Effects of the substitution of Si with P on the glass forming ability, crystallization behavior, and magnetic properties of FeCuNbSiBP atomized powder

Abstract

Soft magnetic nanocrystalline Fe80Cu1Nb2Si11−xB6Px (x = 0, 1, 2, 3, 4, 5, 6) alloy powders with nearly spherical shape were produced by gas-water combined atomization. Effects of the substitution of Si with P on the glass forming ability, crystallization behavior, magnetic properties of the powders, and the properties of magnetic powder cores made of these powders were studied. The P addition enhances the glass forming ability of the powders, facilitates the nucleation of α-Fe (Si) grains, and refines the grain size during annealing. Coercivity (Hc) and the saturation magnetic polarization (Js) of the powders decrease with the increase of P content. The Fe80Cu1Nb2Si6B6P5 powder annealed under 773 K exhibits better overall properties with grain size of 20.3 nm, Hc of 98 A/m, and Js of 1.42 T. The magnetic powder cores prepared from the Fe80Cu1Nb2Si6B6P5 powder have an effective permeability of 23.3 and a relative permeability of 90.5% under a DC magnetic field of 7.96 kA/m, and the core loss of 495 mW/cm3 at f = 100 kHz and Bm = 0.05 T.