Tribological properties of amorphous hydrogenated (a-C:H) and hydrogen-free tetrahedral (ta-C) diamond-like carbon coatings under jatropha biodegradable lubricating oil at different temperatures

Mobarak, H.M.; Masjuki, H.H.; Mohamad, Edzrol Niza; Kalam, M.A.; Rashedul, H.K.; Rashed, M.M.; Habibullah, M.

doi:10.1016/j.apsusc.2014.08.168

Cited by 24 publications

(16 citation statements)

References 42 publications

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“…Besides, Raman spectra with typical amorphous carbon characteristics were observed on wear scar, and compared with as‐deposited coating, noted that higher I D / I G ratio (from 0.831 to 0.995 and 1.086, respectively) and G peak position (from 1553 to 1581 and 1562 cm −1 , respectively) were observed from the wear scar surface under both conditions. The results demonstrated that a friction‐induced graphitized carbon layer was formed and transferred from wear track to steel ball due to the easily shear characteristics of the graphite‐like lamellar structure, which will not be affected by PAO oil …”

Section: Resultsmentioning

confidence: 96%

“…In general, graphitization may occur in the tribological contact because of friction‐induced heating under contact and high contact stress . And the formation of graphitized carbon layer can cause an easy slip between the tribo pairs, thereby minimizing friction.…”

Section: Resultsmentioning

confidence: 99%

“…Raman spectroscopy was used to characterize evolution of carbon atomic bonds on the surface of the coatings and steel balls before and In general, graphitization may occur in the tribological contact because of friction-induced heating under contact and high contact stress. 26 And the formation of graphitized carbon layer can cause an easy slip between the tribo pairs, thereby minimizing friction. However, a higher degree of graphitization and the transfer of graphitized carbon layer will increase the consumption of coating and lead to high wear rate.…”

Section: Wear Track and Wear Scar Analysismentioning

confidence: 99%

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Tribological properties of Ti‐doped diamond‐like carbon coatings under dry friction and PAO oil lubrication

Guo

Sun

et al. 2018

Surface & Interface Analysis

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Titanium‐doped diamond‐like carbon (Ti‐DLC) coatings with Ti concentration of 4 at.% (Ti4at.%‐DLC) and 27 at.% (Ti27at.%‐DLC) were prepared by a hybrid ion beam deposition system for comparison. The tribological behaviors of Ti‐DLC coatings under dry friction and boundary lubrication conditions were systematically investigated. Results showed that, under dry friction, the Ti4at.%‐DLC coating displayed lower friction coefficient (0.07) and wear rate due to the continuous transfer film formed in the sliding interface, while Ti27at.%‐DLC coating was worn out at initial stage due to severe abrasive wear. And under boundary lubrication, both the Ti4at.%‐DLC and Ti27at.%‐DLC coatings showed excellent tribological properties attributing to the formation of oil film between sliding interface. In particular, Ti27at.%‐DLC performed the lowest wear rate of 1.12 × 10−16 m3 N−1 m−1 in this friction case. In conclusion, compared with Ti27at.%‐DLC coating, Ti4at.%‐DLC coating exhibited better tribological performances both under dry friction and boundary lubrication. The present result provides guidance for the selection of DLC coatings according to the realistic environment of starved‐oil and rich‐oil conditions.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Wear Track and Wear Scar Analysismentioning

confidence: 99%

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Tribological properties of Ti‐doped diamond‐like carbon coatings under dry friction and PAO oil lubrication

Guo

Sun

et al. 2018

Surface & Interface Analysis

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“…Vegetable oil-based lubricant formulations are becoming increasingly popular not only because of severe environmental concerns associated with use of conventional mineral oil-based lubricants [9], but also due to excellent lubricating properties of the former ones. Vegetable oilbased lubricants possess numerous desirable properties typically required in a high performance lubricant such as high viscosity index, elevated flash and fire point, low volatility and vapor pressure, and high lubricity leading to good anti-wear and friction reducing character [10].…”

Section: Introductionmentioning

confidence: 99%

Friction and wear behavior of karanja oil derived biolubricant base oil

Sharma

Sachan

2019

SN Appl. Sci.

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This work deals with the tribological performance of karanja oil trimethylolpropane ester (KOTMPE) biolubricant base oil for its probable application as automotive lubricant. The biolubricant was synthesized by transesterification of karanja oil methyl ester with trimethylolpropane (TMP) under acid catalyst. The study was made with Ducom TR30L four-ball tester at 1200 rev min −1 speed and 75 °C temperature over 60 min duration under normal loads of 15 kg and 40 kg as per ASTM D 4172-94 A and B standard test method. Principal results at two loads are given here: Coefficient of friction (CoF) 0.100 and 0.042, wear scar diameter (WSD) 0.30 mm and 0.44 mm, flash temperature parameter (FTP) 80.932 and 126.249, and thermal energy (TE) 0.054 J and 0.060 J, respectively. The study found that KOTMPE has lowest CoF than any vegetable oil, TMP ester or commercial lubricant. Similarly, the WSD was lowest among all the vegetable oil based lubricants and was at par with SAE 20W-50 and SAE 40 commercial lubricants. FTP was better compared to any vegetable oil or TMP ester. Finally, the energy efficiency of KOTMPE was better than that of other vegetable oils, TMP esters and mineral lubricants. The synthesized ester demonstrated the outstanding performance in terms of friction and wear characteristics along with high thermal stability and energy efficiency worthy of comparison with multiple lubricating products reported by different research groups in available literature during last two decades.

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“…4 Moreover, there are many environmental and health issues associated with the excessive use of petroleum-based fuels and lubricants, which include air pollution, soil contamination, and difficult waste management. 5 Therefore, there is a need to reduce our reliance on conventional lubricants and shi towards environmentally sustainable, renewable, and biodegradable lubricants. 6 A considerable improvement in the tribological performance of mechanical components operating under a boundarylubrication regime can be achieved by depositing hard coatings such as diamond-like carbon (DLC) coatings.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the tribochemical interactions of a tungsten-doped diamond-like carbon coating (W-DLC) with formulated palm trimethylolpropane ester (TMP) and polyalphaolefin (PAO)

et al. 2017

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Tribological properties of amorphous hydrogenated (a-C:H) and hydrogen-free tetrahedral (ta-C) diamond-like carbon coatings under jatropha biodegradable lubricating oil at different temperatures

Cited by 24 publications

References 42 publications

Tribological properties of Ti‐doped diamond‐like carbon coatings under dry friction and PAO oil lubrication

Tribological properties of Ti‐doped diamond‐like carbon coatings under dry friction and PAO oil lubrication

Friction and wear behavior of karanja oil derived biolubricant base oil

Investigation of the tribochemical interactions of a tungsten-doped diamond-like carbon coating (W-DLC) with formulated palm trimethylolpropane ester (TMP) and polyalphaolefin (PAO)

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