Study of Structure and Properties of Cladded Coatings Based on Titanium Nickelide

This article discusses the conditions of formation of coatings based on titanium nickelide upon argon dual-arc cladding of titanium and nickel electrode wires on titanium samples. The quality of formation and the geometrical parameters of the joint upon dual-arc cladding have been evaluated. The interrelation between the ratio of the feeding rates of nickel and titanium wires and the chemical composition of cladded coatings has been established. The structures of cladded metal have been analyzed in the preset range of cladding modes. It has been demonstrated that, during argon dual-arc cladding at a preset ratio of feeding rates of titanium and nickel wires, the coatings are formed on the basis of the Ti2Ni and TiNi intermetallic phases. The mechanical and operational properties of the cladded coatings have been evaluated: hardness, resistance against abrasive wear, and heat resistance at 800°C. It has been shown that the relative wear resistance of cladded coatings is superior to that of titanium samples. The relative wear resistance of coatings has been described as a function chemical and phase composition. The heat resistance of cladded coatings as a function of the cladding modes and chemical composition of the metal joint has been determined.