tests was observed; giving additional confidence in the tuft test as a screening and development tool.
Document ID
19960038251
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Fellenstein, James A. (Ohio Aerospace Inst. Cleveland, OH United States)
DellaCorte, Christopher (NASA Lewis Research Center Cleveland,OH United States)
Moore, Kenneth D. (Pratt and Whitney Aircraft West Palm Beach, FL United States)
Boyes, Esther (Pratt and Whitney Aircraft East Hartford, CT United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1996
Subject Category
Nonmetallic Materials
Report/Patent Number
E-10282
NAS 1.15:107238
NASA-TM-107238
AIAA-96-2908
Meeting Information
Meeting: Joint Propulsion Conference
Location: Lake Buena Vista, FL
Country: United States
Start Date: July 1, 1996
End Date: July 3, 1996
Sponsors: American Inst. of Aeronautics and Astronautics, Society of Automotive Engineers, Inc., American Society of Mechanical Engineers, American Society for Electrical Engineers
Accession Number
96N30731
Funding Number(s)
PROJECT: RTOP 505-63-5A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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