Synthesis of FeSiBPNbCu nanocrystalline soft-magnetic alloys with high saturation magnetization

Development of FeSiBNbCu Nanocrystalline Soft Magnetic Alloys with High B s and Good Manufacturability

“…Hence, the presence of Nb acts as an obstacle against the diffusion of Fe and suppresses the fast growth of the nanocrystals, resulting in a small a-Fe grain size during the annealing process. 8 This effect of the Nb content has been confirmed in previous research. [27][28][29][30][31][32] Moreover, the increasing of the Nb content can obviously broaden the temperature interval between the two crystallizations and drastically increase the crystallization activation energy of E Tx1 and E Tx2 , resulting in easily controlling growth rates of a-Fe and the achievement of excellent soft magnetic properties and good thermal stability, which will enhance the manufacturability of the alloys.…”

“…According to our previous study, these three peaks are arranged from low to high temperatures and correspond to the precipitation of multiple phases in the amorphous alloy ribbon. 8,22 Generally, the activation energy (E a ) of crystallization can be estimated by using the Kissinger equation 23 :…”

“…1 Nevertheless, the high content addition of noble metal elements like Zr and Co sharply increases the cost, which restricts the wide production and application of Hitperm and Nanoperm alloys. 8 For the newly developed Nanomet alloys, with a representative composition of Fe 85 Si 2 B 8 P 4 Cu 1 , 9 which exhibit attractive advantages of high B s of >1.8 T and low cost, the poor manufacturability attributed to the low amorphous forming ability is still a big obstacle for mass production. 8 FeSiBNbCu alloys with the trademark of Finemet, characterized by super-high effective permeability (l e ) and good manufacturability are widely used in many kinds of electronic devices.…”

“…8 For the newly developed Nanomet alloys, with a representative composition of Fe 85 Si 2 B 8 P 4 Cu 1 , 9 which exhibit attractive advantages of high B s of >1.8 T and low cost, the poor manufacturability attributed to the low amorphous forming ability is still a big obstacle for mass production. 8 FeSiBNbCu alloys with the trademark of Finemet, characterized by super-high effective permeability (l e ) and good manufacturability are widely used in many kinds of electronic devices. 2,10 However, the B s of the representative Fe 73.5 Si 13.5 B 9 Nb 3 Cu 1 alloy is only about 1.24 T because of the low Fe content and high Nb content.…”

Glass forming ability and magnetic properties of Fe–B–Si–EM (EM = Ti, Zr, Mo, and Hf) alloys with high iron content

“…Therefore, developing Fe-based amorphous alloys with high M s that meet the massive industrial production, one of the key points is to improve the GFA of Fe-based amorphous alloys with Fe content higher than 80 at.% [8]. Cu is a metal element that indissoluble in α-Fe, the small addition can form Cu-rich clusters in Fe-Si-B alloys, which can act as potent nucleation sites for α-Fe(Si) nanocrystals [9][10][11]. Furthermore, Nb can hinder the diffusion of Fe and Si thus reducing the growth of the nanocrystal [12].…”