Behavior of iron aluminides in oxidizing and oxidizing/sulfidizing environments

摘要: Abstract Fe3Al alloys have potential as structural materials and coatings for use in hostile environments because they form protective scales at very low oxygen partial pressures elevated temperatures. Weight gains parabolic rate constants were small exposures to dry air 800 900°C. Chromium additions resulted higher initial rates of oxidation 900°C substantially increased overall reaction a aggressive oxidizing/sulfidizing mixed gas when greater than 2 at.%. There was some evidence that an α-alumina layer formed during extended exposure The ability rapidly oxide appeared limit damage caused by any loss scale thermal cycling. Preoxidation reduced the corrosion Fe3Al5%Cr gas, but aluminizing this alloy FeAl coating be best way assure long-term protection sulfidizing environments.