High-temperature oxidation of Fe40Al coatings obtained by HVOF thermal spray

摘要: Abstract The objective of the present work is to provide insight into high-temperature performance iron aluminide intermetallic coatings, sprayed using high velocity oxygen fuel. Isothermal oxidation experiments were completed at 900, 1000 and 1100 °C cross sections free surfaces coatings characterized after 4, 36 72 h exposure. results show differences in behaviour those temperatures they are specially remarkable when compared bulk materials. For example, while where FeAl presents a compact alumina layer, failed reveal presence stable α-Al 2 O 3 phase, an accelerated corrosion was observed leading detachment from substrate. On basis these results, reasonable good exhibited 900 °C indicates this could be border line resistance for coatings.