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AbstractAbstract
[en] Oxidation kinetics of (Co,Ni)CrAlY powders containing respectively 6, 8, and 10 wt.% of Al was studied between 850 and 1200 C. Powder grain size has no significant influence on oxidation kinetics of these powders. All the weigth gain curves can be interpreted according to a parabolic kinetics. Oxidized powders were examined and analyzed by XRD, SEM and EDS, cross-section metallography. At test temperatures lower than 1000 C, the main components of oxide scales are a complex spinel (Co,Ni)Cr2O4 and Cr2O3. Internal oxidation of Al occurs leading to the consumption of β-NiAl and the formation of a β-free layer of γ. At temperatures above 1000 C, the major component of oxide scales is α-Al2O3. Some Y-rich oxides are also detected by XRD or SEM and EDS analysis. (orig.)
Original Title
Oxydation a haute temperature de poudres d'alliages MCrAlY (M=Co, Ni) a differentes teneurs en aluminium
Primary Subject
Source
4. international symposium on high temperature corrosion and protection of materials; 4. Colloque International sur la Corrosion et la Protection des Materiaux a Haute Temperature; Les Embiez (France); 20-24 May 1996; 5 refs.
Record Type
Journal Article
Literature Type
Conference
Journal
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