25Nd75)25Dy6Al0.5B1Co1Cu0.2Febal.的燒結(jié)Nd-Fe-B磁體,并研究了不同磁粉粒徑制備的燒結(jié)Nd-Fe-B磁體磁性能和初始磁化階段最大磁導(dǎo)率的相應(yīng)演變規(guī)律。結(jié)果表明,磁粉平均尺寸為3.0 μm時(shí)對(duì)應(yīng)的磁體的內(nèi)稟矯頑力最好,磁粉平均尺寸為3.5 μm 時(shí)對(duì)應(yīng)的磁體的剩磁最高。從磁體的微觀結(jié)構(gòu)觀察和性能測(cè)試發(fā)現(xiàn),磁粉粒徑為3.0μm時(shí),燒結(jié)磁體主相更加規(guī)則、均勻,提高了磁體的矯頑力。隨著平均磁粉尺寸進(jìn)一步減小,磁粉粒徑2.5μm時(shí),富Nd相以氧化物形式發(fā)生了團(tuán)聚,且分布不均勻,磁體晶界出現(xiàn)孔洞,去磁耦合效率下降,導(dǎo)致磁體矯頑力降低；磁體氧含量隨著磁粉平均尺寸的減小而增大,磁體內(nèi)雜質(zhì)相增多,剩磁下降；增多的雜質(zhì)相使得磁化初始階段的最大磁導(dǎo)率降低。"/>

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磁粉粒徑對(duì)燒結(jié)Nd-Fe-B磁性能和初始磁導(dǎo)率的影響
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江西理工大學(xué) 江西 贛州341000

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TM273

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國(guó)家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃),(項(xiàng)目編號(hào)：2010AA03A401)


Effect of Particle Size on the Magnetic Properties and Initial Susceptibility of Sintered Nd–Fe–B Magnets
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Jiangxi University of Science and Technology,Ganzhou,China,341000

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    摘要:

    本文采用粉末冶金方法制備了名義成分為(Pr25Nd75)25Dy6Al0.5B1Co1Cu0.2Febal.的燒結(jié)Nd-Fe-B磁體,并研究了不同磁粉粒徑制備的燒結(jié)Nd-Fe-B磁體磁性能和初始磁化階段最大磁導(dǎo)率的相應(yīng)演變規(guī)律。結(jié)果表明,磁粉平均尺寸為3.0 μm時(shí)對(duì)應(yīng)的磁體的內(nèi)稟矯頑力最好,磁粉平均尺寸為3.5 μm 時(shí)對(duì)應(yīng)的磁體的剩磁最高。從磁體的微觀結(jié)構(gòu)觀察和性能測(cè)試發(fā)現(xiàn),磁粉粒徑為3.0μm時(shí),燒結(jié)磁體主相更加規(guī)則、均勻,提高了磁體的矯頑力。隨著平均磁粉尺寸進(jìn)一步減小,磁粉粒徑2.5μm時(shí),富Nd相以氧化物形式發(fā)生了團(tuán)聚,且分布不均勻,磁體晶界出現(xiàn)孔洞,去磁耦合效率下降,導(dǎo)致磁體矯頑力降低；磁體氧含量隨著磁粉平均尺寸的減小而增大,磁體內(nèi)雜質(zhì)相增多,剩磁下降；增多的雜質(zhì)相使得磁化初始階段的最大磁導(dǎo)率降低。

    Abstract:

    Particle refinement is the effective way to improve the coercive force without increasing the HRE content in Sintered Nd-Fe-B magnets. The magnetic properties and initial magnetization permeability has been investigated in order to correlate the particle refinement by traditional powder metallurgy method with nominal composition of (Pr25Nd75)25Dy6Al0.5B1Co1Cu0.2Febal sintered Nd-Fe-B magnet. The particles with average size of 3.0 μm achieved the best Hcj, and the particles with average size of 3.5 μm obtained the best Br respectively. Refined particle size which made the morphology regular and uniform. But with further decreased the average particle size, Nd rich phase was in the form of oxide, and unevened distribution in the grain boundary, and the demagnetization coupling efficiency droped, results in the decrease of Hcj. The oxidation content increased with the average size becoming samller, the Br decreased with the impurity content increased. On the other hand,the initial permeability dramatically fallen with the impurity content.

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劉路軍,劉政.磁粉粒徑對(duì)燒結(jié)Nd-Fe-B磁性能和初始磁導(dǎo)率的影響[J].稀有金屬材料與工程,2019,48(2):668~672.[Liu Lujun, Liu Zheng. Effect of Particle Size on the Magnetic Properties and Initial Susceptibility of Sintered Nd–Fe–B Magnets[J]. Rare Metal Materials and Engineering,2019,48(2):668~672.]
DOI：10.12442/j. issn.1002-185X.20170456

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  • 收稿日期:2017-05-31
  • 最后修改日期:2017-08-13
  • 錄用日期:2017-09-11
  • 在線發(fā)布日期: 2019-03-15
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