Effect of sulfur and zirconium Co-doping on the oxidation of NiCrAl

Conference · Thu Oct 01 04:00:00 EDT 1987

OSTI ID:5682830

Smialek, J L

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

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ADHESION
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
DATA
EXPERIMENTAL DATA
INFORMATION
NICKEL ALLOYS
NUMERICAL DATA
OXIDATION
SULFUR ADDITIONS
TEMPERATURE EFFECTS
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS