Dy元素对快淬(Nd, Pr)FeB合金的磁性能和晶化转变温度的影响

Effect of Dy Substitution on Magnetic Properties and Glass Transition Temperature of Nanocomposite Melt-spun (Nd,Pr)FeB Alloys

摘要:

采用快淬法制备了镨基(Nd,Pr)10.5-xDyxFe83.5B6 (x=0，1，2)系列粘结磁体，测定了快淬条带晶化转变温度，研究了添加Dy元素对快淬合金条带晶化转变温度的影响。合金中添加Dy元素，快淬态条带晶化过程中非晶态向晶态转变的开始温度及结束温度提高，转变的温度区间增大。由于热稳定性的提高，条带晶化退火需要采用较高的温度。添加2%Dy元素的(Nd,Pr)8.5Dy2Fe83.5B6合金，最佳退火温度比 (Nd,Pr)9.5Dy1Fe83.5B6和(Nd,Pr)10.5Fe83.5B6分别提高了15和30 ℃。添加Dy元素的粘结磁体，内禀矫顽力Hcj增加，但剩磁Br下降，实验制备的(Nd,Pr)9.5Dy1Fe83.5B6合金磁体的磁性能为Br=0.638 T，Hcj=611 kA/m，(BH)m=71.6 kJ/m3

Abstract:

The bonded magnets of (Nd,Pr)10.5-xDyxFe83.5B6 (x=0，1，2) alloys were prepared by melt-spun method. The glass transition temperatures of as-spun ribbons were measured by DSC. The effects of Dy addition on the transition temperature were investigated. It is shown from DSC curves that the glass transition onset temperature, peak temperature and end temperature increase with the Dy addition. The transition temperature range between the onset point and the end point enlarges. The ribbons are crystallized under higher annealing temperature due to their higher thermal stability. The optimum annealing temperature for (Nd,Pr)8.5Dy2Fe83.5B6 alloy with 2at% Dy is 15 °C and 30 °C higher than those for (Nd,Pr)9.5Dy1Fe83.5B6 and (Nd,Pr)10.5Fe83.5B6, respectively. With the Dy addition, the intrinsic coercivity Hcj enhances, but the remanence Br reduces. The magnetic property is: Br=0.638 T, Hcj=611 kA/m, and (BH)m=71.6 kJ/m3