Preparation of oxide powder by continuous oxidation process from recycled Fe-77Ni alloy scrap

4th Global Conference on Materials Science and Engineering

Yun, J.Y.^1 ; Park, D.H.^1 ; Jung, G.J.^2 ; Wang, J.P.^3

Powder Technology Research Group, Korea Institute of Materials Science (KIMS), Changwon

642-831, Korea, Republic of^1

Department of Architectural Engineering, Pukyong National University, Buean

608-737, Korea, Republic of^2

Department of Metallurgical Engineering, Pukyong National University, Busan

608-739, Korea, Republic of^3

关键词: Cross sectional area;    Elevated temperature;    Linearly proportional;    Oxidation behaviors;    Oxidation process;    Oxygen partial pressure;    Parabolic rate law;    Rate-limiting steps;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/103/1/012026/pdf
DOI  :  10.1088/1757-899X/103/1/012026

来源: IOP

【 摘 要 】

The oxidation behavior of Fe-77Ni alloy scrap was studied under a 0.2 atm oxygen partial pressure at the temperature range of 400°C to 900°C. The oxidation rate was found to be increased with an increase of temperature and followed the parabolic rate law with linearly proportional to temperature. Microstructure and cross-sectional area of the oxide layer were examined by SEM, EDX, and XRD. It could be speculated that rate-limiting step was controlled by diffusion through either the spinel structure or the NiO layer, both of which were present in this alloy during oxidation at elevated temperatures. In the long run, oxide powder less than 10 μm from Fe-77Ni alloy scrap was obtained using ball-milling and sieving processes and recovery ratio approached up to 97% for 15 hours.