Effect of ageing automotive gear oils on scuffing and pitting

Tuszyński, W.; Michalczewski, R.; Piekoszewski, W.; Szczerek, M.

doi:10.1016/j.triboint.2007.12.010

Cited by 34 publications

(20 citation statements)

References 6 publications

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“…The problem of precise identification of scuffing initiation follows from the fact that none of the specific theories (e.g. [5][6][7][8][9]) describes this process in a universal way; most of these theories concern concrete material pair and applying friction conditions. Some kind of synthesis in this field was carried out by Bowman and Stachowiak [10], who listed several factors conducive (especially in synergic occurrence) to scuffing initiation: plastic deformation of asperities contact temperature greater than 150 1C high pressure within the contact influence of lubricant chemistry presence of protective surface film effect of surface roughness, texture, and material properties.…”

Section: Scuffing and Catastrophic Wearmentioning

confidence: 99%

Fundamentals of ductile cast iron scuffing at the boundary lubrication regime

Wojciechowski

Eymard

Ignaszak

et al. 2015

Tribology International

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Section: Scuffing and Catastrophic Wearmentioning

confidence: 99%

Fundamentals of ductile cast iron scuffing at the boundary lubrication regime

Wojciechowski

Eymard

Ignaszak

et al. 2015

Tribology International

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“…The employed new four‐ball scuffing test exhibits a better resolution and is quicker and cheaper, and its precision is comparable to the precision of the standardised tests of the extreme pressure (EP) properties of lubricants . In particular, the new test is dedicated to testing lubricants of different chemical compositions …”

Section: Introductionmentioning

confidence: 87%

The potential of the application of biodegradable and non‐toxic base oils for the formulation of gear oils — model and component scuffing tests

Tuszyński

Szczerek

Michalczewski

et al. 2014

Lubrication Science

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White and natural base oils are assessed as candidates for the formulation of ecological gear oils. They are compared to ‘classical’ mineral and polyalphaolefins‐based oils in scuffing four‐ball and gear tests. Four fully formulated gear oils were prepared by blending each base oil with the package of extreme pressure (EP) additives, an anti‐foam additive and an anti‐oxidant. It is shown that the resistance to scuffing of the white oil is comparable to the classical oils, but the natural (rapeseed) oil reduces resistance to scuffing, because the used EP additives may not be suited to the rapeseed ‘matrix’ producing adverse effects. Thus, rapeseed‐based gear oils can be used only for the lubrication of gears working under moderate load conditions. It is also indicated that, when comparing the mechanisms of tribochemical action of the EP additives in the four‐ball tribosystem and meshing teeth, care should be taken, because the conditions in the contact zones are different. Copyright © 2014 John Wiley & Sons, Ltd.

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“…The average wear scar diameter (d) and limiting load of the wear (Goz) were determined at constant speed (1450 rpm) and constant load (392.4 N) during 3600‐second experiment. Anti‐seizure properties based on scuffing load (P t ) and limiting pressure of seizure (p oz ) were determined according to method described in literature . The scuffing load, describing the extreme‐pressure properties, was determined after the 18‐second runs at a constant rotational speed (500 rpm) and increasing load.…”

Section: Methodsmentioning

confidence: 99%

“…Anti-seizure properties based on scuffing load (P t ) and limiting pressure of seizure (p oz ) were determined according to method described in literature. [45][46][47] The scuffing load, describing the extremepressure properties, was determined after the 18-second runs at a constant rotational speed (500 rpm) and increasing load. The value of scuffing load was determined for steel-steel friction joint (100Cr6/100Cr6).…”

Section: Figure 1 Fatty Acid Esters Synthesised In This Studymentioning

confidence: 99%

Tribological characterisation of plant oil derived fatty acid esters of higher polyols: Comparative experimental study

Nowicki

Drabik

Woszczyński

et al. 2019

Lubrication Science

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In this paper, we present the study on the synthesis, physico‐chemical, and tribological characterisation of selected plant‐derived fatty acids esters of higher polyols. We described here more effective method synthesis of desired esters with high yields and high selectivities. In our novel and improved synthesis protocol, we applied homogeneous Sn catalysts. Physico‐chemical characterisation and lubricating properties of synthesised esters have been determined and discussed. Our results showed that the synthesised esters are characterised by excellent viscosity, good low temperature, and lubrication properties. High thermal resistance is the main benefit of synthesised esters. For fatty acid esters of trimethylolpropane dimer, onset temperatures are around 400°C and decomposition temperatures above 460°C, which makes these esters applicable in higher temperature.

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Effect of ageing automotive gear oils on scuffing and pitting

Cited by 34 publications

References 6 publications

Fundamentals of ductile cast iron scuffing at the boundary lubrication regime

Fundamentals of ductile cast iron scuffing at the boundary lubrication regime

The potential of the application of biodegradable and non‐toxic base oils for the formulation of gear oils — model and component scuffing tests

Tribological characterisation of plant oil derived fatty acid esters of higher polyols: Comparative experimental study

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