显微组织对NdFeB磁体β（_iH_c）的影响

EFFECT OF MICROOSTRUCTRUCTURE ON THE β(iHc)OF NdFeB MAGNETS

研究了显微组织对ＮｄＦｅＢ磁体ｉＨｃ及β（ｉＨｃ）的影响，对ＮｄｘＦｅ９３－ｘＢ７磁体，ｘ从１６增加到２８时，Ｈｃ增加了５５％，β（ｉＨｃ）降低了约１１％；进一步优化显微组织，增加富Ｎｄ晶间相，减弱晶粒间的磁耦合作用及消除晶粒表面的高退磁场区域，不仅可提高磁体的矫顽力，亦可显著改善其矫顽力温度系数。

It is found that iHc increases nearly 55%,correspondingly the β(iHc)improves about11%when x changes from 16 to 28 for NdzFe93-xB7 magnets, The resuIt shows that optimizing the microstructure of NdFeB magnets by the intergranular Nd-rich phase surrounding theNd2Fe14B grains completely is important to control not only the iHc but also β(iHc)for Nd-FeB magnets.