Abstract
The fabrication of soft magnetic Fe parts by the medium-frequency electrical resistance sintering (MF-ERS) technique is studied in this paper. This consolidation technique involves the simultaneous application to metallic powders of pressure and heat, the latter coming from the Joule effect of a low-voltage and high-intensity electric current. Commercially pure iron powder was used in the consolidation experiences. The porosity distribution, microhardness, electrical resistivity and hysteresis curves of the final compacts were determined and analysed. The results obtained were compared both with those of compacts consolidated by the conventional powder metallurgy (PM) route of cold pressing and vacuum furnace sintering, and with fully dense compacts obtained by double cycle of cold pressing and furnace sintering in hydrogen atmosphere.
Highlights
Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Sevilla, Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Huelva, Abstract: The fabrication of soft magnetic Fe parts by the medium-frequency electrical resistance sintering (MF-ERS) technique is studied in this paper
The two major applications of sintered soft magnetic components in electromagnetic systems are sensors, which convert a movement into an electrical signal, and actuators, with the opposite working principle
Medium-frequency projection welding equipment was adapted for the electrical consolidation process denominated MF-ERS
Summary
Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Sevilla, Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Huelva, Abstract: The fabrication of soft magnetic Fe parts by the medium-frequency electrical resistance sintering (MF-ERS) technique is studied in this paper. This consolidation technique involves the simultaneous application to metallic powders of pressure and heat, the latter coming from the Joule effect of a low-voltage and high-intensity electric current. PM processing includes methods such as mechanical alloying [3]: the possibility of obtaining in the starting powder compositions and homogeneities impossible to be attained by equilibrium methods
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