纳米Cu粉添加对Nd_2Fe_(14)B烧结磁体性能的影响
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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。
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.
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.
引文
[1]宋小明,张英海,张伟南,等.改进片铸与烧结技术制备高性能磁体的研究[J].中国稀土学报,2013,31(2):169-174.
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[10]李志杰,包立夫,冯泉,等.用纳米原料制备SrM永磁铁氧体研究[J].磁性材料及器件,2011,42(3):30-33.
[11]李静,于秋婷,曹云东.金属蒸气电弧弧前形成过程及影响因素[J].沈阳工业大学学报,2013,35(5):492-497.
[12]Zeng X R,Sheng H C,Deng F,et al.Magnetic properties enhancement of Nd2Fe14B/α-Fe nanocomposites by Ta substitution[J].Physica B:Condensed Matter 2009,404(20):3739-3742.
[13]王景代,冯海波,李安华,等.双向合金法添加镝对烧结Nd-Fe-B磁性能及微观结构的影响[J].中国稀土学报,2013,31(1):19-123
[14]Raghavan V.Cu-Fe-Nd(Copper-lron-Neodymiurn)phase diagram evaluations:seetion[J].Journal of Phase Equilibria,1999,20(4):423-425.
[15]李建,王琳.Nd2Fe14B电泳法晶界扩散渗镝研究[J].中国稀土学报,2013,31(3):275-281.
[2]王占勇,温艳玲,谷南驹,等.烧结Nd Fe B的铸锭组织分析[J].磁性材料及器件,2002,33(1):7-10.
[3]Chen,B C,Liu X M,Chen R J,et al.The mechanism of enhanced magnetic properties of sintered permanent magnets by substitution of Pr for Nd[J].J Alloys Compds,2012,516:73-77.
[4]周军,宋伟,裴晓东.双合金法制备烧结钕铁硼磁体的研究[J].金属功能材料,2011,10(5):5-7.
[5]陈星华,李建,喻晓军.Nd2Fe14B磁体镀层结合力分析[J].金属功能材料,2013,20(3):24-27.
[6]刘伟,侯进.Nd2Fe14B电镀技术生产现状与展望[J].电镀与精饰,2012,4:21-25.
[7]Kim A S,Camp F E.High performance Nd2Fe14B magnets[J].J Appl Phys,1996,79(08):5035-5041.
[8]Liu W Q,Sun C,Yue M.Improvement of coercivity and corrosion resistance of Nd-Fe-B sintered magnets by doping aluminium nano-particles[J].Journal of Rare Earths,2013,31(1):65-68.
[9]李志杰,吕犇,于忠淇,等.纳米添加剂对锶铁氧体磁性能的影响[J].磁性材料及器件,2013,44(5):70-72.
[10]李志杰,包立夫,冯泉,等.用纳米原料制备SrM永磁铁氧体研究[J].磁性材料及器件,2011,42(3):30-33.
[11]李静,于秋婷,曹云东.金属蒸气电弧弧前形成过程及影响因素[J].沈阳工业大学学报,2013,35(5):492-497.
[12]Zeng X R,Sheng H C,Deng F,et al.Magnetic properties enhancement of Nd2Fe14B/α-Fe nanocomposites by Ta substitution[J].Physica B:Condensed Matter 2009,404(20):3739-3742.
[13]王景代,冯海波,李安华,等.双向合金法添加镝对烧结Nd-Fe-B磁性能及微观结构的影响[J].中国稀土学报,2013,31(1):19-123
[14]Raghavan V.Cu-Fe-Nd(Copper-lron-Neodymiurn)phase diagram evaluations:seetion[J].Journal of Phase Equilibria,1999,20(4):423-425.
[15]李建,王琳.Nd2Fe14B电泳法晶界扩散渗镝研究[J].中国稀土学报,2013,31(3):275-281.