The Effect of Doping Cu Powders on Mechanical Properties and Magnetic Properties of Sm(CoFeCuZr)z Sintered Magnets

The effect of doping Cu on the mechanical properties and magnetic properties of Sm(Co
_0.71
Fe
_0.15
Cu
_0.07
Zr
_0.03
)
_7.6
magnets was studied systematically. The results show that the Cu-lean grain boundaries and bending strength of the magnet can be improved by increasing of doping Cu content. The optimal magnetic properties of magnet with 1.0 wt% Cu doping are B
_r
= 9.9 kG, H
_cj
= 23.0 kOe, and (BH)
_max
= 22.2 MGOe. With the doping content of Cu powders, the bending strength first reaches a peak value of 143.0 MPa at 1.0 wt% and then drops. The bending strength of the magnet with 1.0 wt% Cu doping is about 51.8% higher than that of the magnet with 0 wt% Cu doping. The coercivity and bending strength of the magnet are improved.