Microfriction studies of model self-lubricating surfaces

Self-lubricating composites consist of at least one structural (matrix) phase and at least one phase to provide lubrication. Modelling the behavior of such composites involves ascertaining the frictional contributions of each constituent phase under varying conditions of lubricating film coverage. T...

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Bibliographic Details
Published in:Surface & coatings technology 1993-12, Vol.62 (1), p.380-387
Main Authors: Blau, P.J., Yust, C.S.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Friction, lubrication, and wear
Materials science
Mechanical and acoustical properties
adhesion
Physics
Solid surfaces and solid-solid interfaces
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Treatment of materials and its effects on microstructure and properties
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Summary:Self-lubricating composites consist of at least one structural (matrix) phase and at least one phase to provide lubrication. Modelling the behavior of such composites involves ascertaining the frictional contributions of each constituent phase under varying conditions of lubricating film coverage. The ORNL friction microprobe, a specialized microcontact tribometer, was used to investigate the frictional behavior of both matrix and lubricant phases in order to support the development of self-lubricating surfaces. Polished chemical-vapour-deposited SiC deposits and silicon wafers were used as substrates. The wafers were intended to simulate the thin SiO 2 films present on SiC surfaces at elevated temperatures. MoS 2 in both sputtered and burnished forms was used as the model lubricant. The effects of the chemical-vapor-deposited SiC substrate surface roughness and method of lubricant film deposition on the substrate were studied for single passes of a spherical Si 3N 4 slider (NBD 200 material). In contrast to the smooth sliding exhibited by burnished films, sputtered MoS 2 surfaces exhibited marked stick-slip behavior, indicating that the frictional behavior of solid lubricating coatings can be quite erratic on a microscale, especially when asperity contacts are elastically complaint.
ISSN:0257-8972
1879-3347
DOI:10.1016/0257-8972(93)90271-O