Study of the influence of the parameters of the TI-C-Al-SiO2-Al2O3-Fe2O3-PT-NA-01 charge stock mechanical activation on the duration of the modifying composites synthesis

Abstract

Abstract. Problem. The paper is devoted to one of the urgent problems of modern materials science – the creation of materials with predetermined properties, methods of their production and practical application. Goal. This work is devoted to the study of the influence of mechanical activation parameters on the synthesis duration and morphology of the Ti-C-Al-SiO2-Al2O3-Fe2O3-PT-NA-01 charge intended for the production of a modifying composite material obtained by self-propagating high-temperature synthesis. Methodology. Powders Ti, C, Al, SiO2, Al2O3, Fe2O3, PT-NA-01 are used as starting materials. Mechanical activation of the charge with variation of process parameters was carried out in a ball mill of the KM-1 model, developed by the authors of this work, of the intermittent principle of operation with a working steel drum volume of 1.5‧10-4m3. The ball mill weighs 5.8 kg and has dimensions (W-H-D) of 190-180-230 mm. The duration of mechanical processing of the charge was from 1 to 25 minutes, with a drum rotation speed of 50 to 180 rpm. The ratio of the charge weight to the grinding media weight (steel balls with a diameter of 6 mm) was 1 : 20 and 1 : 40. Results. Studies have established that the recommended mode of mechanical activation of the Ti-C-Al-SiO2-Al2O3-Fe2O3-PT-NA-01 charge is treatment for 15 minutes at a drum rotation speed of 130 rpm and a ratio of 1:40 charge weight to steel ball weight. The particle size distribution of the charge is reduced from a maximum size of 100 microns to 40 microns. Originality. Based on the studies conducted, it can be concluded that such treatment of this charge leads to an increase in the chemical activity of the components and increases the efficiency of the SHS process by reducing the duration of its initiation and synthesis. Practical value. The developed modified composite material is recommended for arc surfacing and gas thermal spraying of strengthening and restoring coatings of machine parts.