TRIBOTECHNICAL MATERIALS FOR THE MAINTENANCE OF AGRICULTURAL MACHINERY

Abstract

Research and development of domestic artificial preventive and repair-restoration tribopreparations is an urgent task. (Research Purpose) The research purpose is evaluating the prospects for the use of boehmite as a preventive and repair-restoring additive. (Materials and methods) Nanostructured boehmite obtained by hydrothermal synthesis from industrial aluminum powders was used. The boehmite was rubbed with a surfactant and the suspension was treated by ultrasound. The D-243 diesel engine was run-in on the KI-3540-GOSNITI run-in stand and the gearbox of the mobile drilling rig. Tribotechnical studies were carried out on the friction machine model 2070 SMT-1M and on the upgraded friction machine model 77MT-1M. (Results and discussion) The working oil with the addition of boehmite reduces the time of complete running-in of the cylinder-piston group of diesel and the run-in wear. For gearbox parts, the composition containing diesel waste oil, kaolin, talc, boehmite and surfactants showed the best results. The efficiency of running-in depends not only on the physical and chemical properties of the additive components, but also on the particle size of the components and the surface roughness of the lapped parts. Tribotechnical studies have shown that the introduction of boehmite into oils reduces the friction coefficient, slows down the wear rate of resource interfaces during operation. The article presents a scheme explaining the increase in resource by reducing the running-in time and wear rate. According to many physicochemical properties (dispersion, dehydration temperature, hardness, ability to form chemical compounds and solid solutions with iron oxides, catalytic properties), boehmite is similar to serpentine, which makes it promising for repair and restoration applications. (Conclusions) Nanostructured boehmite of hydrothermal synthesis serves as an effective pre-production and preventive additive, promising and as a repair and restoration.