Study on structure and magnetic properties of Y2(Fe, Co)14B melt-spun ribbons

Y2Fe14-xCoxB (X=8.5,9,9.5,10,10.5) melt-spun ribbons were prepared by modifying alloy composition and optimizing melt-spinning technique. It is found that Y2Fe14-xCoxB ribbons with a saturation magnetization of ∼120 emu/g and a coercivity less than 1 Oe can be prepared at x = 9.5 and a wheel rate of 55 m/s. TEM investigations exhibit that the ribbons are composed of Y2(Fe,Co)14B nanocrystals with a mean grain size of ∼5 nm and an amorphous matrix. The ribbons were subsequently pulverized by high energy ball milling technology, and the flakey particles with a length of ∼30 um and a thickness of ∼250 nm were obtained. Finally, the high-frequency electromagnetic properties of the composite magnetic ring formed by mixing flakey particles and paraffin wax in the mass ratio of 2:1 were measured, and the reflection loss (RL) value of the composite is less than -20 dB near 1-2 GHz, which indicates that the material is beneficial to the absorption of electromagnetic wave in 1-2 GHz band.