The elemental distribution in the oxide scale on a conventionally cast and a metallurgical ODS FeCrAl alloy characterized by ToF-SIMS

Artikel i vetenskaplig tidskrift, 2014

The commercial FeCrAl alloys Kanthal APMT(TM) (powder metallurgical) and Kanthal AF(TM) (conventionally cast) contain reactive elements (RE) to improve scale properties. These alloys were oxidized at 1100 degrees C for 168h to form a protective alumina scale. These scales were then investigated with Time of flight secondary ion mass spectrometry to examine the distribution of the REs. The results showed an accumulation of Y, Zr, Mg and Mo in the outermost part of the oxide scales on both alloys. Low levels of these elements were also detected in the oxide scales. In addition, Mo was accumulated together with Cr in the oxide of APMT.