【摘要】 用超声化学法制备纳米Fe颗粒包覆的Nd₂Fe₁₄B复合粉体,将其在Ar气保护下经放电等离子烧结（SPS）,得到Nd₂Fe₁₄B/α-Fe纳米晶复合磁体．Fe名义质量分数为5%的烧结磁体具有较高的磁性能:B_r=0．86 T,H_ci=683．8 kA/m, （BH）_max=95．92 kJ/m³．烧结前对复合粉末进行适当的高能球磨,能促进显微组织进一步细化,增强软磁相与硬磁相之间的交换耦合,使相同Fe含量和烧结工艺的磁体B_r和（BH）_max分别提高到0．94 T和113．6 kJ/m³．更多还原

【Abstract】 Fe nanoparticles prepared by sonochemical treatment of carbonyl iron were applied to coat micrometer sized Nd₂Fe₁₄B permanent magnetic powder.The composite powders were then prepared into bulk nanocomposite Nd₂Fe₁₄B/α-Fe magnets.By using spark plasma sintering（SPS）technique,the magnets with the nominal Fe content（mass fraction）of 5% bares optimal magnetic properties of Br 0.86 T,H_ci683.8 kA/m and（BH）max 95.92 kJ/m³ were prepared.A high ball milling pretreatment to the composite powders is helpful for obtaining magnets with fine grains and even microstructure.As a result, the B_r and（BH）_maxof the magnet increase to 0.94 T and 113.6 kJ/m³,respectively.更多还原