Solid lubrication of ceramic sufraces by IAD (ion-assisted deposition)-silver coatings for heat engine applications

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

OSTI ID:5491104

Erdemir, A; Fenske, G R; Nichols, F A; Erck, R A ^[1]

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1. Argonne National Lab., IL (USA)

In this study, an investigation was made of the tribological characteristics of alumina ceramics coated with silver by means of ion-assisted deposition (IAD). Tests were performed at temperatures up to 400{degree}C on an oscillating-slider wear test machine capable of simulating the reciprocating motion of a ring/cylinder system. The results showed that higher test temperatures caused greater wear damage and increased friction for uncoated alumina. At 400{degree}C, the wear rates of the alumina-alumina test pairs were 8 to 10 times higher than those tested at room temperature. The steady-state friction coefficients were also fairly high, typically ranging from 0.8 to 1.1. In contrast, the wear rate of IAD-silver coated flats was virtually zero and the wear rates of the counterface pins were reduced by a factor of 72. Friction was also reduced to about half to one third of those for the uncoated pairs. Surface and structure analytical investigations together with the hot-hardness testing of substrate alumina at temperatures up to 600{degree}C were performed to ascertain the mechanisms responsible for the friction and wear behavior of both alumina-alumina and alumina-IAD-silver coated alumina pairs. 28 refs., 8 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/CE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5491104
• Report Number(s): CONF-891036-2; ON: DE90002860
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330200 -- External Combustion Engines
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
42 ENGINEERING
425000 -- Engineering-- Power Cycles-- (1980-)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
COATINGS
CRYSTAL STRUCTURE
DEPOSITION
ELEMENTS
ENGINES
FRICTION
HEAT ENGINES
LUBRICANTS
LUBRICATION
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SILVER
SOLID LUBRICANTS
TRANSITION ELEMENTS
TRIBOLOGY
WEAR