Antiwear and extreme pressure performance of castor oil with nano-additives

作者：Gupta Rajeev Nayan; Harsha A. P.^*

来源：Proceedings of the Institution of Mechanical Engineers - Part J: Journal of Engineering Tribology , 2018, 232(9): 1055-1067.

DOI：10.1177/1350650117739159

• Antiwear
• antifriction
• extreme pressure
• nanoparticle
• additive

The aim of the present study is to examine the antiwear, antifriction, and extreme pressure performance of castor oil with nano-additives by using a four-ball tester. CeO2 (approximate to 90 nm) and polytetrafluroethylene ( approximate to 150 nm) nanoparticles were used as an additive in castor oil with four different concentrations in the range of 0.1-1.0% w/v. The suspension stability of the nanoparticles was improved by using sodium dodecyl sulfate as a dispersant. Different analytical tools were used to characterize the nanoparticles parameter (i.e. shape and size) as well as the worn surfaces. The additive concentration was optimized on the basis of tribological performance. The test results of antiwear and extreme pressure property have been reported on the basis of wear scar diameter and weld load, respectively. For the antiwear test, it was observed that the maximum reduction in the wear scar diameter was 37.4 and 35.3% at an optimum concentration of CeO2 and polytetrafluroethylene additive, respectively. Also, antifriction and load carrying properties of castor oil were significantly improved with the addition of nanoparticles as an additive in a small amount. The mechanism for such improvement in the tribological behavior has also been discussed.

• 出版日期2018-9