烧结温度对Nd24.38Ce0.52Gd6.65Febal.TM1.76B0.95磁体组织与性能的影响

采用双合金法制备Nd24.38Ce0.52Gd6.65Febal.TM1.76B0.95（质量分数，%）永磁体，通过扫描电镜及能谱、AMT-4磁测试仪、电子万能力学试验机等手段研究烧结温度对磁体组织和性能的影响.结果表明：随烧结温度从1060℃升高到1100℃，在烧结温度为1080℃时，晶粒均匀且结合致密，富稀土相分布均匀，能获得较好的组织形态；富稀土相中稀土总含量从84.98%增加到98.04%，烧结过程中铈从主相显著扩散到富稀土相；磁体剩磁Br、矫顽力Hcj、磁能积（BH）max 先升后降，在1080℃烧结时获得较好的磁性能，分别为1.22 T、964 kA/m 和293 kJ/m3，同时磁体抗弯强度也达到最大值为257 MPa.

Effect of sintering temperature on microstructure and properties of Nd24.38Ce0.52Gd6.65Febal.TM1.76B0.95 magnet

Nd24.38Ce0.52Gd6.65FebalanceTM2.18 B0.95 (mass fraction,%) permanent magnets were prepared using du-al-alloy technology. The effect of sintering temperature on the microstructure and properties of the magnets was probed by scanning electron microscopy, energy dispersive spectrometer, AMT-4 magnetic tester and electronic universal mechanical testing machine. The sintering temperature applied in the article ranged from 1 060 °C to 1 100 °C . The results show that when the sintering temperature is 1 080 ℃, the best microstruc-ture of the magnets is obtained with uniform and tight grains and even-distributed Re-rich phase; with the sintering temperature rising from 1 060 °C to 1 100 °C, the content of Re in Re-rich phase rapidly increases from 84.98 % up to 98.04 % and the diffusion of Ce from the main phase to the Re-rich phase is greatly imp roved during the sintering process; magnetic remanence (Br), coercivity (Hcj), and maximum energy product (BH)max] of the magnets raise first and then decrease as the increase of sintering temperature;when sintered at 1 080 ℃, the magnets exhibits the best properties, with Br of 1.22 T, Hcj of 964 kA/m and (BH)max of 293 kJ/m3, along with the maximum bending strength of 257 MPa.