THERMODYNAMIC ANALYSIS OF THE SYSTEMS: FERRUM-NICKEL-TITANIUM-NITROGEN AND NICKEL-CHROME-TITANIUM-NITROGEN
The purpose of the study. Agricultural machinery operates in difficult conditions. Dust, dirt, snow, rain getting into the friction surface units cause increased mechanical wear. As a result of these reasons, parts and entire units lose their initial strength and fail prematurely, causing great material damage to agricultural producers. Methodology. Therefore, an important issue is the development and subsequent manufacture of agricultural machinery parts with a complex of properties: high hardness, strength, wear resistance and the ability to resist abrasive wear and at the same time not be expensive to manufacture. The manufacture of parts from metal powders, or rather from carbidosteels, is an urgent and promising task. Carbidosteels are materials consisting of alloyed steels or metal powders and carbides with a weight fraction of 20 to 70 %. Titanium carbide is used as a solid component for carbide steels, being the most common and cheapest. According to their mechanical properties, carbide steels occupy an intermediate place between hard alloys and steels. Powder parts (of carbidosteels) are prepared by the following methods: 1) mixing various metal powders together with a plasticizer and then being pressed in a mold; 2) fabricating powder parts by impregnation. Results . The process of carbide carcass formation is investigated to provide manufacturing strong carbide compacts preserving the dimensions during impregnation when obtaining the finished product. The obtained parts had high mechanical properties. Scientific novelty. For the first time, the parts were obtained by impregnation with steel wastes of a certain chemical composition, which ensure free separation of the remaining metal after impregnation and keep the shape of the parts. The thermodynamic analysis performed makes it possible to determine the required content of alloying steel elements used to manufacture the part.