Abstract
The kinetics and mechanism of high-temperature oxidation in air (up to 1200°C) have been established for intermetallides in the titanium ― aluminum system (γ-TiAl, TiAl3, and α2-Ti3Al) by differential thermal analysis, thermogravimetry, XRD, electron microscopy, and Auger spectroscopy. It is found that the increase in corrosion resistance in these intermetallides is due to the formation of β-tialite (Al2TiO5) in films by solid-phase reaction between TiO2 (rutile) and αAl2O3 at 1100-1200°C. There is a substantial increase in the resistance of TiAl3 to high-temperature oxidation (up to 1400°C) after of the preceding oxidation and stepped heat treatment at lower temperatures. It is desirable to use γ-TiAl and TiAl3 as constructional materials up to 1100°C.
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