Effect of sulfur and zirconium Co-doping on the oxidation of NiCrAl
Conference
·
OSTI ID:5682830
The adhesion behavior of Al/sub 2/O/sub 3/ scales formed on NiCrAl+Zr alloys was examined as a function of both sulfur and zirconium doping levels. In general, very high levels of zirconium were required to counteract the detrimental effects of sulfur. A sulfur-zirconium adherence map was constructed, as determined from the oxidation and spalling behavior in 1100 C cyclic tests. For low sulfur alloys, the amount of zirconium required for adherence at any given sulfur level can be described by Zr greater than 600 S sup 0.2 (in ppma). These results underscore the importance of sulfur to adhesion mechanisms and suggests that sulfur gettering is a first order effect of reactive element additions to MCrAl alloys.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 5682830
- Report Number(s):
- N-88-10940; NASA-TM-100209; E-3814; NAS-1.15:100209; CONF-871027-
- Country of Publication:
- United States
- Language:
- English
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