Reaction rates of pure titanium and zirconium with O
2, air, N
2 and CO
2 at high temperature were measured by a vacuum microbalance, and the products were also examined with x-ray analysis. These reactions follow mainly parabolic rate law, and the energies of activation of these reactions are, respectively, as follows
Zr-O
2 34200, Zr-air 42200, Zr-N
2 35000, Zr-CO
2 65000, Ti-O
2 39600 Ti-N
2 35000, Ti-CO
2 69000, (cal/mol)
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