Tribological and microstructural investigation of the PM200 series of self-lubricating composites. [NiCo-Cr[sub 3]C[sub 2]-Ag(Au)-BaF[sub 2]-CaF[sub 2]]

Technical Report · Sun Nov 01 04:00:00 EST 1992

OSTI ID:6998873

Bogdanski, M S

This master's thesis describes an investigation of the effects of processing and compositional variations on the tribological, microstructural, and compressive strength characteristics of PM212. PM212 is a self-lubricating composite, comprised of a wear-resistant metal bonded (NiCo) chromium carbide matrix, containing the solid lubricants barium fluoride/calcium fluoride eutectic and silver. Several alternate composites were formulated which had lubricant and matrix variations. Processing variations included sintering and hot isostatic pressing (HIPping). Pin-on-disk tests were used to screen the alternates for friction and wear properties. Several of the chromium carbide-based self-lubricating composites exhibited low friction and wear in sliding against a nickel-based superalloy. One specific composition contained gold in place of silver to minimize the potential reactivity of the composite with possible environmental contaminants such as sulfur. This formulation also resulted in a composite with good tribological properties. Results indicate that several of these composites have potential use as sliding bearing and seal materials in operation from 25[degrees]C to temperatures as high as 900[degrees]C. The good tribological performance by several different composites showed that the composition of PM212 can be altered without dramatically affecting performance.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center; Case Western Reserve Univ., Cleveland, OH (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AI01-91CE50306
• OSTI ID: 6998873
• Report Number(s): DOE/NASA/0030-9; NASA/CR--190772; ON: DE93003887
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
BEARINGS
CARBIDES
CARBON COMPOUNDS
CHROMIUM CARBIDES
CHROMIUM COMPOUNDS
COBALT ALLOYS
COMPOSITE MATERIALS
COMPRESSION STRENGTH
FABRICATION
FRICTION
LUBRICANTS
MATERIALS
MECHANICAL PROPERTIES
METALLURGY
NICKEL ALLOYS
POWDER METALLURGY
SEALING MATERIALS
SINTERING
SOLID LUBRICANTS
TRANSITION ELEMENT COMPOUNDS
TRIBOLOGY
WEAR