STUDY OF HEAT RESISTANCE AT AIR OF THE SINTERED TITANIUM ALUMINIDE
The article is devoted to studying of oxidation processes at air for titanium aluminide material sintered at temperatures of 1150-1300 oC, obtained by mechanical alloying of a powder composition Ti-14Al-20Nb (wt.%). Study of heat resistance are performed for the temperature range 600 – 800 oC. Defined parameters such as oxidation penetration depth of corrosion, the change in mass of the samples, constant speed oxidation. From obtained graphical dependences it follows that the process of high-temperature oxidation is conventionally implemented in two stages. The first stage proceeds in a linear law. At some point in time the oxidation processes in the future pass into a second stage, obeying a power law. It is shown that the best heat-resistant characteristics have samples of titanium aluminide sintered at temperatures of 1250 and 1300 oC for 4 h.