[1]朱明剛,方以坤,李衛(wèi).高性能NdFeB復(fù)合永磁材料微磁結(jié)構(gòu)與矯頑力機(jī)制[J].中國(guó)材料進(jìn)展,2013,(2):001-20.[doi:10.7502/j.issn.1674-3962.2013.02.01]
ZHU Minggang,FANG Yikun,LI Wei.Microstructures and Coercivity Mechanism of High Performance Composite NdFeB Permanent Magnets[J].MATERIALS CHINA,2013,(2):001-20.[doi:10.7502/j.issn.1674-3962.2013.02.01]
點(diǎn)擊復(fù)制
高性能NdFeB復(fù)合永磁材料微磁結(jié)構(gòu)與矯頑力機(jī)制(
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中國(guó)材料進(jìn)展[ISSN:1674-3962/CN:61-1473/TG]
- 卷:
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- 期數(shù):
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2013年第2期
- 頁(yè)碼:
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001-20
- 欄目:
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特約研究論文
- 出版日期:
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2013-03-31
文章信息/Info
- Title:
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Microstructures and Coercivity Mechanism of High Performance Composite NdFeB Permanent Magnets
- 作者:
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朱明剛; 方以坤; 李衛(wèi)
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（鋼鐵研究總院功能材料研究所,北京 100081）
- Author(s):
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ZHU Minggang; FANG Yikun; LI Wei
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（Department of Functional Material，Central Iron & Steel Research Institute,Beijing 100081,China）
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- 關(guān)鍵詞:
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NdFeB復(fù)合永磁材料; 雙主相合金技術(shù); 磁疇; 反磁化行為
- DOI:
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10.7502/j.issn.1674-3962.2013.02.01
- 摘要:
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概述了近年來(lái)有關(guān)高性能NdFeB復(fù)合永磁材料矯頑力機(jī)制的研究進(jìn)展, 研究了工藝過(guò)程對(duì)矯頑力的影響機(jī)制和所適應(yīng)的理論模型，重點(diǎn)探討了雙主相合金技術(shù)制備的高性能永磁材料的微結(jié)構(gòu)特征與矯頑力的關(guān)系，嘗試解釋了雙主相合金技術(shù)制備的高性能永磁材料的矯頑力機(jī)制。由傳統(tǒng)的單合金或雙合金工藝制備磁體的矯頑力機(jī)制可用發(fā)動(dòng)場(chǎng)理論解釋，且與實(shí)際相符較好。探討了熱壓/熱流變磁體各向異性的形成，展示了熱退磁過(guò)程中燒結(jié)和熱壓/熱流變磁體疇結(jié)構(gòu)的演變規(guī)律。制備出最大磁能積約為424kJ/m3的各向異性納米晶NdFeB磁體，研究表明，各向異性的產(chǎn)生主要源于再結(jié)晶過(guò)程中晶粒的擇優(yōu)生長(zhǎng)和通過(guò)邊界液相所促進(jìn)的晶粒滑移和旋轉(zhuǎn)。揭示出高性能各向異性納米晶NdFeB磁體的典型磁疇結(jié)構(gòu)是一種交換耦合疇。交換耦合疇的溫度依賴關(guān)系是影響磁體使用溫度的主要因素。
- Abstract:
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In this paper, we review recent research advance on coercivity mechanism of high performance NdFeB permanent magnets. Influence of fabrication process on the coercivity of the magnets is discussed. In particular, the correlation between microstructure and coercivity is investigated for the magnets prepared by using binary main phase alloy technique. The coercivity mechanism of the magnets prepared by traditional powder metallurgical method or binary alloy technique is based on the starting field theory, and the theoretical result is consistent with the experimental one. Furthermore, the formation mechanism of magnetic anisotropy of hot deformed NdFeB magnets is also discussed. The evolution of magnetic domains of sintered and hot deformed NdFeB magnets during thermal demagnetization process is presented. High performance anisotropic nanocomposite NdFeB magnets with (BH)m of 424 kJ/m3 are prepared. The formation of anisotropy of the magnets is expected as the anisotropic grow up of grains and their rotation and slicing. The magnetic microstructures of the magnets are typical interaction domains. The results show that both microstructures and magnetic properties are strongly correlated to optimum coercivity mechanisms for NdFeB magnets.
更新日期/Last Update:
2013-01-31