621.793.7 We have studied the oxidation resistance of chromium intermetallics: TiCr 2 , HfCr 2 , and ZrCr 2 , in the temperature interval 873-1473 K with isothermal holding of the specimens for up to 20 h. We have shown that the intermetallics TiCr 2 and HfCr 2 are oxidized 2-3 times more slowly than pure titanium and hafnium, but more than 1-2 orders of magnitude faster than chromium at T ≤ 1273 K and 4-6 times faster at 1473 K. In this temperature interval, the intermetallic ZrCr 2 is rapidly oxidized at an increasing rate as the heating temperature rises. The scaling resistance of intermetallics of Group IV d metals with chromium is determined by formation of scales in which the major role is played by the oxides TiO 2 , HfO 2 , and ZrO 2 , with weak protective properties.
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