Composition and properties of the diffusion layer formed upon heat treatment of an aluminum gas-thermal coating on titanium

An aluminum gas-thermal coating 200-300 μm thick is deposited onto the surface of titanium samples with an arc discharge. After heat treatment of the samples at 900 or 1000°C for 2, 4, or 6 h, the chemical composition and properties of the diffusion layer formed as a result of titanium and aluminum interdiffusion are studied. The main phase of the diffusion layer is found to be TiAl^sub 3^. The fractions of the phases TiAl^sub 2^, TiAl, and Ti^sub 3^Al are insignificant. The adhesion of the diffusion layer to the titanium substrate, the wear resistance, the friction coefficient, the hardness, the corrosion resistance, and the thermal and electrical conductivities are studied as functions of the heat-treatment temperature and time.[PUBLICATION ABSTRACT]