Polishing wear by soot

Ryason, P. R.; Chan, Ignatius Y.; Gilmore, Jason

doi:10.1016/0043-1648(90)90014-2

Cited by 75 publications

(28 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is the most accepted mechanism. It is believed that soot enhances wear either through directly abrading the metallic parts of the engine [9][10][11][12] or by abrasion of antiwear tribofilms formed on the surfaces [13]. Removal of the antiwear tribofilm by soot exposes the underlying metallic surface to wear [14].…”

Section: Abrasionmentioning

confidence: 99%

Corrosive–Abrasive Wear Induced by Soot in Boundary Lubrication Regime

et al. 2016

View full text Add to dashboard Cite

Soot is known to induce high wear in engine components. The mechanism by which soot induces wear is not well understood. Although several mechanisms have been suggested, there is still no consensus. This study aims to investigate the most likely mechanism responsible for soot-induced wear in the boundary lubrication regime. Results from this study have shown that previously suggested mechanisms such as abrasion and additive adsorption do not fully explain the high wear observed when soot is present. Based on the results obtained from tests conducted at varying temperature and soot levels, it has been proven that the corrosive-abrasive mechanism was responsible for high wear that occurred in boundary lubrication conditions.

show abstract

Section: Abrasionmentioning

confidence: 99%

Corrosive–Abrasive Wear Induced by Soot in Boundary Lubrication Regime

et al. 2016

View full text Add to dashboard Cite

show abstract

“…A number of works have also been reported where different tribometric contacts [1][2][3][4][5][6][7][8], which used engine oil soot [9,10] as well as soots suspended in a variety of solvents with and without additives [8,11,12], have been examined to investigate different mechanisms which may be held responsible for this enhancement of wear. Based on these studies it emerges that the wear may be related principally to abrasion [1,2,8,[13][14][15][16][17] of a softer component by the harder soot particles. Some workers have also reported wear by adhesion [10,12] and by a polishing mechanism [6,8].…”

Section: Introductionmentioning

confidence: 97%

Relationship Between Physical Structure and Tribology of Single Soot Particles Generated by Burning Ethylene

Bhowmick

Biswas

2011

Tribol Lett

View full text Add to dashboard Cite

Ethylene gas is burnt and the soot generated is sampled thermophoretically at different heights along the flame axis starting from a region close to the root of the flame. The morphology and crystallinity of the particle are recorded using high resolution transmission electron microscopes. The hardness of a single particle is measured using a nanoindenter. The frictional resistance and material removal of a particle are measured using an atomic force microscope. The particles present in the mid-flame region are found to have a crystalline shell. The ones at the flame root are found to be highly disordered and the ones at the flame tip and above have randomly distributed pockets of short range order. The physical state of a particle is found to relate, but not very strongly, with the mechanical and tribological properties of the particles.

show abstract

“…One quite widely proposed mechanism of wear by soot is that soot abrades the steel surfaces [12]- [14]. A major issue with respect to this is whether soot particles are able to abrade hard steel surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…A major issue with respect to this is whether soot particles are able to abrade hard steel surfaces. Ryason [12] compared the hardness of silica, alumina and carbon black to distinguish their abrasive nature in lubricants. He suggested that soot could act as an abrasive by creating polishing wear.…”

Section: Introductionmentioning

confidence: 99%

Antagonistic Interaction of Antiwear Additives and Carbon Black

2009

View full text Add to dashboard Cite

SUMMARYIt is well known that the presence of soot in engine oils can lead to an increase in wear of engine parts. This is a growing problem as soot levels in diesel engine oils are rising due to a combination of extended drain intervals and the various methods employed to reduce NOx formation such as retarded ignition and exhaust gas recirculation.Several different mechanisms have been proposed by which soot might lead to an increase in wear in mixed lubrication conditions, of which the most widely favoured is abrasion by soot, either of the rubbing metallic parts in engines or of the antiwear additive films formed on rubbing metal surfaces.In this study it is shown that the combination of mixed alkyl ZDDP and carbon black (used as soot surrogate) is strongly antagonistic in terms of wear. In a lubricant containing carbon black, the presence of ZDDP leads to considerably more wear than if ZDDP is left out. A similar, though less severe antagonism is also seen with primary ZDDP and other antiwear and EP additives. By varying the lubricant film thickness it is shown that the effect of carbon black in ZDDP-containing oils is to promote wear up to quite thick hydrodynamic film conditions, approaching the secondary carbon black particle size.It is proposed that the antagonistic wear effect results from a corrosion-abrasive mechanism in which the reaction film formed by antiwear additive and rubbing metal surface is very rapidly and continually abraded by carbon black. At most carbon black concentrations, wear rate then becomes controlled by the rate of initial antiwear additive film formation, which for secondary ZDDP is very rapid, rather than by the kinetics of the abrasive process.From this understanding, strategies for reducing the impact of engine soot on wear can be deduced.

show abstract

Polishing wear by soot

Cited by 75 publications

References 2 publications

Corrosive–Abrasive Wear Induced by Soot in Boundary Lubrication Regime

Corrosive–Abrasive Wear Induced by Soot in Boundary Lubrication Regime

Relationship Between Physical Structure and Tribology of Single Soot Particles Generated by Burning Ethylene

Antagonistic Interaction of Antiwear Additives and Carbon Black

Contact Info

Product

Resources

About