J. Japan Inst. Metals, Vol. 44, No. 12 (1980),
pp. 1384-1392

Oxidation Behaviour of Vanadium at High Temperatures at P_{O_2}=1.33×10³∼1.33×10⁴ Pa and the Comparison with Those Obtained at P_{O_2}=0.133∼133 Pa

Toshiaki Yoneoka¹, Michio Yamawaki² and Masayoshi Kanno¹

Abstract:

Oxidation of pure vanadium has been investigated at temperatures of 723∼903 K and oxygen pressures of 1.33×10³∼1.33×10⁴ Pa by means of a thermo-electrobalance, an X-ray diffractometer, a Knoop hardness tester as well as metallographic techniques. The oxidation proceeded according to a parabolic rate law. The obtained parabolic rate constans scarcely exhibited pressure dependence. The activation energy for parabolic oxidation process was about 180 kJ/mol. The oxide scale on most specimens was composed of three layers of V₂O₅, V₆O₁₃ and VO₂. These results were compared with those of the preceding study performed at lower oxygen pressures of 0.133∼133 Pa.

(Received 1980/06/16)

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