Lubricity

Lubricity

Lubricity is the measure of the reduction in friction of a lubricant. The study of lubrication and mechanism wear is called tribology.

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 contains sulfur 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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  • Lubricity — Lu*bric i*ty, n. [L. lubricitas: cf. F. lubricit[ e].] [1913 Webster] 1. Smoothness; freedom from friction; also, property which diminishes friction; as, the lubricity of oil. Ray. [1913 Webster] 2. Slipperiness; instability; as, the lubricity of …   The Collaborative International Dictionary of English

  • lubricity — index obscenity, pornography Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • lubricity — late 15c., lasciviousness, from M.Fr. lubricité or directly from L. lubricitatem (nom. lubricitas), from lubricus slippery (see LUBRICANT (Cf. lubricant) (adj.)). Sense of oiliness, smoothness is from 1540s; figurative sense of shiftiness is from …   Etymology dictionary

  • lubricity — [lo͞o bris′i tē] n. pl. lubricities [Fr lubricité < LL lubricitas] 1. slipperiness; smoothness; esp., effectiveness as a lubricant as indicated by this quality 2. trickiness; shiftiness 3. lewdness lubricious [lo͞obrish′əs] adj. lubricous… …   English World dictionary

  • lubricity — /looh bris i tee/, n., pl. lubricities. 1. oily smoothness, as of a surface; slipperiness. 2. ability to lubricate; capacity for lubrication: the wonderful lubricity of this new oil. 3. instability; shiftiness; fleeting nature: the lubricity of… …   Universalium

  • lubricity — noun /luːˈbɹɪsɪti/ a) Slipperiness, oiliness. Though her lubricity made it redundant, Anthea passed him the oil to caress her thighs. b) Evasiveness, shiftiness …   Wiktionary

  • lubricity — tepumas statusas T sritis Standartizacija ir metrologija apibrėžtis Produkto gebėjimas sumažinti dilimą ir trintį kitaip, ne vien dėl savo klampos. atitikmenys: angl. lubricity vok. Schmierfähigkeit, f; Schmiergüte, f; Schmierwert, m rus.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • lubricity — tepumas statusas T sritis chemija apibrėžtis Medžiagos geba sumažinti besitrinančių paviršių trintį ir dilimą. atitikmenys: angl. lubricity rus. смазывающая способность …   Chemijos terminų aiškinamasis žodynas

  • lubricity — lubricious (also lubricous) ► ADJECTIVE 1) lewd. 2) smooth and slippery with oil or grease. DERIVATIVES lubriciously adverb lubricity noun …   English terms dictionary

  • lubricity — noun (plural ties) Date: 15th century the property or state of being lubricious; also the capacity for reducing friction …   New Collegiate Dictionary

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