The Synthesis of Titanium Binary Compounds Ti₃AlC₂ and Ti₄AlN₃ in Isothermal Sintering

Abstract

The synthesis of Ti₃AlC₂ and Ti₄AlN₃, by isothermal sintering in vacuum is studied. The influence of the starting powders, charge composition, condition of milling and sintering temperature on the phase composition of the material is analyzed. Practically single-phase Ti₃AlC₂ with high density is synthesized in the range 1350–1400 °С when the aluminum content of the charge is higher than its stoichiometric amount by a factor of 1.4–1.6, for the Ti₄AlN₃ this factor is 1.2. It is shown that single-phase Ti₃AlC₂ or Ti₄AlN₃ or material with the required TiC (TiN) content can be synthesized by variation of aluminum content of the charge. The mechanical properties of the obtained materials in temperature ranges 20–1300 °С were investigated.