The effect of synthetic additives in lubricating oil on wear under friction

Sanin, P.I.; Shepeleva, E. S.; Ulyanova, A V; Kleimenov, B. V.

doi:10.1016/0043-1648(60)90138-1

Cited by 12 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Examination of the literature indicates that phosphonated oils have been investigated for their tribological properties by themselves [22][23][24][25][26][27] or in the presence of sulfur and/or halogen containing groups [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…Sanin et al [28] investigated the extreme pressure (EP) properties of di-n-butyl methyl phosphonate and tri-n-butyl phosphonate additives in exceedingly pure oil, whose viscosity was measured as 20.8 cSt at 50°C, using 4-Ball machine. They reported increased incipient seizure load (ISL) from 70 kgf without additive to 109 and 137 kgf, with the additives, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tribological Properties of Biobased Ester Phosphonates

Biresaw¹,

Bantchev²

2013

J Americ Oil Chem Soc

View full text Add to dashboard Cite

Three phosphonate derivatives of methyl oleate (MeO) were chemically synthesized in a radical chain reaction and their physical and tribological properties investigated. The phosphonates differed from each other in the structure of the alkoxy groups attached to the phosphorous, which were as follows: methoxy, ethoxy, and n-butoxy. Phosphonylation eliminated the unsaturation in MeO and also introduced branching. The phosphonate oils had higher density and viscosity than MeO, which was attributed to the contribution of the heavier phosphorus atom in their structures, and to their higher molecular weights, respectively. The phosphonates also displayed improved oxidation stability and cold flow properties, which were attributed to the elimination of the double bond and the introduction of branching in their molecular structures, respectively. Tribological investigations were conducted using 4-Ball anti-wear (AW) and extreme pressure (EP) methods. Neat phosphonates displayed lower AW coefficients of friction and wear scar diameters than MeO. The improved AW results were attributed to the higher viscosity of the phosphonates, since the AW test is conducted in the mixed film regime. The phosphonates had no effect on EP weld point (WP) as neat oils or as 5 % additives in petroleum-based oils. In soy base oil, 5 % phosphonate additives displayed smaller improvement in WP than zinc dialkyl dithiophosphate (ZDDP). It is proposed that this lack of EP characteristics could be due to the high dissociation energy of C-P bonds in the phosphonates, compared to, for example, S-P bonds in ZDDP.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Biobased Ester Phosphonates

Biresaw¹,

Bantchev²

2013

J Americ Oil Chem Soc

View full text Add to dashboard Cite

show abstract

“…On the other hand, the best load‐carrying performances were obtained with short chain derivates . Samin et al were the first to show that the short‐chain derivatives are more reactive . Short chains additive were found to produce tribofilms containing both iron phosphate and iron phosphide.…”

Section: Introductionmentioning

confidence: 99%

“…17 Samin et al were the first to show that the short-chain derivatives are more reactive. 20 Short chains additive were found to produce tribofilms containing both iron phosphate and iron phosphide. By increasing the chain length, the film contains less phosphorus.…”

Section: Introductionmentioning

confidence: 99%

First principles study of organophosphorus additives in boundary lubrication conditions: Effects of hydrocarbon chain length

Loehlé

Righi

2017

Lubrication Science

View full text Add to dashboard Cite

We apply first principle calculations to investigate the effects of the hydrocarbon chain length in additive molecules under boundary lubrication conditions. In these conditions, occurring in high‐pressure applications, the thickness of the oil film becomes extremely thin, and the additive molecules remain confined between the two solid surfaces in contact. We consider two types of organophosphorous additives having the same phosphite group but hydrocarbon chains of different lengths. By comparing the molecular behavior under uniaxial stress applied, we elucidate the atomistic mechanisms that control the molecular capacity of maintaining an interfacial spacing under compression and the load‐induced molecular dissociation. This insight is relevant not only for a rational design of lubricant additives but also to provide understanding on the activation mechanisms of tribochemical reactions.

show abstract

Low‐ and zero‐sulphated ash, phosphorus and sulphur anti‐wear additives for engine oils

Spikes

2008

Lubrication Science

234

124

View full text Add to dashboard Cite

Modern engine lubricant specifications include compositional constraints in terms of the permitted level of sulphated ash, phosphorus and sulphur (SAPS). This necessitates a reduction in the concentration of the additive zinc dialkyldithiophosphate (ZDDP) used in engine oils, and there is currently great interest in identifying anti‐wear additives that contain low or zero SAPS to partially or wholly replace ZDDP.This paper reviews the main chemical classes that are reported in the literature as potential low‐ or zero‐SAPS anti‐wear agents. There are many such possible additives, although none appears to be quite as versatile as ZDDP. Instead, combinations of anti‐wear and extreme pressure additives are likely to be employed in the future. The literature reveals a strong imbalance in the amount and depth of research carried out on the various additive types, with a great deal of research on a few classes of additives and very little recent work on most others. Copyright © 2007 John Wiley & Sons, Ltd.

show abstract

The effect of synthetic additives in lubricating oil on wear under friction

Cited by 12 publications

References 6 publications

Tribological Properties of Biobased Ester Phosphonates

Tribological Properties of Biobased Ester Phosphonates

First principles study of organophosphorus additives in boundary lubrication conditions: Effects of hydrocarbon chain length

Low‐ and zero‐sulphated ash, phosphorus and sulphur anti‐wear additives for engine oils

Contact Info

Product

Resources

About