Friction and wear of several compressor gas-path seal movements

Technical Report · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6624985

Bill, R C; Wisander, D W

Rub interaction experiments were conducted on a series of sintered and plasma sprayed compressor gas path seal materials in contact with Ti-6Al-4V blade tip and knife edge rotors. The most rub tolerant materials investigated were sintered Nichrome and plasma sprayed nickel 25 percent graphite. The effectiveness of providing a compliant substrate for dense seal material coatings was also demonstrated. In general, it was observed that rotor wear and high frictional energy generation rates accompanied smearing or surface densification of the materials investigated. The onset of smearing was sensitive to rub interaction parameters and seal geometry. Two complementary models were proposed to account for the smearing trends. One is based on thermal effects, the other on particulate escape effects. They were shown to be consistent with the experimental evidence at hand, and together they predict that smearing, with the onset of high energy rub conditions, is favored when incursion rates (radial motion) are low, incursion depths are high, the seal geometry is of a knife-edge character, and the seal particle size is small.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 6624985
• Report Number(s): N-78-15229; NASA-TP-1128; E-9276
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
COATINGS
COMPRESSOR BLADES
COMPRESSORS
FABRICATION
FRICTION
GAS TURBINES
ROTORS
SEALS
SINTERING
SPRAYED COATINGS
TURBINES
TURBOMACHINERY
WEAR