Development and modification of nano-particles and tribological analysis of the lubricants with nano-particles

Abstract

The aim of the report is the creation and use of the suspensions of nano-particles of iron and other metals in different tribosystems solving the problems of friction and wear. Two methods of Fe-synthesis was chosen: synthesis in water matrix, the reduction of iron saline with hydrazine using active surface material (ASM) keeping the reducing atmosphere over the reactive surface liquid; Fe synthesis in inverted miceline solution of iron-water nitrate with participation of ASM using ultraviolet irradiation for reduction activating. Electron microscopy confirmtd the formation of nanoparticles with 30...50 nm dimension. The for-ball tests machine show that if the lubricating with mineral oil SAE40 modified by Fe (0,065 mass.%) and Fe + Cu (0,032% + 0,004%) nanoparticles the friction torque reduces from 1.2 (oil SAE 40+CuFe) to 1.6 (oil SAE 40+Fe) times. The wear spot size reduces twice as well. Mossbauer spectroscopy of the compounds of mineral oils with Fe nanoparticles shows the majority of iron is oxidized. After the tests the quantity of Fe (11) rises. Fe (III) forms for nonstahiometric nanocrystalline magnetite and Fe (II) units appear for interaction of Fe nanoparticles and oils.