Studies on additive-additive interactions: Formulation of crankcase oils towards rationalization

Ramakumar, S.S.V.; Rao, A. M.; Srivastava, S. P.

doi:10.1016/0043-1648(92)90147-z

Cited by 45 publications

(17 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…They are also employed in gear and other industrial oils where they act as rust inhibitor and extreme-pressure additives. It has been shown by several authors that these additives can contribute to wear and scuffing control, both when used as additives in simple solution [8][9][10][11][12] and in synergistic combination with more conventional antiwear additives [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Film Forming and Friction Properties of Overbased Calcium Sulphonate Detergents

Topolovec-Miklozic

Forbus²,

Spikes

2007

Tribol Lett

View full text Add to dashboard Cite

The film-forming and friction properties of overbased calcium sulphonate (OBCaSu) detergents in rolling-sliding, thin film, lubricated contact have been investigated. All of the commercial detergents studied form thick, solid-like, calcium carbonate films on the rubbed surfaces, of thickness 100-150 nm. The films have a padlike structure, interspersed by deep valleys in which practically no film is present. These films have the effect of increasing friction in intermediate speed conditions, an effect which is believed to occur because the pad structure of the film inhibits fluid entrainment and thus postpones the formation of an EHD film to higher entrainment speeds. Large differences were noted between the boundary friction coefficients of the various detergents tested. Two of them gave very low boundary friction coefficients, in the range 0.06-0.08, while the other two gave considerably higher friction. These differences are believed to originate from differences in the structures of the alkyl chains in the sulphonate detergent molecules. The films formed by OBCaSu detergents can be removed very effectively by treatment with EDTA solution and this shows that the films are effective in preventing wear.

show abstract

Section: Introductionmentioning

confidence: 99%

Film Forming and Friction Properties of Overbased Calcium Sulphonate Detergents

Topolovec-Miklozic

Forbus²,

Spikes

2007

Tribol Lett

View full text Add to dashboard Cite

show abstract

“…The interaction of ZDDP with detergents has been investigated in the past. (Inoue & Watanabe, 1983, Ramakumar et al, 1992. The ZDDP additive decomposes in oil solution and on the rubbing surfaces to give the so-called antiwear film (Yin et al, 1997a, Suominen Fuller et a1.,1988.…”

Section: Introductionmentioning

confidence: 99%

Study of the effects of Ca sulfonate on antiwear film formation by X-ray absorption spectroscopy using synchrotron radiation

Kasrai¹,

Vasiga²,

Fuller³

et al. 1999

J Synchrotron Radiat

View full text Add to dashboard Cite

“…This fact imposed to use an inert material (Pyrex Ò glass) to build the catalytic test apparatus. (c) Engine oils are constituted of a mixture from different hydrocarbons (from C10 to C100) with an average chain length about C25 (pentacosane) and additives to favour properties such as viscosity, thermal stability, and corrosion resistance [20,21]. This means that the vapour composition is complex and depends on the temperature of the saturator.…”

Section: Catalytic Testmentioning

confidence: 99%