Effect of reactive element oxide coating on the high temperature oxidation behaviour of FeCrAl alloys

摘要: Abstract The influence of yttrium oxide coating (processed by the sol–gel method) on oxidation behaviour a commercial FeCrAl alloy (Kanthal A1) has been investigated during isothermal exposures in air at 1373 K. scale growth kinetics uncoated obey parabolic rate law whole test, whereas kinetic curves Y-coated specimen exhibit an initial transient stage for first few hours, followed regime. deposited bare does not provide beneficial effect usually ascribed to reactive elements. No improvement coated is observed, constant values are strictly identical both specimens. In situ X-ray diffraction reveals marked element composition scale. layer formed yttrium-coated comprised, addition α-alumina which main also identified specimen, presence aluminates (YAlO3, Y3Al5O12) located outermost part layer.