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放電等離子燒結(jié)新型NdFeB永磁材料研究
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TM273

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北京市教委科技發(fā)展面上項(xiàng)目(Km200310005019)


Study on A New Kind of NdFeB Magnet Prepared by Spark Plasma Sintering
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    摘要:

    研究了采用放電等離子燒結(jié)技術(shù)制備新型NdFeB永磁材料。重點(diǎn)考察了工藝條件對磁體的磁特性、尺寸精度和密度的影響。利用B-H回線儀、掃描電鏡和電子能譜對其磁特性、顯微組織結(jié)構(gòu)和成分進(jìn)行了分析測試，同時(shí)考察了材料在電解液中的電化學(xué)特性及其氧化腐蝕特性。結(jié)果表明：與傳統(tǒng)燒結(jié)NdFeB相比，這種新型NdFeB磁體的顯微組織明顯不同，其晶粒尺寸細(xì)小均勻，富釹相彌散分希；磁體的最佳磁特性為最大磁能積2401kJ／m^3矯頑力1260kA／m；密度達(dá)到7．58g／cm^3；尺寸精度為20μm；磁體同時(shí)具有良好的抗腐蝕性。

    Abstract:

    A new kind of NdFeB magnet was produced by spark plasma sintering technique. Magnetic properties, microstructure and constituents were investigated by means of B-H loop-line instrument, scanning electron microscope and energy dispersive X-ray detector. The effects of processing conditions on the magnetic properties, dimensional precision as well as density were studied. The electrochemical property in electrolytes and the corrosion behavior in oxidation environment were examined for the magnets. It is found that the microstructure of SPS NdFeB magnet is different from that of conventional one, the grain size is fine and uniform while the distribution of the Nd-rich phase is heterogeneous. The optimal magnetic properties of the SPS NdFeB magnets obtained so far are of a maximum energy product of 240 kJ / m3 and a coercive force of 1 260 kA/m. The density of the magnet reaches 7. 58 g/cm3 as well as the dimensional precision of the magnets is about 20 p.m. Meanwhile, the electrochemical property and the corrosion resistance of SPS NdFeB magnets are much better if compared with conventional one.

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岳明 王公平 張久興 周美玲 左鐵鏞.放電等離子燒結(jié)新型NdFeB永磁材料研究[J].稀有金屬材料與工程,2003,(10):844~847.[Yue Ming, Wang Gongping, Zhang Jiuxing, Zhou Meiling, Zuo Tieyong. Study on A New Kind of NdFeB Magnet Prepared by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2003,(10):844~847.]
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  • 最后修改日期:2003-02-12
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