CHARACTERISTICS GOVERNING THE FRICTION AND WEAR BEHAVIOR OF REFRACTORY MATERIALS FOR HIGH-TEMPERATURE SEALS AND BEARINGS. Period covered March 1, 1958-May 31, 1959

Technical Report · Fri Jan 15 04:00:00 EST 1960

OSTI ID:4121639

Sibley, L B; Mace, A E; Grieser, D R; Allen, C M

Various ceramic and cermet materials were evaluated for unlubricated wear resistance at high sliding speed (100 to 200 fps) and low unit load (5to 50 psi) in 1000 to 1800 deg F air. A statistical correlation was obtained between the measured wear rates under these conditions and the coefficient of friction, the thermal-stress resistance, and the thermal dlffusivity of the mated materials on which wear predominated. A mechanism of wear was evolved based on the above correlation and on the experimental study of friction and wear surface- temperature fluctuations using special transducers and color-motion-picture photography. During high-speed sliding, wear appears to be induced by the inability of ceramic and cermet materials to resist thermal stresses produced by temperature gradients within each rubbing surface between small asperities or hot spots. in frictional contact and the body of the respective materials. In this situation the wear rate is influenced both by the configuration of the rubbing pants and by the thermalstress-resistance properties of the materials. Promising materials for high-temperature high-speed sliding bearings and seals include Al/ sub 2/O/sub 3/-Cr-Mo cermets, SiC ceramics, and TiC-Ni-Mo cermets. (auth)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• NSA Number: NSA-15-001836
• OSTI ID: 4121639
• Report Number(s): WADD-TR-60-54
• Country of Publication: United States
• Language: English

Related Subjects

BEARINGS
CERAMICS
CERMETS
FRICTION
HIGH TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
REFRACTORIES
REFRACTORY MATERIALS
SEALS
THERMAL DIFFUSION
THERMAL STRESSES
WEAR