Comparison of unidirectional and reciprocating tribometers in tests with MoDTC-containing oils under boundary lubrication

Balarini, Roberto; Diniz, G.A.S.; Profito, Francisco J.; Souza, R.M.

doi:10.1016/j.triboint.2019.03.044

Cited by 26 publications

(17 citation statements)

References 36 publications

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“…Such is the case presented by [38], who investigated the tungsten carbide compounds implemented in cutting tools, with the aim of finding the appropriate particle sizes that, when added in the tool forming process, allow reducing the wear and therefore increase the useful life of the tools. In Figure 8, the tribometer used by [16], which is an SRV-4 from Optimol Instruments Prüftechnik GmbH, is shown, with a schematic illustrating the reciprocating movement analyzed and a commercial SRV4® tribometer used by [39] where authors were intended to simulate the wear presented in the metal forming process, where due to high temperatures and forces affected the damaged data will fail, which affects the surface quality and adjustments of the pieces. Table 6 compiles additional studies where the pin-on-plate tribometer was used.…”

Section: Ivv Pin On Plate Tribometermentioning

confidence: 99%

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TRIBOMETRY: How is friction research quantified? A review

Valdes¹,

Marín²,

Rodriguez-Cabal³

et al. 2020

International Journal of Engineering Research and Technology

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Section: Ivv Pin On Plate Tribometermentioning

confidence: 99%

“…Photograph of pin-plate tribometer, and schematic representation of the recreated tribological system. Taken from [16] and [39].…”

Section: Ivv Pin On Plate Tribometermentioning

confidence: 99%

TRIBOMETRY: How is friction research quantified? A review

Valdes¹,

Marín²,

Rodriguez-Cabal³

et al. 2020

International Journal of Engineering Research and Technology

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“…Organic molybdenum has long been applied as an effective additive for reducing friction [ 1 – 4 ], which shows significant friction reduction performance in steel, iron and other surface [ 5 , 6 ]. Therefore, it draws extensive attention for the study on friction reduction mechanism.…”

Section: Introductionmentioning

confidence: 99%

Tribological performance of organic molybdenum in the presence of organic friction modifier

et al. 2021

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The tribological performance of organic molybdenum in the present of organic friction modifier was investigated in this study. Three types of organic friction modifiers were selected, which are Glycerol monooleate, Pentaerythritol and N,N-Dimethylhexadecylamine. The organic molybdenum are MoDTC, MoDDP and molybdenum amide. Friction coefficient and wear were studied in block-on-ring test rig with steel test specimens. Experimental results indicate the Pentaerythritol shows synergistic effect with MoDTC in wide range temperature, while increased the friction coefficient of molybdenum amide in high temperature. N,N-Dimethylhexadecylamine shows synergistic effect with molybdenum amide, while hindered the friction reduction performance of MoDTC in low temperature. The presence of Glycerol monooleate reduced friction coefficient of MoDTC in low temperature, while increased the friction coefficient of molybdenum amide in most situations. All the tested organic friction modifiers improved the friction reduction performance of MoDDP. Most of the tested organic friction modifiers reduced the wear of organic molybdenum. The PT shows the best anti-wear performance with MoDTC. The tribo-chemical products in test specimens lubricated with different lubricant formulas indicate that the presences of Pentaerythritol promotes the production of MoS2 in MoDTC. N,N-Dimethylhexadecylamine promotes the production of MoS2 in molybdenum amide. The side products of MoO1.6S1.6 and Cr/MoS2 of MoDDP in high temperature lead to high friction coefficient.

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“…MoDTC is found to be beneficial for engine lubrication; in the boundary lubrication regime MoDTC chemical bonds rupture and form 2D lateral MoS2 nano-sheets. Due to MoS2 sheet formation in the tribological contact area, the reduction of the coefficient of friction values occurs [10][11][12][13][14]. MoDTC decomposition and MoS2 tribofilm formation can be influenced by many factors like oil formulation chemistry [14,15], tribological contact conditions such as surface roughness [16], texturing [17,18], temperature [12] and interacting surface materials [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…14 show the MoS2 tribofilm distribution on disk sample wear scars tested using FF oil 1, FF oil 2 and FF oil 3 respectively.Fig.12. a) shows that the smallest area coverage, occurred in low speed and low MoDTC concentration test conditions.…”

mentioning

confidence: 99%