| 高磁能积NdFeB永磁体的热退磁机理分析 |
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| 引用本文： | 陈杰,程玲莉,张明,徐光亮,高旭山. 高磁能积NdFeB永磁体的热退磁机理分析[J]. 磁性材料及器件, 2012, 43(3): 49-52,61. DOI: 10.3969/j.issn.1001-3830.2012.03.013 |
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| 作者姓名： | 陈杰 程玲莉 张明 徐光亮 高旭山 |
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| 作者单位： | 1.西南科技大学材料科学与工程学院,四川绵阳621010;西南应用磁学研究所,四川绵阳621000;2.西南应用磁学研究所,四川绵阳,621000;3.西南科技大学材料科学与工程学院,四川绵阳,621010 |
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| 基金项目： | 国家重大科技专项(2008ZX01006-005) |
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| 摘 要： | 对高磁能积NdFeB永磁体的热退磁机理进行了分析.首先测量并研究永磁体开路磁通随温度的宏观变化,然后采用多功能显微镜.热分析仪及X射线衍射仪观察了高温金相形貌并分析了物相和表面成分变化,借助磁力显微镜观察了磁畴结构,从而分析了永磁体的热退磁机理.高温金相观察结果表明,在320℃以内,除金相形貌的颜色发生变化外,晶粒形状及尺寸均未发生明显变化;XRD分析表明,金相形貌的颜色变化是表面氧化所致,说明磁体在320℃以内的热退磁现象与金相结构无关,即热退磁不是由金相结构变化引起的.320℃以后,XRD及高温金相分析表明表面氧化变严重,尤其在580℃时有富Nd相熔融物析出,晶界模糊、大晶粒吞并小晶粒,金
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| 关 键 词： | NdFeB磁体 热退磁 磁通 金相形貌 磁畴结构 |
Study on thermal demagnetizing mechanisms of high-energy product NdFeB permanent magnet |
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| CHEN Jie , CHENG Ling-li , ZHANG Ming , XU Guang-liang , Gao Xu-shan. Study on thermal demagnetizing mechanisms of high-energy product NdFeB permanent magnet[J]. Journal of Magnetic Materials and Devices, 2012, 43(3): 49-52,61. DOI: 10.3969/j.issn.1001-3830.2012.03.013 |
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| Authors: | CHEN Jie CHENG Ling-li ZHANG Ming XU Guang-liang Gao Xu-shan |
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| Affiliation: | 1.School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China; 2.Southwest Institute of Applied Magnetics,Mianyang 621000,China |
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| Abstract: | The demagnetization mechanism of high energy product NdFeB permanent magnet was analyzed.Firstly,changes of open-circuit magnet flux with temperature were studied.And then high-temperature metallurgical phase as well as surface composition changes were observed and analyzed using multi-functional metallographic microscope,thermal analysis instrument and X-ray diffraction,respectively.Finally we studied the phase magnetic domain structure of sintered NdFeB permanent magnet after magnetization and high-temperature treatment using magnetic force microscopy(MFM).The experimental results showed that in addition to changes in color of microstructure morphology,no obvious change occurs in grain shape and size below 320℃.XRD analysis showed that the color change is due to surface oxidation,which indicates that thermal demagnetization below 320℃ has nothing to do with the metallurgical structure.XRD and metallographic analysis also showed that surface oxidation becomes serious above 320℃,especially at 580℃ melting Nd-rich phase precipitates,the grain boundary became fuzzy and large grain annexes small one.However,magnetic domain observation showed that,magnetization direction changes after thermal demagnetization below 320℃,which is the fundamental reason for thermal demagnetization. |
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| Keywords: | NdFeB permanent magnet thermal demagnetization flux metallurgical morphology magnetic domain structure |
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