OBTAINING AND STUDYING THE PROPERTIES OF IRON AND SILICON-CONTAINING MAX-PHASES BY THE METHOD OF SELF-PROPAGАТING HIGH-TEMPERATURE SYNTHESIS

Abstract

The paper discusses the preparation and properties of a new class of multifunctional composites, which are obtained by high-temperature self-propagating synthesis (SHS) of various metal powders. The class of such composites includes MAX phases. The aim of this work is to synthesize a MAX-phase of the (Fe,Ti)3(Si,Al)C2 type by self-propagating high-temperature synthesis of a mixture of Ti, FeSi, Al and carbon in equimolar ratios. The synthesized main phase exhibits magnetic properties due to its iron and silicon content. Experiments have shown that from a mixture of powders of ferrosili¬co¬n, titanium, aluminum, carbon by the SHS method, it is possible to obtain a powdery base mass containing 93% of the MAX-phase composition of the type (Fe,Ti)3(Al,Si)C2 by mass, and 7% embedded in rich crystals iron Fe5Si3, Fe3Si and FeSi, which impart magnetic properties to the material, also contain Ti5Si2 and TiC-2% by weight insoluble in the main phase. In order to accurately assess the size distribution of embedded products in the main phase, a new analysis method was chosen - modern automatic microradiographic analysis (MRSA). The principle of the analysis was presented. The microstructure of such a MAX material, synthesized by powder metallurgy (SHS synthesis) methods, has a layered, laminate nature and can become a good raw material for further alloying of this compound with various metals for the development of powder metallurgy in Armenia.