Friction and wear characteristics of silicon nitride-graphite and alumina-graphite composites

Journal Article · Mon Apr 01 04:00:00 EST 1991 · ASLE Transactions (American Society of Lubrication Engineers); (United States)

DOI:https://doi.org/10.1080/10402009108982034· OSTI ID:5487328

Gangopadhyay, A; Jahanmir, S ^[1]

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1. NIST, Gaithersburg, MD (USA)

To take advantage of the beneficial properties of advanced ceramics, it is necessary that their friction coefficient be reduced to an acceptable value. One method for achieving this goal is incorporation of a solid lubricant phase in the ceramic matrix. In this study, ceramic-matrix composites were fabricated by drilling a series of small holes in alumina and silicon nitride, which were subsequently filled with NiCl2 intercalated graphite under high pressure. It was found that the addition of graphite to silicon nitride considerably reduces the friction coefficient, but alumina-graphite composites exhibit only a marginal reduction in friction coefficient compared to alumina. The reduction in friction coefficient for silicon nitride-graphite composite can be explained by the formation of transfer films consisting of a mixture of materials from both contacting surfaces. However, for alumina-graphite composites the graphite regions were completely covered with steel wear particles, inhibiting the formation of graphite-containing transfer films. 28 refs.

• OSTI ID: 5487328
• Journal Information: ASLE Transactions (American Society of Lubrication Engineers); (United States), Journal Name: ASLE Transactions (American Society of Lubrication Engineers); (United States) Vol. 34; ISSN 0569-8197; ISSN ASLTA
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320302 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Materials
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
COMPOSITE MATERIALS
ELEMENTAL MINERALS
ELEMENTS
FRICTION
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
LUBRICANTS
LUBRICATING PROPERTIES
MATERIALS
MECHANICAL PROPERTIES
MINERALS
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLID LUBRICANTS
TRIBOLOGY
WEAR RESISTANCE