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Tribological properties of Cyanex 301‐modified MoS 2 nano‐sized hollow spheres in liquid paraffin

Tribological properties of Cyanex 301‐modified MoS 2 nano‐sized hollow spheres in liquid paraffin Purpose – The purpose of this paper is to investigate the tribological properties of MoS 2 nano‐sized hollow spheres in liquid paraffin (LP) and the corresponding action mechanism. Morever, its feasibity of industrial application as an oil additive in the industrial lubrication field is also explored. Design/methodology/approach – The tribological properties of MoS 2 nano‐sized hollow spheres (NH‐MoS 2 ) modified by Cyanex 301(di‐(2,4,4‐trimethylpentyl) dithiophosphinic acid) with size of 200 ∼ 300 nm in LP are studied and compared with those of the commercial colloidal MoS 2 (CC‐MoS 2 ) on a four‐ball tester and an Optimol SRV Oscillating friction and wear tester in a ball‐on disk configuration. The worn surfaces of the lower flat disc are examined with a scanning electron microscopy and an X‐ray photoelectron spectroscopy, respectively. Findings – Results show that NH‐MoS 2 is a better extreme‐pressure additive and anti‐wear (AW) and friction‐reducing additive in LP than CC‐MoS 2 . Under the optimum concentration of 0.5 per cent for both NH‐MoS 2 and CC‐MoS 2 and the load of 400 N, the friction coefficient of NH‐MoS 2 + LP and CC‐MoS 2 + LP decreases about 43.8 and 6.3 per cent, and the wear volume loss decreases about 60.3 and 12.0 per cent compared with the pure LP. The boundary lubrication mechanism for NH‐MoS 2 + LP can be deduced as the effective chemical adsorption protective film formed by the long chain alkyls R and active elements (S and P) in the modification layer and tribochemical reaction film containing the tribochemical products of the additive. Moreover, sliding and rolling frictions co‐exist in NH‐MoS 2 + LP, doing contributions to the good tribological properties as well. Originality/value – In this paper, the Cyanex 301‐modified MoS 2 nano‐sized hollow spheres with diameter of 200 ∼ 300 nm are firstly added into LP to investigate its tribological properties. The excellent AW and friction‐reducing properties indicate that this MoS 2 hollow spheres product is a good oil additive, and the fundamental data presented here will be useful for its further industrial application in the future. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

Tribological properties of Cyanex 301‐modified MoS 2 nano‐sized hollow spheres in liquid paraffin

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Publisher
Emerald Publishing
Copyright
Copyright © 2008 Emerald Group Publishing Limited. All rights reserved.
ISSN
0036-8792
DOI
10.1108/00368790810871075
Publisher site
See Article on Publisher Site

Abstract

Purpose – The purpose of this paper is to investigate the tribological properties of MoS 2 nano‐sized hollow spheres in liquid paraffin (LP) and the corresponding action mechanism. Morever, its feasibity of industrial application as an oil additive in the industrial lubrication field is also explored. Design/methodology/approach – The tribological properties of MoS 2 nano‐sized hollow spheres (NH‐MoS 2 ) modified by Cyanex 301(di‐(2,4,4‐trimethylpentyl) dithiophosphinic acid) with size of 200 ∼ 300 nm in LP are studied and compared with those of the commercial colloidal MoS 2 (CC‐MoS 2 ) on a four‐ball tester and an Optimol SRV Oscillating friction and wear tester in a ball‐on disk configuration. The worn surfaces of the lower flat disc are examined with a scanning electron microscopy and an X‐ray photoelectron spectroscopy, respectively. Findings – Results show that NH‐MoS 2 is a better extreme‐pressure additive and anti‐wear (AW) and friction‐reducing additive in LP than CC‐MoS 2 . Under the optimum concentration of 0.5 per cent for both NH‐MoS 2 and CC‐MoS 2 and the load of 400 N, the friction coefficient of NH‐MoS 2 + LP and CC‐MoS 2 + LP decreases about 43.8 and 6.3 per cent, and the wear volume loss decreases about 60.3 and 12.0 per cent compared with the pure LP. The boundary lubrication mechanism for NH‐MoS 2 + LP can be deduced as the effective chemical adsorption protective film formed by the long chain alkyls R and active elements (S and P) in the modification layer and tribochemical reaction film containing the tribochemical products of the additive. Moreover, sliding and rolling frictions co‐exist in NH‐MoS 2 + LP, doing contributions to the good tribological properties as well. Originality/value – In this paper, the Cyanex 301‐modified MoS 2 nano‐sized hollow spheres with diameter of 200 ∼ 300 nm are firstly added into LP to investigate its tribological properties. The excellent AW and friction‐reducing properties indicate that this MoS 2 hollow spheres product is a good oil additive, and the fundamental data presented here will be useful for its further industrial application in the future.

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: May 2, 2008

Keywords: Friction; Wear; Lubrication; Surface treatment

References