快淬速度对Nd_(10)Fe_(81)Co_3B_6薄带相结构及晶化过程的影响

Effects of melt-spinning speed on microstructure and crystallization procedure of Nd_(10)Fe_(81)Co_3B_6 ribbons

熔体快淬工艺中,快淬速度对Nd-Fe-B型薄带磁性材料的结构与性能影响显著。利用熔体快淬法制备了Nd10Fe81Co3B6薄带,研究了快淬速度对其相结构以及晶化过程的影响。结果表明,快淬速度不同,薄带的非晶程度不同,随着快淬速度的增加,薄带中非晶相含量增加。而不同淬速薄带的晶化过程也存在很大差异,当淬速较低时,薄带晶化程度较高,为质点控制晶化模式;当淬速较高时,薄带中基本为非晶化相,此时为持续晶化模式。以15～50m/s速度快淬的薄带开始晶化的温度在540～610℃范围内。

Melt-spinning speed has a significant effect on the microstructure and properties of meltspinning Nd-Fe-B ribbons.In this paper,Nd10Fe81Co3B6ribbons were prepared by melt-spinning method with different meltspinning speeds,and the effects of melt-spinning speeds on the phase structure and crystallization procedure of Nd10Fe81Co3B6ribbons were studied.The results show that there are great differences in the content of amorphous phases under different melt-spinning speeds.When the melt-spinning speed was increased,the content of amorphous phase was also increased.Moreover,the crystallization processes of ribbons melt-spun at different speeds are different.When the melt-spinning speed was low,there was a high degree of crystallization phase, whose crystallization annealing was controlled by disperse particle nucleus;With increasing the melt-spinning speed,there was high content of amorphous phase,whose crystallization annealing was gradually controlled by continuous crystallization model.With increasing melt-spinning speeds from 15to 50m/s,the beginning crystallization temperature of all ribbons was at the range of 540-610℃.