Wear prevention behaviour of nanoparticle suspension under extreme pressure conditions

This source preferred by Antolin Hernandez Battez

Authors: Hernandez Battez, Hernandez Battez, A., Gonzalez, R., Felgueroso, D., Fernandez, J.E., Fernandez, M.R., Garcia, M.A. and Pe├▒uelas, I.

Start date: 16 April 2007

This work presents and discusses the extreme-pressure behaviour of nanopartic le suspensions in a polyalphaolefin (PAO 6). CuO, ZnO and ZrO2 nanopartic les were dispersed at 0.5, 1.0 and 2.0% wt. in PAO 6 using an ultrasonic probe during 2 minutes and EP properties were obtained using a Stanhope Seta Shell Four-Ball EP Lubricant Tester according to ASTM D 2783-88. The ball test material was AISI 52100 steel of 12.7 mm. diameter, with a hardness of about 65 HRC. The wear scar diameter (WSD) was measured with an optical microscope and SEM and EDS analysis of the worn surface highlighted a number of conclusions: all concentrations of nanoparticles improved the EP properties of PAO 6; CuO nanoparticles exhibited the best EP behaviour and ZrO2 the worst; CuO and ZnO suspensions showed better results at 0.5% and 2.0% wt. of nanoparticles, respectively, while ZrO2 behaved identically regardless of nanoparticle concentration; all results were analysed according to the nanoparticles┬┤ size and hardness, and their deposition on wear scar surface.

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