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Relative sliding durability of candidate high temperature fiber seal materialsThe relative sliding durability behavior of six candidate ceramic fibers for high temperature sliding seal applications is reviewed and compared. Pin on disk tests were used to evaluate potential seal materials by sliding a tow or bundle of the candidate ceramic fiber against a superalloy test disk. Tests were conducted in air under a 2.65 N load, at a sliding velocity of 0.025 m/sec and at temperatures from 25 to 900 C. Friction was measured during the tests and fiber wear, indicated by the extent of fibers broken in the tow or bundle, was measured at the end of each test. For most of the fibers, friction and wear increase with test temperature. The relative fiber durability ranking correlates with tensile strength, indicating that tensile data, which is more readily available than sliding durability data, may be useful in predicting fiber wear behavior under various conditions. A dimensional analysis of the wear data shows that the fiber durability is related to a dimensionless durability ratio which represents the ratio of the fiber strength to the fiber stresses imposed by sliding. The analysis is applicable to fibers with similar diameters and elastic moduli. Based upon the results of the research program, three fiber candidates are recommended for further study as potential seal materials. They are a silicon based complex carbide-oxide fiber, an alumina-boria-silica and an aluminosilicate fiber.
Document ID
19930001790
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Dellacorte, Christopher (NASA Lewis Research Center Cleveland, OH, United States)
Steinetz, Bruce M. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1992
Subject Category
Chemistry And Materials (General)
Report/Patent Number
E-7236
NAS 1.15:105806
NASA-TM-105806
Accession Number
93N10978
Funding Number(s)
PROJECT: RTOP 763-22-28
PROJECT: RTOP 505-63-1A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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