EFFECT OF HEXAGONAL BORON NITRIDE WITH DIFFERENTPARTICLE GRANULATION ON THE LUBRICATION PROPERTIESOF MINERAL OIL WITH AN ADDITION OF SURFACTANTS

Abstract

This paper presents the results of tribological tests of lubricating compositions containing SN150 mineral oilas a base, an additive of solid lubricant in the form of hexagonal boron nitrides (h-BN) of various particlesizes (nano- and micro-) and surfactants: succinic acid imide and sodium di-2-ethylhexyl sulphosuccinate.Particular attention was paid to analysing the properties of hexagonal boron nitrides in the context of theireffect on the tribological properties of the friction node under study. The effects of h-BN particle size, shape,specific surface area and porosity were considered. In addition, tests were carried out to check the surfactants'effect on the tested oil's hexagonal boron nitride sedimentation process. These tests confirmed the positiveeffect of succinic acid imide on maintaining a stable dispersion of h-BN particles in SN-150 mineral oil.Tribological tests were performed on a T-02 tribotester based on the PN-EN ISO 20623:2018-02 standard.The positive effect of hexagonal boron nitride on the lubricating properties of mixtures with SN150 mineraloil was established. In addition, hexagonal boron nitride, with a smaller particle size and a more developedporous structure, had a more favourable effect on improving the lubricity properties evaluated on the T-02tribotester.