Tribological investigations on MoS 2 -based nanolubricant for machine tool slideways

Abstract

The present study evaluates the tribological characteristics of molybdenum disulphide (MoS₂)-based nanolubricant for its use in machine tool slideways. MoS₂ nanoparticles were synthesized and physical characterization was carried out using scanning electron microscope and transmission electron microscope. The nanolubricants were prepared by adding various proportions of MoS₂ nanoparticles in polyalphaolefin base oil with lecithin as dispersant. Friction, wear, and stick-slip characteristics of the nanolubricants were assessed using a pin-on-block reciprocating friction monitor simulating the actual loading conditions prevailing in machine tool slideways. Extreme pressure properties of the lubricants were determined using a four ball tester. The wear surfaces were analyzed using scanning electron microscopy and energy-dispersive spectroscopy. The results of the studies were compared with ISO VG 32, a conventional lubricant used in machine tool slideways, and it was found that the addition of MoS₂ nanoparticles in polyalphaolefin base oil results in approximately 24% reduction in coefficient of friction and an increase in load-carrying capacity. The mechanism behind the improvement in tribological behavior of MoS₂-based nanolubricant is most likely the formation of a thin, MoS₂ tribofilm at the wear surface.

Keywords

Nanolubricant machine tool slideways anti-friction extreme pressure properties

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References

Xue

Liu

Zhang

. Friction and wear properties of a surface-modified TiO₂ nanoparticle as an additive in liquid paraffin. Wear 1997; 213: 29–32.

Ghaednia

Jackson

. The effect of nanoparticles on the real area of contact, friction and wear. J Tribol 2013; 135(4): 041603–041603.

Liu

Qin

. Investigation of the mending effect and mechanism of copper nano-particles on a tribologically stressed surface. Tribol Lett 2004; 17: 961–966.

Zhao

. The ball-bearing effect of diamond nanoparticles as an oil additive. J Phys D: Appl Phys 1996; 29: 2932–2937.

Qiu

Dong

Chen

. Tribological properties of CeF₃ nanoparticles as additives in lubrication oils. Wear 1999; 230: 35–38.

Rapoport

Leshchinsky

Lapsker

. Tribological properties of WS₂ nanoparticles under mixed lubrication. Wear 2003; 255(7): 785–793.

Ghaednia H, Jackson RL and Khodadadi JM. Experimental analysis of stable CuO nanoparticle enhanced lubricants. J Exp Nanosci 2015; 10(1): 1–18.

Greenberg

Halperin

Etsion

. The effect of WS 2 nanoparticles on friction reduction in various lubrication regimes. Tribol Lett 2004; 17(2): 179–186.

Wang

Liu

. Tribochemistry and antiwear mechanism of organic–inorganic nanoparticles as lubricant additives. Tribol Lett 2006; 22(1): 79–84.

10.

Ghaednia

Babaei

Jackson

. The effect of nanoparticles on thin film elasto-hydrodynamic lubrication. Appl Phys Lett 2013; 103(26): 263111–263111.

11.

Chou

Viesca

Hernandez Battez

. Tribological behavior of polyalphaolefin with the addition of nickel nanoparticles. Tribol Int 2010; 43: 2327–2332.

12.

Qiu

Zhou

. Preparation of Ni nanoparticles and evaluation of their tribological performance as potential additives in oils. J Tribol 2001; 123: 441–441.

13.

Liu

. Enhancing AW/EP property of lubricant oil by adding nano Al/Sn particles. Tribol Lett 2005; 18: 85–90.

14.

Liu

Chen

. An investigation of the tribological behaviour of surface-modified ZnS nanoparticles in liquid paraffin. Wear 2000; 238: 120–124.

15.

Viesca

Hernandez Battez

Gonzalez

. Antiwear properties of carbon-coated copper nanoparticles used as an additive to a polyalphaolefin. Tribol Int 2011; 44: 829–833.

16.

Suter

. Bulletin MRS, Pittsburgh, PA: The Materials Research Society Pittsburgh, 1991, pp. 24–24.

17.

Bai Y, Xing J, Ma S, et al. Effect of MoS₂ on the tribological properties of in situ Fe3Al-20 wt% Al2O3-4 wt% Cr composites. Proc IMechE, Part J: J Engineering Tribology 2013. DOI: 10. 1177/1350650113479249.

18.

Hampson

Roberts

Cropper

. Towards the effective solid lubrication of ball bearings operating at high temperature. Proc IMechE, Part J: J Engineering Tribology 2008; 222(8): 1041–1049.

19.

Verma

Jiang

Abu Safe

. Tribological behavior of deagglomerated active inorganic nanoparticles for advanced lubrication. Tribol Trans 2008; 51: 673–678.

20.

Shen

Shih

Malshe

. Performance of novel MoS₂ nanoparticles based grinding fluids in minimum quantity lubrication grinding. Trans NAMRI/SME 2008; 36: 357–364.

21.

Kalin

Kogovsek

Remskar

. Mechanisms and improvements in the friction and wear behavior using MoS₂ nanotubes as potential oil additives. Wear 2012; 280--281: 36–45.

22.

Cizaire

Vacher

Le-Mogne

. Mechanisms of ultra-low friction by hollow inorganic fullerene-like MoS₂ nanoparticles. Surf Coat Tehnol 2002; 160: 282–287.

23.

Liu

Wang

. Tribological properties of molybdenum disulphide nanosheets by nanolayer restacking process as additive in liquid paraffin. Tribol Int 2009; 42: 33–39.

24.

Chevron Philips Chemical Company. Safe handling and storage of synfluid, polyalphaolefins (PAO), 2008.

25.

Tsui

Liu

. Experimental analysis of tribological properties of lubricating oils with nanoparticle additives. Wear 2007; 262: 819–825.

26.

Joshi PH. Machine tools handbook - design and operation. New Delhi, India: Tata McGraw Hill Education Private Limited, 2007, pp.459–506.

27.

ASTM Standard D2783-03. Standard test method for measurement of extreme-pressure properties of lubricating fluids (four-ball method). West Conshohocken, PA: ASTM International; 2009.