Loai Ben Naji and Osama M. Ibrahim and Khaled J. Al-Fadhalah
Formation of Protective AluminumOxide Layer on the Surface of FeCrAl SinteredMetalFibers via MultiStage Thermal Oxidation
596 - 599
2018
12
11
International Journal of Chemical and Materials Engineering
https://publications.waset.org/pdf/10009752
https://publications.waset.org/vol/143
World Academy of Science, Engineering and Technology
The objective of this paper is to investigate the formation and adhesion of a protective aluminumoxide (Al2O3, alumina) layer on the surface of IronChromiumAluminum Alloy (FeCrAl) sinteredmetalfibers. The oxidescale layer was developed via multistage thermal oxidation at 930 oC for 1 hour, followed by 1 hour at 960 oC, and finally at 990 oC for 2 hours. Scanning Electron Microscope (SEM) images show that the multistage thermal oxidation resulted in the formation of predominantly Al2O3 plateletslike and whiskers. SEM images also reveal nonuniform oxidescale growth on the surface of the fibers. Furthermore, peelingspalling of the alumina protective layer occurred after minimum handling, which indicates weak adhesion forces between the protective layer and the base metal alloy. Energy Dispersive Spectroscopy (EDS) analysis of the heattreated FeCrAl sinteredmetalfibers confirmed the high aluminum content on the surface of the protective layer, and the low aluminum content on the exposed base metal alloy surface. In conclusion, the failure of the oxidescale protective layer exposes the base metal alloy to further oxidation, and the fragile nonuniform oxidescale is not suitable as a support for catalysts.
Open Science Index 143, 2018