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.

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.
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.
Due to the high amount of boundary lubrication present in the related pumps the "lubricity" of the handled fuel is a vital characteristic for the system's longevity.
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.
The need for improved lubricating technologies is critical when trying to solve tribological problems concerning dry friction or boundary lubrication under high temperatures.
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.
As shown in Figure 2, with the increase of test speed, lubrication condition in the test changed from boundary lubrication to hydrodynamic lubrication.