【摘要】 在钕铁硼基粉中加入不同量的纳米Cu粉,采用二元合金法制备烧结磁体。结果表明,在相同的制备条件下,采用二级回火工艺制得的样品主相取向度有很明显的提高,同时α-Fe的含量也得到了有效控制。纳米Cu粉质量分数为0.25%时,样品剩磁、矫顽力、最大磁能积分别提高了3.5%、9.9%、7.8%,扫描电镜下观察晶界十分清晰、晶粒尺寸趋于均匀化,这样的结构抑制了主相的交换耦合作用,样品的矫顽力也达到较优值1127k A/m。同时,样品在0.005mol/L的H2SO4溶液中腐蚀96h后质量损失仅为0.0217g/cm3,耐腐蚀性能得到较明显的改善,硬度达到了628HV。更多还原

【Abstract】 Nd2Fe14B magnet materials were fabricated by method of binary alloys with adding nanometer Cu powder. The results show that orientation of the major phase is obviously improved by two-stage tempering, and simultaneously α-Fe is effectively controlled. The remanence, coercive force, and maximum magnetic energy product increase by 3.5%, 9.9%, 7.8% respectively fore Cu addition of 0.25wt%, as a result of clear grain boundaries and homogenization of grain size, which results in suppressing exchange coupling of the main phases. At the same time the corrosion resistance of samples is improved obviously, with mass loss of only 0.0217 g/cm3 in 0.005mol/L H2SO4 after 96 hours and hardness of 628 HV.更多还原