烧结钕铁硼磁体的热处理研究

STUDIES ON HEAT TREATMENT OF Nd-Fe-B SINTERED MAGNETS

系统研究了富Ｎｄ的ＮｄｘＦｅ９３－ｘＢ７（ｘ＝１６～２８）烧结磁体的热处理。磁体经低于６５０℃的热处理后，矫顽力显著提高，同时主相晶间出现ＮｄＦｅ２Ｏｘ相，热处理后矫顽力的增加由反向畴形核场的提高和ＮｄＦｅ２Ｏｘ相对反向畴壁钉扎场的增大共同贡献。

The effect of heat treatment on Nd richer NdxFe93-xB7(x=16～28)sintered magnets hasbeen systematically studied.The coercivity could be greatbenhanced byheat treatment be-low 650℃, Microstructure studies reveal that a NdFe2Ox phase appears in the intergranularregions of the matrix after the heat treatment.The enhancement of coercivity upon heattreatment is found to result both from the increase in the nucleation field for the reversed do-mains,and from the increase in the pinning field on the reversed domain walls due to the ap-pearance of the NdFe2Ox phase。