Investigation of lubricating properties of the lubricating oil added Fe₃O₄ nanoparticles in the hot extrusion of LY12

The surface-modified Fe₃O₄ nanoparticles were prepared using chemical method. The size and shape distribution of the nanoparticles were studied by transmission electron microscopy. The load-bearing capacity of the lubricating oil added Fe₃O₄ nanoparticles was evaluated with a four-ball tester. Lubricating properties of the lubricating oil added Fe₃O₄ nanoparticles were investigated in the hot extrusion of LY12 using an electron omnipotence tester. The experimental results indicate that the average diameter of the OA-coated Fe₃O₄ particles having good dispersion capacity in oil is about 10 nm, and the shape of the prepared nanoparticles is approximately spherical. The load-bearing capacity of the lubricating oils added nanoparticles can be improved obviously. Compared with the lubricating effect of micron-size graphite powder as lubricating oil additive, Fe₃O₄ nanoparticles not only can strikingly reduce hot extrusion force, but also can improve the surface finish of the hot - extruded workpiece.