Tribochemistry of Lubricating Oils, Volume 45 (Tribology and by Zenon Pawlak

By Zenon Pawlak

KEY good points: Assists scientists, engineers and researchers within the improvement of a brand new excessive functionality lubricant· a necessary assessment of the country of information in tribochemistry. the 1st e-book released on the topic of tribochemistry oils DESCRIPTION:This most recent identify takes a brand new and unconventional examine engine oil as a micellar approach. it's the first ebook of its sort to target the tribochemistry of oils and is hence an important source to working towards scientists and engineers within the petroleum and to all attracted to the advance of an outstanding excessive functionality lubricant. ensuring its wide charm the e-book provides a useful evaluate of the kingdom of information within the quickly turning out to be region of tribochemistry. the idea that of miscelles is obviously defined alongside their program to stimulate the standard of engine oil, increase gas potency and keep sufficient put on safety formula. This represents a clean method of the formation of anti-wear tribofilms. a brand new examine engine layout developments is given additional helping engineers within the improvement of an outstanding lubricant

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Tribochemistry of Lubricating Oils, Volume 45 (Tribology and Interface Engineering)

KEY good points: Assists scientists, engineers and researchers within the improvement of a brand new excessive functionality lubricant· an important overview of the kingdom of data in tribochemistry. the 1st ebook released relating to tribochemistry oils DESCRIPTION:This newest identify takes a brand new and unconventional examine engine oil as a micellar method.

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A larger or higher molecular weight polymer of the same type will generally contribute to more thickening. Shear stability is another important property of VI improvers. Larger long-chain polymers are more likely to be broken apart by shear forces between moving surfaces. Once this type of permanent shearing takes place, the polymer contributes less to high-temperature thickening. Therefore, formulation of high VI oils using polymeric VI improvers require selection of a polymer that will continue to provide adequate high-temperature thickening in service.

Metal compounds can have an oxidizing or reducing effect, see Fig. 7 (Klamann, 1984). 1000 800 600 h UOQ 200 \ Fig. 7. Oxidation tendency of mineral oils at 175°C as a function of base oil, degree of refming, and the addition of metals and inhibitors. Graph shows: (a) highly refined oil (Oil 1); (b) Oil 1 with Fe wire; (c) Oil 1 with Cu wire; (d) Oil 1 with sulfur-phosphorus inhibitor; (e) Oil 1 with Fe wire and sulfur-phosphorus inhibitor; (f) nor-mally refined oil (Oil 2); (g) Oil 2 with sulfur-phosphorus inhibitor; (h) Oil 1 with Ca detergent; (i) Oil 1 with Ca detergent and sulfur-phosphorus inhibitor (Klamann, 1984) Metal compounds reach the lubricating oil by surface abrasion or the corrosive action of acidic oxidation products.

Varnish and lacquer deposits that can form on the piston undercrown and skirts reduce the rate at which the piston transfers heat to the engine oil. The products of high temperature lubricant oxidation are highly-acidic polar 26 Chapter 2 oxygenates which have low solubility in mineral oil and a strong affinity for other polar compounds and metal surfaces. They readily polymerize, and when trapped in ring grooves, they further decompose to hard carbonaceous deposits (Kreuz, 1969 and 1970). Typical detergent additives are normal or basic barium, calcium or magnesium salts of substituted long-chain alkyl compounds (Moreton, 1998).

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