On the possibility of processing composite intermetallic-based powders with solid lubricants

摘要

Structure and phase composition of powders based on nickel and iron aluminides with solid lubricants produced using exothermal effect of metals interaction have been investigated. In spite of relatively low exothermal effects of iron aluminides formation, intensive degradation of molybdenum and tungsten disulfide followed by formation of FeS_2 и Al_2S_3 take place during the synthesis of iron aluminides based powders. When adding the carbon-containing solid lubricant, some content of carbon reacts with iron, forming Fe3C carbide. No chemical interaction of metals with the investigated solid lubricant components was observed during the synthesis of nickel aluminide based powders. Disulfide inclusions are located both in periphery and in the volume of composite NiAl/MoS_2 particles providing the finer volume distribution of solid lubricants as compared with two-step processing of tribotechnical compositions including the synthesis of intermetallics with the following admixing of solid lubricants.