Rev. Met. Paris
Volume 98, Number 2, February 2001Tribologie de la mise en forme des métaux
|Page(s)||193 - 199|
|Published online||25 October 2002|
Oxidation behaviour of a PM β-NiAl material in air at 1200°C < T < 1400°C
The oxidation behaviour of a β-NiAl material (produced by powder metallurgy) was investigated in the temperature range 1200°C < T < 1400°C. In isothermal runs at 1200 and 1400°C, an alumina scale grew according to a parabolic growth law. At 1300°C, catastrophic oxidation was observed, but a short anneal at low oxygen partial pressure at 1200°C, prior to the oxidation at 1300°C, initiated a parabolic scale growth. Further, cyclic oxidation tests were carried out and the growth mechanism of the scale was identified by two-stage oxidation (16O2/18O2) in combination with SNMS isotope profile analysis.
© La Revue de Métallurgie, 2001
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