Formation Of Aluminum-oxide Layer On The Surface Of Fe-Cr-Al Fibers | 107006
Journal of Material Sciences & Engineering
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The objective of this paper is to investigate the formation and adhesion of a protective aluminum-oxide layer
(alumina) on the surface of Iron-Chromium-Aluminum (Fe-Cr-Al) alloy. The oxide scale layer was developed via
multi-stage thermal oxidation that consists of the following heating stages: at 930°C for one hour, at 960°C for 1 hour,
and finally at 990°C for 2 hours for a total of 4 hours, which represents one heat treatment cycle. Thermogravimetric
Analyses (TGA) was performed to quantify the development of the oxide layer. The first sample was tested for one
cycle of 4hours; while the second sample was tested for 18 repeated cycles of 4 hours for a total of 72 hours. Both
samples gained weight due to oxidation.Scanning electron microscope (SEM) images show that one heat treatment
cycle, results in the formation of predominantly alumina platelets like and whiskers. After 18 heat treatment cycles,
however, the surface of the oxide scale layer becomes smoother and more uniform. Following vibration for1 hour
consists of 50Hz for 30min, 100Hz for 15min, and finally at 150Hz for 15min and minimum handling of the two
samples, peeling or spalling of the protective oxide layer was observed. Energy Dispersive spectroscopy (EDS)
analysis of the heat-treated samples of Fe-Cr-Al sintered metal fibers confirmed the high aluminum content on the
surface of the protective oxide layer and the low aluminum content on the exposed base metal alloy surface.
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Osama M Ibrahim has completed his Graduation at the University of Wisconsin-Madison, USA with a PhD degree in Mechanical Engineering and minor in Chemical Engineering. He has held various teaching, research & development, and executive management positions at RYPOS, Inc., University of Rhode Island, and University of North Carolina-Charlotte. Currently, he is a visiting Associate Professor at University of Kuwait.