Effect of Cu and Zr Substitution on Magnetic Properties of Sm2Co7 Melt-Spun Ribbons
Sm2Co7-xRx(R=Cu,Zr;x=0,0.1,0.2,0.3,0.4)melt-spun ribbons were prepared by induction melting and melt spinning.The effects of substitution elements,substitution amount,and melt spinning rate on magnetic properties,intergranular interaction and irreversible reversal field of the melt-spun rib-bons were studied.The results of the magnetic property test show that Cu and Zr substitution causes strong pinning effect within the melt-spun ribbons,contributing to improving the coercivity of the melt-spun ribbons,and both achieve maximum coercivity at x=0.3.When the substitution amount x of Cu is 0.1,0.2 and 0.4,the remanence and maximum magnetic energy product of the melt-spun ribbons gradually decrease with the melt spinning rate,while they gradually increase at x=0.3.When the Zr substitution a-mount x is 0.1～0.4,the remanence and maximum magnetic energy product of the melt-spun ribbons in-crease at first and then decrease with the increase of melt spinning rate.The Henkel curve test results indi-cate that for both Cu and Zr substitution,8M value reaches its maximum at x=0.3,indicating that the in-tergranular exchange coupling effect in the melt-spun ribbons reaches its maximum at this point.The ma-ximum 8M values of Sm2(Co,Cu)7 and Sm2(Co,Zr)7 melt-spun ribbons are 1.48 and 1.04,respectively.A moderate substitution amount of Cu and Zr elements can enhance the irreversible reversal field Hn of the Sm2Co7 magnet during demagnetization.
Sm2Co7melt-spun ribbonCu and Zr substitutionmelt spinning ratemagnetic propertyex-change couplingirreversible reversal field
NETL
NSTL
万方数据
