Influence of Rhenium on the Heat Resistance of the Alloy of Cobalt with Niobium Carbide

Abstract

By the methods of physicochemical analysis, we study the influence of 1–9 wt.% of rhenium on the melting temperature, structure, and heat resistance of the industrial KhTN-62 cast alloy used for wear protection of the contact surfaces of working blades of gas-turbine engines. It was established that, for the optimal rhenium content varying from 3 to 9 wt.%, the oxidation resistance of the alloy at 1100°C becomes twice higher. In this case, the melting temperature of the alloy remains not lower than 1300°C, its structure does not change, and therefore, it is quite promising for application under severe operating conditions of gas-turbine engines.