Surface characterization of steel/steel contact lubricated by PAO6 with novel black phosphorus nanocomposites

Luo, Zhiheng; Yu, Jingyuan; Xu, Yufu; Xi, He; Cheng, Gang; Yao, Lulu; Song, Ruhong; Dearn, Karl D.

doi:10.1007/s40544-020-0366-3

Cited by 39 publications

(19 citation statements)

References 36 publications

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“…Nevertheless, few studies have considered the effect of automatic transmission fluid (ATF) temperature on the running-in. Fundamental studies into the ATF temperature effect mainly focused on its influence in the steady-state phrase, like on the tribological behaviour (Wu et al, 2018a(Wu et al, , 2018bXu et al, 2019;Luo et al, 2021), drag torque (Wu et al, 2018a(Wu et al, , 2018bIqbal et al, 2013) and the temperature field of friction components (Lin et al, 2018;Kumar et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Effect of ATF temperature on the friction-wear characteristic of a wet multi-disc clutch during the running-in process

Wang

Zheng

et al. 2022

ILT

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Purpose This paper aims to explore the effect of automatic transmission fluid (ATF) temperature on the dynamic friction-wear properties of the friction component in a wet multi-disc clutch during the running-in process. Design/methodology/approach The running-in evolution was explored in terms of global friction performance and instantaneous friction characteristics. The variation of friction torque of the initial 300 engagement cycles was obtained by wet-clutch tests. Finally, an optical microscope was used to detect the wear mechanism of friction surfaces. Findings The ATF temperature showed a significant effect on the friction-wear performance in the clutch running-in process. The mean coefficient of friction decreased with the increase of the ATF temperature and decreased rapidly in the approximately initial 60 clutch engagements. The higher the ATF temperature was, the thinner the ATF film was, and more asperity summits were cut, thus leading to a smoother surface. Considering the slightly instantaneous friction fluctuation and the wear performance, a proper ATF temperature is necessary. Originality/value The results provide theoretical guidance for selecting the optimal ATF temperature during the running-in process.

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Section: Introductionmentioning

confidence: 99%

Effect of ATF temperature on the friction-wear characteristic of a wet multi-disc clutch during the running-in process

Wang

Zheng

et al. 2022

ILT

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“…Although lots of research studies have been done for the temperature-sensitive performances of PNIPAM microgels, accurate adjustment of the critical temperature of volume phase transition and their lubrication behavior for titanium alloy are still out of control (Sierra-Martin et al , 2014; Cao-Luu et al , 2019; Thiele et al , 2021). In previous work, several nano-additives have been used to control the lubrication performance of tribopairs (Xu et al , 2019a, 2019b; Luo et al , 2021; Xu et al , 2021; Bao et al , 2022). In this work, the surfactant-free emulsion polymerization method was used to prepare PNIPAM microgels with different particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and temperature-sensitive lubrication behavior of PNIPAM microgels for titanium alloy

Sun

Zheng

et al. 2022

ILT

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Purpose This paper aims to offeri novel nano-additives polymer microgels to precisely improve the lubrication properties of titanium alloy under different temperatures. Design/methodology/approach The surfactant-free emulsion polymerization method was used to prepare Poly(N-isoprolylacrylamide) (PNIPAM) microgels. A ball-on-disk tribometer was applied to investigated the temperature-sensitive lubrication behavior of PNIPAM microgels. Findings The results show that the as-prepared microgels are ball-like nanoparticles with the size of 50–900 nm. In addition, potassium persulfate as initiator, complete mixing technic and high sodium dodecyl sulfate (SDS) concentration contribute to the formation of microgels with small size. The tribosystem shows a lower friction coefficient with the lubrication of PNIPAM microgels as aqueous solution additives when the temperature exceeding the critical temperature. Originality/value This work reports the temperature-sensitive lubrication of PNIPAM microgels. The critical temperature of PNIPAM microgels could be regulated by the addition of SDS in the solutions. This offers an effective and facile strategy for regulation of the critical temperature of smart microgels, which is helpful for the smart lubrication in the future.

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“…Then, it was further developed from gas path to the tribo-contracts [18][19][20][21]. After a series of experimental works on sliding rolling and bearing wear systems, it has been demonstrated that this novel technique has considerable advantages in condition monitoring of tribological systems with its high sensitivity and resolution [22][23][24][25][26][27][28][29][30][31][32]. Unlike monitoring the traditional secondary effects such as temperature and vibration, electrostatic sensing technique is considered as a direct measurement for friction and wear.…”

Section: Introductionmentioning

confidence: 99%

Research on Characteristics of Electrostatic Wear-Site and Oil-Line Sensor with Theoretical and Comprehensive Analysis

et al. 2022

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As a unique monitoring technique, electrostatic monitoring has been proved to be effective on prognostics and health management of tribological system by using electrostatic sensors. Wear-site sensor (WSS) with a flat circle probe and oil-line sensor (OLS) with a ring probe are two typical sensor types for electrostatic monitoring. However, this developing technique has not been applied in actual industry manufacture so far due to the united characteristics on electrostatic sensors. This paper first presents the mathematical models of both WSS and OLS for theoretical simulation. Then a series of contrast analysis on sensor characteristics between WSS and OLS with varied sensor structure parameters are presented. The results show that the distributions of spatial sensitivity for WSS or OLS itself only are similar, while they are quite different between WSS and OLS. Both WSS and OLS are symmetrical and their distributions can be simplified in one phase for further investigations. The theoretical efficiency curves have close relationship between WSS and OLS. The investigations of sensor performances on characteristics and a presented unified three level system have offered a better electrostatic sensor application in future.

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Surface characterization of steel/steel contact lubricated by PAO6 with novel black phosphorus nanocomposites

Cited by 39 publications

References 36 publications

Effect of ATF temperature on the friction-wear characteristic of a wet multi-disc clutch during the running-in process

Effect of ATF temperature on the friction-wear characteristic of a wet multi-disc clutch during the running-in process

Synthesis and temperature-sensitive lubrication behavior of PNIPAM microgels for titanium alloy

Research on Characteristics of Electrostatic Wear-Site and Oil-Line Sensor with Theoretical and Comprehensive Analysis

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