boundary lubrication


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boundary lubrication

[′bau̇n·drē ‚lü·brə′kā·shən]
(engineering)
A lubricating condition that is a combination of solid-to-solid surface contact and liquid-film shear.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

boundary lubrication

A phase in lubrication in which a thin film of oil only a few molecules thick separates two rubbing surfaces. It can occur because of a high bearing load, inadequate viscosity, oil starvation, or loss of oil pressure. Boundary lubrication is not a desirable phase of lubrication as a rupture of the thin film means wear and even seizure.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Measurement of solid bodies boundary lubrication frictional coefficient for both kinds of oils used shows following well known lawfullnesses:
Although the effect of galling sensitivity factors (such as roughness, boundary lubrication and temperature) upon skidmarking are not well documented, they are likely.
A number of additives in rubber compounds promote wall-slippage (or boundary lubrication) between the compound and metal surfaces during processing, and we are all probably familiar with various process aids designed for this purpose.
It is assumed that a significantly larger cover ratio would increase the effect of boundary lubrication and a significantly smaller cover ratio would not make the effect more difficult to detect.
They cover near-field spectroscopic delineation of interphase boundaries for chemical mapping at the sub-micron resolution, indentation size effect and the Hall-Petch "law," boundary lubrication and adhesion of rubber from wipers to the JKR equation, the effect of surface roughness on the adhesion of elastomers to hard surfaces, contact problems at the nanometer and micrometer scales and depth sensing indentation techniques, indentation in ceramics, the effect of solid solution impurities on dislocation nucleation in a (001) molybdenum-1.5 at.% iridium single crystal, and self-sustained fracture waves in a soda-lime glass.
Sessions will include contact mechanics, friction and wear; tribomaterials, texturing, coatings and surface modifications; manufacturing processes; elastohydrodynamic, hydrodynamic, and boundary lubrication; molecular tribology, superlubricity, molecular simulations, and microtribology.
They cover the role of surface analysis, nano-scale events in tribochemical reactions in boundary lubrication, the fracture of surface on an atomic scale, materials, and gas phase lubrication.
Petroleum oils have inherent physical and chemical qualities that promote hydrodynamic and boundary lubrication. However, these natural qualities were not sufficient for the internal combustion engine.