Experimental study on tribological property of MoS₂ nanoparticle in castor oil

In this paper, the antiwear and antifriction performance of MoS₂ nanoparticle in castor oil was studied. The ball-on-disc tests were performed for different concentrations of MoS₂ nanoparticle. Coefficient of friction, wear loss, and worn surface morphology were investigated. The results show that MoS₂ nanoparticle could reduce the possibility of asperities direct contact, resulting in the reduction of the coefficient of friction and adhesive wear. However, MoS₂ nanoparticle in excessive concentration could agglomerate into large particles, playing the role of an abrasive particle, which reduces the beneficial effects of MoS₂ nanoparticle.