Effects of Cu and P on Crystallization and Magnetic Properties of FeSiB Alloy

The effects of Cu and P in the Fe<sub>84-x</sub>Si<sub>4</sub>B<sub>12-y</sub>P<sub>y</sub>Cu<sub>x</sub> (<i>x</i> = 0-0.9, <i>y</i> = 0-4) soft magnetic alloys on crystallization processes and magnetic properties were investigated. The apparent activation energy of Fe<sub>84</sub>Si<sub>4</sub>B<sub>8</sub>P<sub>4</sub> and Fe<sub>83.3</sub>Cu<sub>0.7</sub>Si<sub>4</sub>B<sub>8</sub>P<sub>4</sub> amorphous alloys are also calculated. The results show that Cu and P additions favor the first crystallization reaction and inhibit the second one of Fe<sub>84</sub>Si<sub>4</sub>B<sub>12</sub> effectively. The saturation magnetic flux density <i>B</i><sub>s</sub> increases and the coercivity <i>H</i><sub>c</sub> decreases with increasing Cu content in the range of 0-0.9%. The simultaneous additions of Cu and P result in a good combination of high saturation magnetic flux density and low coercivity.

[1]  A. Makino,et al.  New Excellent Soft Magnetic FeSiBPCu Nanocrystallized Alloys With High $B_{s}$ of 1.9 T From Nanohetero-Amorphous Phase , 2009, IEEE Transactions on Magnetics.

[2]  M. Ohta,et al.  Magnetic properties of nanocrystalline Fe-Cu-Si-B alloys , 2009 .

[3]  Akihiro Makino,et al.  FeSiBPCu Nanocrystalline Soft Magnetic Alloys with High Bs of 1.9 Tesla Produced by Crystallizing Hetero-Amorphous Phase , 2009 .

[4]  M. Ohta,et al.  Cu addition effect on soft magnetic properties in Fe–Si–B alloy system , 2008 .

[5]  M. Ohta,et al.  Magnetic properties of nanocrystalline Fe82.65Cu1.35SixB16- x alloys (x=0-7) , 2007 .

[6]  I. Stloukal,et al.  Diffusion and structural changes in Fe91−yMo8Cu1By alloys , 2007 .

[7]  R. Hasegawa.  Advances in amorphous and nanocrystalline magnetic materials , 2006 .

[8]  R. Ramanujan,et al.  The effect of Copper alloying additions on the crystallization of an amorphous Fe–Si–B alloy , 2006 .

[9]  J. Petzold.  Applications of nanocrystalline softmagnetic materials for modern electronic devices , 2003 .

[10]  A. Inoue,et al.  Structure and Magnetic Properties of Fe42.5Co42.5Nb7B8 Nanocrystalline Alloy , 2002 .

[11]  Michael E. McHenry,et al.  Amorphous and nanocrystalline materials for applications as soft magnets , 1999 .

[12]  G. Herzer,et al.  Grain size dependence of coercivity and permeability in nanocrystalline ferromagnets , 1990, International Conference on Magnetics.

[13]  Y. Yoshizawa,et al.  New Fe-based soft magnetic alloys composed of ultrafine grain structure , 1988 .