The goal of this short research stay was the optimization of the sintering parameters of two MIM iron-silicon alloys. The samples were prepared at the UC3M and the magnetic characterization was performed at the University of Porto. The results obtained led to soft magnetic parts with optimum properties.
The magnetic properties of the MIM Fe-Si alloys are strongly related to the sintering parameters. The atmosphere, temperature and sintering time play and important role on the final composition and the grain size of the alloys. The aim of the stay was the study of the influence of the sintering parameters on the magnetic properties of two Metal Injection Molded (MIM) iron-silicon alloys. For that, a batch of samples sintered under different conditions was made by the Powder Technology Group (GTP) of the UC3M. The samples were characterized at the University of Porto by a Superconducting Quantum Interference Device (SQUID) and a Vibrating Sample Magnetometer (VSM). The SQUID was employed to measure the hysteresis curves of the materials, at ± 5 Tesla. The VSM was employed to study the effect of the temperature on the magnetic response of the materials. This experiment was performed an applied field of ± 1 Tesla at 300, 500, 700 and 800 K. Through this study, the optimal sintering conditions of two MIM Fe-Si alloys have been determined.