Preparation of Porous FeNi Alloy Powder by Oxalate Thermal Decomposition and the Kinetics
YAO Yong-lin ZHANG Chuan-fu FAN You-qi ZHAN Jing
School of Metallurgical Engineering, Anhui University of Technology School of Metallurgy and Environment, Central South University School of Metallurgical Engineering, Anhui University of Technology School of Metallurgy and Environment, Central South University
Abstract：The porous FeNi alloy powder with a particle size of 1 mm and BCC structure was prepared by a thermal decomposition-reduction process of oxalate precursor, and the thermal decomposition process studied. The results showed that the precursor underwent two steps in the heating process, dehydration (217.5℃) and gas (CO and CO2) release (352.5℃), and the latter was the reason for the formation of porous structure. The thermal decomposition followed random nuclei production and nuclei growth model, the activation energy was 148.59 kJ/mol, the pre-exponential factor 1.25×107 and the kinetics function G(a)=[-ln(1-a)]0.44.
2015, Vol. 15 
