BORON NITRIDE AS ADDITIVE IN RAPESEED OIL, TESTED ON FOUR BALL TESTER

This paper presents the influence of BN as additive in refined rapeseed oil in a mass concentration of 1%wt on the tribological parameters. Tests are done on a four-ball machine. The test parameters were load: 100 N...300 N and the the sliding speeds of 0.38 m/s, 0.53 m/s and 0.69 m/s, respectively. Particles of hexagonal BN have 500 ± 100 nm. The rapeseed oil was supplied by Expur SA Bucharest. For the tested ranges of the parameters, the additivation of rapeseed oil with BN does not improve the friction coefficient, but the wear rate of WSD seems to be less sensitive for the more severe regimes when the vegetal oil is additivated. The additivation of rapeseed oil with BN is still efficient for the tested ranges of load and speed as compared to the neat rapeseed oil, but there is visible that friction coefficient and analysed wear parameter are less influenced by the regime for the concentration of 1% BN in rapeseed oil.