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放電等離子燒結(jié)NdFeB的晶界結(jié)構(gòu)與矯頑力
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國(guó)家自然科學(xué)基金資助（50744014）；凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金資助；寧波市科技攻關(guān)項(xiàng)目資助（2006B100054）；浙江省科技攻關(guān)項(xiàng)目資助（2008C21046）；寧波大學(xué)王寬誠(chéng)幸?；鹳Y助


Grain Boundary Microstructure and Coercivity of NdFeB Magnet Prepared by Spark Plasma Sintering (SPS)
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    摘要:

    選取Nd11Dy2Gd2FebalAl4.0Nb0.8Zr0.8B6/Dy2O3磁粉采用放電等離子燒結(jié)技術(shù)制備各向異性磁體。微觀組織和磁性能研究表明，燒結(jié)溫度對(duì)磁體中晶界相的分布形態(tài)起決定作用。樣品經(jīng)870 ℃，12 min (40 MPa)放電等離子燒結(jié)及后續(xù)970 ℃, 2 h + 600 ℃, 1 h二級(jí)回火后，致密度達(dá)到7.39 g/cm3，剩磁達(dá)到1.08 T，矯頑力達(dá)到1181 kA·m-1。與同成分的傳統(tǒng)燒結(jié)磁體相比較，放電等離子燒結(jié)磁體中晶界相分布不連續(xù)、晶界相中的稀土元素相對(duì)含量因燒損而顯著下降以及晶界結(jié)構(gòu)存在一定程度的不平衡等問(wèn)題，都導(dǎo)致磁體的矯頑力較低。

    Abstract:

    Anisotropic magnets were synthesized by spark plasma sintering Nd11Dy2Gd2FebalAl4.0Nb0.8Zr0.8B6/Dy2O3 powder. The analyses of microstructure and magnetic property indicate that the sintering temperature determines the distribution of grain boundary phase in the magnets. After spark plasma sintering of 870 oC, 12 min (40 MPa) followed by tempering of 970 oC, 2 h + 600 oC, 1 h, the average density of samples reaches 7.39 g/cm3, residual magnetization is 1.08 T, and intrinsic coercive force is 1181 kA·m-1. The coercivity of the SPSed magnet is smaller than that of traditional sintered magnet with the same compositions, which is attributed to the discontinuous distribution of grain boundary phases, obvious decrease of rare earth relative contents in grain boundary phase because of their loss during the process, and some non-equilibrium structures in them.

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潘 晶,張 輝,劉新才,陳 威,賀琦軍,劉少艮.放電等離子燒結(jié)NdFeB的晶界結(jié)構(gòu)與矯頑力[J].稀有金屬材料與工程,2010,39(7):1284~1288.[Pan Jing, Zhang Hui, Liu Xincai, Chen Wei, He Qijun, Liu Shaogen. Grain Boundary Microstructure and Coercivity of NdFeB Magnet Prepared by Spark Plasma Sintering (SPS)[J]. Rare Metal Materials and Engineering,2010,39(7):1284~1288.]
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  • 收稿日期:2009-06-15
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