Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1606315 | Journal of Alloys and Compounds | 2016 | 6 Pages |
Abstract
The oxidation behavior of Fe-77Ni alloy scrap was investigated at an oxygen partial pressure of 0.2 atm and temperatures ranging from 400 °C to 900 °C. The corresponding oxidation rate increased with increasing temperature and obeyed the parabolic rate law, as evidenced by its linear proportionality to the temperature. In addition, surface morphologies, cross-sectional views, compositions, structural properties were examined by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Diffusion through either the spinel structure or the NiO layer, which were both present in the alloy during oxidation at elevated temperatures, was deemed the rate-limiting step of the reaction. The oxide powder less than 10 μm was obtained from Fe-77Ni alloy scrap was obtained using ball-milling and sieving processes. In fact, 15 h of milling yielded a recovery ratio of 97%. Using hydrogen gas, the oxide powder was successfully reduced to an alloy powder of Ni3Fe and reduction rates of â¼97% were achieved after 3 h at 1000 °C.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Inseok Seo, Shun-Myung Shin, Sang-An Ha, Jei-Pil Wang,