为了满足钕铁硼磁体在高温下运作的需求,减少磁体产生的涡流损耗,本文以夹层的方式制备了高电阻率的SmF3/NdF3复合钕铁硼磁体,探究了SmF3/NdF3复合粉添加量和比例对于钕铁硼磁体的电阻率、磁性能及力学性能的影响。研究表明,当SmF3/NdF3比例为3:1时,随着添加量的增加,磁体夹层的厚度提高,电阻率增大,磁能积和抗弯强度呈现下降趋势。当单位面积添加量达到6.52 × 10−4 g/mm2时,磁体电阻率增大到6.12 mΩ·cm,较未夹层的钕铁硼磁体电阻率146 μΩ·cm提高了一个数量级,但是磁体的最大磁能积和抗弯强度分别下降到39.61 MGOe/164 MPa;当保持夹层添加量不变,随着复合夹层中SmF3占比减小,夹层粉体逸散现象减弱,磁体的电阻率增大,当复合夹层SmF3/NdF3比例为1:5时电阻率最高,为24.3 mΩ·cm;当复合夹层SmF3/NdF3比例为1:1时,磁体的磁能积最高为43.91 MGOe,复合SmF3/NdF3的比例对磁体的抗弯强度影响并不相同,当复合夹层SmF3/NdF3比例为3:1时抗弯强度提高到了270 MPa,较无夹层钕铁硼磁体抗弯强度254 MPa提高了6%。To meet the operational requirements of NdFeB magnets under high-temperature conditions and mitigate eddy current losses, this study fabricates high-resistivity SmF3/NdF3 composite NdFeB magnets via a laminated structure. The effects of SmF3/NdF3 composite powder contents and stoichiometric ratios on resistivity, magnetic properties, and mechanical performance were systematically investigated. Results demonstrate that at a SmF3/NdF3 ratio of 3:1, increasing additive contents enhances interlayer thickness and resistivity of the magnets, reaching 6.12 mΩ·cm when the additive content achieves 6.52 × 10−4 g/mm2. While the magnetic energy product (BH)max was reduced to 39.61 MGOe and flexural strength to 164 MPa. Notably, the achieved resistivity of 6.12 mΩ·cm represents a one-order-of-magnitude improvement compared to non-laminated NdFeB magnets, which exhibit a resistivity
