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 ?
This radical innovation virtually eliminates friction and wear at "energy hungry" mating surfaces under the harshest frictional conditions, called boundary lubrication.
The contact between the surfaces increases the friction losses due to appearance of additional boundary lubrication friction losses.
When friction comes up to either mixed or boundary lubrication, AW and EP additives come to play their role.
Includes sections on boundary lubrication by colloidal systems, nanolubricants made of metal dichalcogenides, carbon-based nanolubricants, overbased detergent salts, nanolubricants made of metals and boron-based solid nanolubricants and lubrication additives.
The use of lubricant additives helps in reducing friction losses in hydrodynamic, elastohydrodynamic and boundary lubrication regimes.
According to molecular mechanics theory of friction, the total friction force under boundary lubrication can be resolved into an adhesion component and a deformation component.
These components are designed to impart a variety of desirable properties including balanced lubricity, boundary lubrication, static protection, and permanent surface modification.
The need for improved lubricating technologies is critical when trying to solve tribological problems concerning dry friction or boundary lubrication under high temperatures.
Other topics include characterizing solid surfaces, adhesion, interface temperatures of sliding surfaces, fluid film lubrication, boundary lubrication and lubricants, friction and wear screening test methods, and components and applications.
Research carried out when lubricating with oxidized sunflower oil under boundary lubrication conditions has shown that the increasing amount of hydroperoxides reduces reduction properties of oil wear (Fox, Stachowiak 2003).
This investigation shows that free fatty acids ensure good lubrication at boundary lubrication conditions.