Abstract
The resistance of TiAl coupons to cyclic oxidation at 1300 K in a flow of purified oxygen under atmospheric pressure has been significantly improved by preoxidation. The preoxidation was performed by heating the specimens, buried in rutile powder and encapsuled in a silica tube under a vacuum of 1.3×10−3 Pa, at 1200 K for 100ks. The scales formed by preoxidation are very adherent, and the mass changes are very small for at least up to 20 cycles (400 h) of subsequent oxidation. This excellent oxidation resistance is attributable to the formation of scales very rich in alumina by preoxidation under a very low oxygen partial pressure. A similarly good oxidation resistance was obtained when the specimens were buried in rutile powder and preoxidized in Ar gas under atmospheric pressure at 1300 K for 100 ks.
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Taniguchi, S., Shibata, A., Murakami, A. et al. Improvement in the oxidation resistance of TiAl by preoxidation in a TiO2-powder pack. Oxid Met 42, 17–29 (1994). https://doi.org/10.1007/BF01061922
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DOI: https://doi.org/10.1007/BF01061922