Impact of liquid crystal additives on a canola oil-based bio-lubricant

Abstract

Vegetable oils can offer important environmental advantages with respect to biodegradability and renewability, as well as good performances in different applications. In this work, the rheological and tribological properties of an industrial canola oil-based bio-lubricant were investigated. They were compared with the properties of a mineral hydraulic lubricant used for similar applications. The tribological performance of the lubricants was investigated using a four-ball test and a pin-on-disk setup, and the rheological behavior was studied using oscillatory rheometry. The tested bio-hydraulic oil exhibited excellent lubricity. Liquid crystal additives affected the viscoelasticity differently. Moreover, the added ionic liquid crystal improved the wear resistance of the bio-hydraulic oil, but the original lubricant preserved the lowest coefficient of friction.

Keywords

Bio-lubricant liquid crystals canola oil tribology rheology wear friction

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References

Masjuki

Maleque

Kubo

. Palm oil and mineral oil based lubricants, their tribological and emission performance. Tribol Int 1999; 32: 305–314.

Jayadas

Prabhakaran Nair

Ajithkumar

. Tribological evaluation of coconut oil as an environment-friendly lubricant. Tribol Int 2007; 40: 350–354.

Sahoo

Biswas

. Frictional response of fatty acids on steel. J Colloid Interf Sci 2009; 333: 707–718.

Shen

Luo

Wen

. Nano-tribological properties and mechanisms of the liquid crystal as an additive. Chinese Sci Bull 2001; 46: 1227–1232.

Carrion

Martinez

Iglesias

. Liquid crystals in tribology. Int J Mol Sci 2009; 10: 4102–4115.

Bermudez

Martines

Carrion

. Tribological properties of liquid crystals as lubricant additives. Wear 1997; 212: 188–194.

Latyshev

Novikov

Syrbu

. Tribological properties of some cholesterical liquid, crystal additives. J Friction Wear 2010; 30: 411–414.

Amann

Kailer

. Analysis of the ultralow friction behavior of a mesogenic fluid in a reciprocating contact. Wear 2011; 271: 1701–1706.

Iglesias

Bermudez

Carrion

. Friction and wear of aluminium steel contacts lubricated with ordered fluids - neutral and ionic liquid crystals as oil additives. Wear 2004; 256: 386–392.

10.

Jimenez

Bermudez

Carrion

. Room temperature ionic liquids as lubricant additives in steel-aluminium contacts. Wear 2006; 261: 347–359.

11.

Deshmukh

Lovell

Sawyer

. On the friction and wear performance of boric acid lubricant combinations in extended duration operations. Wear 2006; 260: 1295–1304.

12.

Cazin

Tequi

Lesieur

. A screening test for anti-wear additives in a modified four-ball test. Tribotest 1997; 4: 145–158.

13.

Standard Test Method for Wear Preventive Characteristics of Lubricating Fluid (Four-Ball Method), Active Standard ASTM D4172, Developed by Subcommittee: D02.L0.11, Book of Standards Volume: 05.02.

14.

Dorinson

. The nature of the wear process in the four-ball lubricant test. Wear 1981; 68: 109–127.

15.

Bhushan

. Introduction to tribology, New York: John Wiley & Sons, 2002.

16.

Wright

Jain

Saba

. Wear rate calculation in the four-ball wear test. Wear 1989; 134: 321–334.

17.

Boucherit

Lahmar

Bou-Saïd

. Comparison of non-Newtonian constitutive laws in hydrodynamic lubrication. Tribol Lett 2010; 40: 49–57.

18.

Williamson

Walters

Bates

. The viscoelastic properties of multigrade oils and their effect on journal-bearing characteristics. J Non-Newtonian Fluid Mech 1997; 40: 115–126.

19.

Georges

Martin

Mathia

. Mechanism of boundary lubrication with zinc dithiophosphate. Wear 1979; 53: 9–34.

20.

Topolovec-Miklozic

Forbus

Spikes

. Film thickness and roughness of ZDDP antiwear films. Tribol Lett 2007; 26: 161–171.

21.

Cheng

. Influence of chain ordering on frictional properties of self-assembled monolayers (SAMs) in nano-lubrication. Adv Colloid Interf Sci 2012, pp. 171–172.