Research of Processes of Products Fabrication by Self-Propagating High-Temperature Synthesis (SHS) Method

摘要

In this paper, the processes of forming the samples of powder materials based on the titanium - nickel and nickel - aluminium systems were investigated. The possibility of conducting self-propagating high-temperature synthesis (SHS) in the nickel - aluminium system without protective atmosphere is shown. The initial heating temperature of the starting mixture is the main factor determining the flow of this process. Its growth leads to an increase of the synthesis speed. The number of the oxides decreases at the same time. Thermodynamic calculations of the combustion reactions were performed under different conditions. Phase analysis has shown the presence of the intermetallic compounds, which correspond to the phase diagram of the nickel - aluminium system. Thermodynamic calculations confirmed the assumption of preferential oxidation of metallic sodium when it was added to the mixture of powders in the titanium - nickel system. Technological features of obtaining products of various functional purposes are justified. The performed research confirms the effectiveness and promising use of self-propagating high-temperature synthesis for the products fabrication by powder metallurgy methods.