快淬速度对Nd_(10)Fe_(81)Co_3B_6薄带微结构及磁性能的影响

Effects of Melt-Spinning Speed on Microstructure and Magnetic Properties of Nd_(10)Fe_(81)Co_3B_6 Ribbons

研究了快淬速度对熔体快淬法制备Nd10Fe81Co3B6薄带微结构及磁性能的影响。结果表明,随着快淬速度的增加,薄带中非晶相含量增加。快淬薄带在800℃晶化处理10min后,15m/s淬速的薄带基本由粒径大于50nm的Nd2(Fe,Co)14B与粒径小于25nm的Fe7Co3相组成,两相交换耦合作用较弱,而50m/s淬速的薄带中仍含有大量的非晶相,使得薄带的剩磁减小,但矫顽力没有明显降低;35m/s淬速的薄带退火后晶化完好,两相交换耦合作用最好,矫顽力达到249928A/m,剩磁达到84.3A.m2/kg。不同快淬速度薄带中主相Nd2(Fe,Co)14B的居里温度基本相同,约为630K。

Nd10Fe81Co3B ribbons were prepared by melt-spinning method at different melt-spinning speeds,and the effects of melt-spinning speeds on the microstructure and magnetic properties of Nd10Fe81Co3B ribbons were studied.The results show that the content of amorphous phase is increased with increasing the melt-spinning speed.After annealed at 800 °C for 10 min,the ribbons melt-spun at 15 m/s speeds are consisted of Nd2（Fe,Co）14B and Fe7Co3.The medium grain size of Nd2（Fe,Co）14B is greater than 50 nm,however that of Fe7Co3 size is smaller than 25 nm.Inter-grains exchange coupling interaction is weakened;there are high content of amorphous phase in the ribbons melt-spun at 50 m/s,which makes the remanence reduce,and the coercivity didn＇t obviously reduce.The ribbons melt-spun at 50 m/s had a optimum crystallization,and the inter-grains exchange coupling interaction acted well.Their magnetic properties are Hc=249 928 A/m,Mr=84.3 A·m2/kg.Furthermore,Curie temperature of the ribbons with different melt-spinning speeds are basically same,it＇s about 630 K.