Authors:
Angel Sota-Munoz (CEIT-BRTA, Spain),
Nerea Burgos (CEIT-BRTA, Spain),
Mihail Ipatov (UPV|EHU, Spain),
Jose Manuel Martin (CEIT-BRTA, Spain),
Julian Gonzalez (UPV|EHU, Spain)
Abstract:
Iron silicon gas atomized powder was coated with iron phosphate, epoxy resin and a mix of both to make soft magnetic composites (SMC). Iron phosphate composites were consolidated by cold pressing at 800 MPa or hot pressing at 825 ºC and 50 MPa. Composites made from epoxy resin or a mix of epoxy|phosphate were consolidated by cold pressing at 800 MPa. The microstructural characterization of the new cores was carried out by high resolution scanning electron microscopy. Differential scanning calorimetry showed that a degradation of the phosphate coating occurs at temperatures above ~880 ºC due to a reaction with silicon, limiting the maximum temperature for hot pressing. The best combination of properties was obtained for the hot-pressed iron phosphate composite, reaching high density (6.59 g|cm3), high electrical resistivity (~105 µO·cm), high saturation magnetization (1.75 T) and a low coercive field (~315 A|m).
DOI:
https://doi.org/10.59499/WP225371898