- Lubricity
Lubricity is the measure of the reduction in
friction of alubricant . The study of lubrication and mechanism wear is calledtribology .Measurement of lubricity
Lubricity of a material cannot be directly measured, so tests are performed to quantify a lubricant's performance. This is done by determining how much
wear is caused to a surface by a given friction-inducing object in a given amount of time. Other factors such as surface size, temperature, and pressure are also specified. The greater the wear scar the worse the lubricity. For this reason lubricity is also termed a substance's "anti-wear property".Examples of test setups include "Ball-on-cylinder" and "Ball-on-three-discs" tests.
Lubricity in diesel engines
In a modern
diesel engine , the fuel is part of the engine lubrication process.Diesel fuel naturally containssulfur compounds that provide good lubricity, but because of regulations in many countries (such as the US and the EU) sulfur must be removed. Reformulated diesel fuel has a lower lubricity and requires "lubricity improving additives" to prevent excessive engine wear. ["Reformulated Diesel Fuels and Fuel Injection Equipment"; Author: Hugh C. Grigg (Lucas Powertrain Systems) Presented at the New Fuels and Vehicles for Cleaner Air Conference, January 11-12, 1994, Phoenix, Arizona. (Retrieved via Google from a publication of the National Biodiesel Board, entitled "Lubrication")] ["Fuels for Diesel Engines" — Diesel Fuel Injection Equipment Manufacturers Common Position Statement, Signed by: Delphi Diesel Systems, Stanadyne Automotive Corp., Denso Corporation, and Robert Bosch GmbH, issued June, 2000 (Retrieved via Google from a publication of the National Biodiesel Board, entitled "Lubrication")] ["Diesel Fuel Lubricity" Authors: Paul Lacey and Steve Westbrook (Southwest Research Institute) SAE paper 950248, International Congress and Exposition, Detroit, Michigan, February 27-March 2, 1995 (Retrieved via Google from a publication of the National Biodiesel Board, entitled "Lubrication")]ee also
*
Boundary lubrication
*Superlubricity
*Tribology References
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