Tribological evaluation of an Al2O3-SiO2 ceramic fiber candidate for high-temperature sliding seals

Technical Report · Wed Apr 01 00:00:00 EST 1992

OSTI ID:5071132

Dellacorte, C; Steinetz, B

A test program to determine the relative sliding durability of an alumina-silica candidate ceramic fiber for high temperature sliding seal applications as described. This work represents the first reporting of the sliding durability of this material system. 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 C to 900 C, loads from 1.3 to 21.2 Newtons, and sliding velocities from 0.025 to 0.25 m/sec. In addition, the effects of fiber diameter, elastic modulus, and a pretest fiber heat treatment on friction and wear were measured. In most cases, wear increased with temperature. Friction ranged from about 0.36 at 500 C and low velocity (0.025 m/s) to over 1.1 at 900 C and high velocity (0.25 m/s). The pretest fiber heat treatment, which caused significant durability reductions for alumina-boria-silica ceramic fibers tested previously, had little effect on the alumina-silica fibers tested here. These results indicate that the alumina-silica (Al2O3-SiO2) fiber is a good candidate material system for high temperature sliding seal applications.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 5071132
• Report Number(s): N-92-23190; NASA-TM-105611; E-6949; NAS-1.15:105611
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM OXIDES
MECHANICAL PROPERTIES
SEALS
MATERIALS
SILICON OXIDES
FIBERS
SLIDING FRICTION
SOLID LUBRICANTS
TRIBOLOGY
WEAR
ALUMINIUM COMPOUNDS
CHALCOGENIDES
FRICTION
LUBRICANTS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
320302 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Materials