Oxidation lifetimes of the FeCrAl-RE alloys at ultra high temperatures are
governed ultimately by chemical failure of the protective alumina scale, of
ten accelerated by prior mechanical failure resulting in scale cracking and
spallation. Critical parameters involved in these failure modes are expect
ed to be influenced by alloy thickness. Therefore, the effect of alloy thic
kness upon the lifetime oxidation behaviour, in air, at 1,300 degrees C has
been studied for three commercial FeCrAl-RE alloys, Kanthal AF, Kanthal AP
M and PM2000, that have been fabricated by the three principal fabrication
routes. As a result, these alloys have different creep properties, which al
so could have a significant influence on oxidation behaviour.