Friction and wear of silicon nitride and silicon carbide in water - hydrodynamic lubrication at low sliding speed obtained by tribochemical wear

Journal Article · Thu Jan 01 04:00:00 EST 1987 · ASLE Trans.; (United States)

DOI:https://doi.org/10.1080/05698198708981728· OSTI ID:6452634

Tomizawa, H; Fischer, T E

This report describes experiments on friction of Si3N4 and SiC sliding against themselves and against each other in water at room temperature. The friction coefficient of Si3N4 against itself is f = 0.7 at low speeds (0.2 cm/s). At speeds above 6.5 cm/s and 4.91-N load, hydrodynamic lubrication sets in, with f of less than 0.002 and an estimated water film thickness of 70 nm. Between 0.2 and 5 cm/s, mixed lubrication occurs. This remarkably thin hydrodynamic film is made possible by the tribochemical wear of Si3N4 which occurs by dissolution in water and an absence of wear particles. The friction coefficient of SiC, against SiC or Si3N4 in water at low speeds is f = 0.26. Wear occurs by dissolution and fracture pitting. Small wear particles are observed. The friction coefficient of SiC against SiC is independent of sliding velocity between 0.2 and 20 cm/s. 6 references.

• Research Organization: Exxon Research and Engineering Co., Annandale, NJ
• OSTI ID: 6452634
• Journal Information: ASLE Trans.; (United States), Journal Name: ASLE Trans.; (United States) Vol. 30; ISSN ASLTA
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
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36 MATERIALS SCIENCE
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Cermets
& Refractories-- Mechanical Properties
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHEMICAL REACTIONS
FRICTION
HYDROGEN COMPOUNDS
LUBRICATION
NITRIDES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PNICTIDES
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SLIDING FRICTION
TRIBOLOGY
WATER
WEAR