Oxidation kinetics and surface chemistry of an Fe-Cr-Al-Y alloy medium made of 12-mu m diameter fibers at elevated temperatures in dry air
Abbreviated Journal Title
Fe-Cr-Al-Y; oxidation kinetics; X-ray photoelectron spectroscopy; fiber; media; FIB; parabolic kinetics; alumina; surface chemistry; ALUMINA SCALES; GROWTH-MECHANISM; IN-738LC SUPERALLOY; ALPHA-ALUMINA; AL2O3 SCALES; OXIDE SCALES; O-18 TRACER; DIFFUSION; YTTRIUM; FILMS; Metallurgy & Metallurgical Engineering
Fiber media composed of Fe-Cr-Al-Y alloy are being used increasingly as materials for high-temperature applications for their excellent oxidation resistance. The oxidation kinetics of Fe-Cr-Al-Y alloy fiber medium as a heat-resistant material for high-temperature applications was studied in dry air at 1073, 1188, 1255, and 1318 K. The oxidation process followed the parabolic kinetic law. The alumina-scale growth was found to be influenced by short-circuit diffusion and the presence of stresses related to oxide-scale growth. The surface of the oxide scale formed on the fiber medium was analyzed using X-ray photoelectron spectroscopy, which revealed that the outer surface of the oxide scale formed on the fiber medium composed of 12-mum diameter Fe-Cr-Al-Y alloy fibers, consisted of theta-Al2O3, alpha-Al2O3, and Cr-oxide. The metastable theta-Al2O3 subsequently partially transformed into the more stable alpha-phase following a time-temperature-transformation relationship. The surface morphology and the cross section of the oxide scale formed on the fiber medium in the temperature range 1073-1318 K in dry air, have been studied by scanning-electron spectroscopy (SEM) and focused-ion beam, respectively.
Oxidation of Metals
"Oxidation kinetics and surface chemistry of an Fe-Cr-Al-Y alloy medium made of 12-mu m diameter fibers at elevated temperatures in dry air" (2003). Faculty Bibliography 2000s. 3871.