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Alvarado-Orozco, J. M.; Morales-Estrella, R.; Boldrick, M. S.; Trapaga-Martinez, G.; Gleeson, B.; Munoz-Saldana, J.
Metallurgical and materials transactions. A, Physical metallurgy and materials science, 02/2015, Letnik: 46, Številka: 2Journal Article
An oxidation study of β -(Ni,Pt)Al commercial bond coat systems was carried by means of TGA analysis during isothermal treatments at temperatures from 1273 K to 1423 K (1000 °C to 1150 °C). The effect of oxygen partial pressure on their oxidation kinetics was studied and complemented by photo-stimulated luminescence spectroscopy and SEM. Pre-oxidation treatments performed on as-aluminized samples at 10 −5 atm O 2 did not accelerate the θ -Al 2 O 3 → α -Al 2 O 3 transformation, even after 5 hours of oxidation relative to samples oxidized in 0.21 atm O 2 , with the exception of the sample treated at 1273 K (1000 °C), where apparently α -Al 2 O 3 nucleation started earlier for the sample treated at a low p O 2 .
