Tribological properties of ceramic/Ti3Al-Nb sliding couples for use as candidate seal materials to 700 degree C

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:7158104

Dellacorte, C; Steinetz, B M; Brindley, P K

Tribological properties of Ti3Al-Nb intermetallic disks sliding against alumina-boria-silicate fabric were ascertained in air at temperatures from 25 to 700 C. These materials are candidates for sliding seal applications for the National AeroSpace Plane. The tests were done using a pin on disk tribometer. Sliding was unidirectional at 0.27 m/sec under a nominal contact stress of 340 kPa. Gold sputter or ion plating deposited films were used to reduce friction and wear. Rhodium and palladium films were used beneath the gold lubricating films to prevent diffusion of the substrate into the gold at high temperature. The friction and wear of the unlubricated specimens was unacceptable. Friction coefficients were generally greater than 1.0. The ion plated gold films, when used with a rhodium diffusion barrier reduced friction by almost a factor of 2. Wear was also substantially reduced. The sputter deposited films were not adherent unless the substrate was sputter cleaned immediately prior to film deposition. Palladium did not function as a diffusion barrier.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 7158104
• Report Number(s): N-90-12658; NASA-TM--102401; E--5048; NAS--1.15:102401; CONF-900419--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CERAMICS
ELEMENTS
FRICTION
GOLD
LUBRICATION
MATERIALS
MECHANICAL PROPERTIES
METALS
NIOBIUM
SEALING MATERIALS
SLIDING FRICTION
TEMPERATURE EFFECTS
TITANIUM ALLOYS
TRANSITION ELEMENTS
TRIBOLOGY
WEAR RESISTANCE