CO_2雰囲気におけるTi-15V-3Cr-3Sn-3Al合金の高温酸化

概要

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The oxidation of a Ti-15V-3Cr-3Sn-3Al alloy has been investigated in the temperature range of 1000K to 1400K in CO_2 atmosphere. The results of optical microscopy, electron probe microanalyses and powder X-ray diffraction measurements on the oxide scales formed during oxidation indicate that the scales consist of an external and an internal scale. The oxide phases and the carbide phase formed at 1100∿1300K are identified as tetragonal-TiO_2, orthorhombic-TiO_2, α-Al_2O_3, V_2O_5 and TiC. The oxides formed at 1400K are identified as SnO_2 together with the oxides and the carbide described above. The parabolic rate laws were confirmed on the growth of the internal scale layer and the permeation depth of oxygen in the alloy with the apparent activation energies, 210 kJ/mol and 166 kJ/mol, respectively.
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