Tribological properties of alumina-boria-silicate fabric from 25 to 850)degree)C

Technical Report · Tue Mar 01 04:00:00 EST 1988

OSTI ID:5314434

DellaCorte, C

Demanding tribological properties are required of the materials used for the sliding seal between the sidewalls and the lower wall of the variables area hypersonic engine. Temperature range from room temperature and below to operating temperatures of 1000 )degree)C in an environment of air, hydrogen, and water vapor. Candidate sealing materials for this application are an alumina-boria-silicate, ceramic, fabric rope sliding against the engine walls which may be made from copper- or nickel-based alloys. Using a pin-on-disk tribometer, the friction and wear properties of some of these potential materials and possible lubrication methods are evaluated. The ceramic fabric rope displayed unacceptably high friction coefficients (0.6 to 1.3) and, thus, requires lubrication. Sputtered thin films of gold, silver, and CaF/sub 2/ reduced the friction by a factor of two. Sprayed coatings of boron nitride did not effectively lubricate the fabric. Static heat treatment tests at 950 )degree)C indicate that the fabric is chemically attacked by large quantities of silver, CaF/sub 2/, and boron nitride. Sputtered films or powder impregnation of the fabric with gold may provide adequate lubrication up to 1000 )degree)C without showing chemical attack. 5 refs., 7 figs., 2 tabs

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• DOE Contract Number: AI01-86CE50162
• OSTI ID: 5314434
• Report Number(s): DOE/NASA/50162-2; NASA-TM-100806; ON: DE88007319
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603* -- Vehicle Design Factors-- Engine System
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
CERAMICS
DATA
ENGINES
EXPERIMENTAL DATA
FRICTION
HEAT ENGINES
INFORMATION
LUBRICANTS
MATERIALS TESTING
NUMERICAL DATA
SLIDING FRICTION
SOLID LUBRICANTS
TESTING
TRIBOLOGY
VERY HIGH TEMPERATURE