Tribological properties of PM212: A high-temperature, self-lubricating, powder metallurgy composite

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

OSTI ID:7007298

Dellacorte, C; Sliney, H E

This paper describes a research program to develop and evaluate a new high temperature, self-lubricating powder metallurgy composite, PM212. PM212 has the same composition as the plasma-sprayed coating, PS212, which contains 70 wt percent metal-bonded chromium carbide, 15 wt percent silver and 15 wt percent barium fluoride/calcium fluoride eutectic. The carbide acts as a wear resistant matrix and the silver and fluorides act as low and high temperature lubricants, respectively. The material is prepared by sequential cold press, cold isostatic pressing and sintering techniques. In this study, hemispherically tipped wear pins of PM212 were prepared and slid against superalloy disks at temperatures from 25 to 850 C in air in a pin-on-disk tribometer. Friction coefficients range from 0.29 to 0.38 and the wear of both the composite pins and superalloy disks was moderate to low in the 10(exp -5) to 10(exp -6) cubic mm/N-m range. Preliminary tests indicate that the material has a compressive strength of at least 130 MPa over the entire temperature range of 25 to 900 C. This material has promise for use as seal inserts, bushings, small inside diameter parts and other applications where plasma-sprayed coatings are impractical or too costly.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 7007298
• Report Number(s): N-90-12659; NASA-TM--102355; E--5066; NAS--1.15:102355; CONF-900588--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM FLUORIDES
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CARBIDES
CARBON COMPOUNDS
CHEMICAL PREPARATION
CHROMIUM CARBIDES
CHROMIUM COMPOUNDS
COMPOSITE MATERIALS
ELEMENTS
EUTECTICS
FLUORIDES
FLUORINE COMPOUNDS
FRICTION
HALIDES
HALOGEN COMPOUNDS
LUBRICANTS
MATERIALS
METALLURGY
METALS
POWDER METALLURGY
SILVER
SLIDING FRICTION
SOLID LUBRICANTS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRIBOLOGY
WEAR