Co_(80+x)Zr_(20-x)合金的永磁性能

Hard Magnetic Properties of Co_(80+x)Zr_(20-x) Alloys

利用X射线衍射和磁性测量研究Co80+xZr20-x(x=0,1,2,3,4)合金、快淬薄带的结构与磁性.结果表明,所有样品的比饱和磁化强度均较大,且在实验范围内随退火温度的升高而增加;经750℃热处理2 h后,Co81Zr19样品的比饱和磁化强度达到最大值128(A.m2)/kg;Co82Zr18快淬样品在25 m/s速率下的矫顽力最大,为60 kA/m,根据该样品中Co5Zr相的含量较大可知,Co5Zr相为Co-Zr合金的硬磁相;由初始磁化曲线可知,所有样品的矫顽力机制为成核模型.

The structure and magnetic properties of Co80＋xZr20-x （x = 0,1,2,3,4） alloys and the melt-ribbons were investigated by X-ray diffraction analysis and magnetic measurements. It was found that all the samples exhibited high-saturation magnetization. With increasing annealing temperature, the saturation magnetization values of all the samples increased largely in the experiment. The maximum value of saturation magnetization of melt-spun Co81Zr19 ribbons was 128（A·m^2）/kg, is obtained having been annealed at 750℃ for 2 h. For the melt-spun Co82Zr18 ribbons prepared at a velocity of 25 m/s, the maximum coercivity of 60 kA/m has been achieved. Owing to the high content of Co5Zr phase in the ribbons, it can be approximately deduced that the hard magnetic properties are attributed to the existence of Co5Zr phase in the Co-Zr alloys. The coercivity mechanism of the samples is mainly determined by the nucleation of reversed domain.