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Tribological evaluation of an Al2O3-SiO2 ceramic fiber candidate for high temperature sliding sealsA test program to determine the relative sliding durability of an alumina-silica candidate ceramic fiber for high temperature sliding seal applications is described. Pin-on-disk tests were used to evaluate the potential seal material by sliding a tow or bundle of the candidate ceramic fiber against a superalloy test disk. 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. Test variables studied included ambient temperatures from 25 to 900 C, loads from 1.3 to 21.2 N, and sliding velocities from 0.025 to 0.25 m/sec. In addition, the effects of fiber diameter and elastic modulus on friction and wear were measured. Thin gold films deposited on the superalloy disk surface were evaluated in an effort to reduce friction and wear of the fibers. In most cases, wear increased with test temperature. Friction ranged from 0.36 at 500 C and low velocity (0.025 m/sec) to over 1.1 at 900 C and high velocity (0.25 m/sec). The gold films resulted in satisfactory lubrication of the fibers at 25 C. At elevated temperatures diffusion of substrate elements degraded the films. These results indicate that the alumina-silica (Al2O3-SiO2) fiber is a good candidate material system for high temperature sliding seal applications. More work is needed to reduce friction.
Document ID
19950053694
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dellacorte, Christopher
(NASA Lewis Research Center Cleveland, OH, United States)
Steinetz, Bruce
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1994
Publication Information
Publication: STLE Tribology Transactions
Volume: 37
Issue: 2
ISSN: 0569-8197
Subject Category
Mechanical Engineering
Accession Number
95A85293
Distribution Limits
Public
Copyright
Other

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