Microstructures and magnetic properties of Sm(CobalFe0.245Cu0.07Zr0.02)7.8 sintered magnet solution-treated at high temperature
Microstructures and magnetic properties of Sm(CobalFe0.245Cu0.07Zr0.02)7.8 sintered magnet solution-treated at high temperature
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DOI：
10.1007/s12598-016-0813-5
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发表时间：
2016-12
期刊：
影响因子：
8.8
通讯作者：
Wei Sun;Minggang Zhu;Yikun Fang;Zhao-Hui Guo;Wei Li
中科院分区：
文献类型：
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作者：
Wei Sun;Minggang Zhu;Yikun Fang;Zhao-Hui Guo;Wei Li
钐（CoFeCuZr）锆烧结永磁体以其高温磁性能、低温系数低和良好的耐腐蚀、抗氧化性而备受关注。研究了传统粉末冶金法制备的Sm(CobalFe0.245Cu0.07Zr0.02)7.8烧结永磁体的组织和磁性能。通过调节固溶处理温度可以获得可调的磁性能，特别是最大磁能积（BH）max。随着固溶处理温度从1155℃升高到1195℃，剩余物（Br）基本保持不变，拐点矫顽力（Hk）、磁感应矫顽力（Hcb）和磁感应矫顽力（BH）先增大后减小。1195℃固溶磁体的本征矫顽力（Hcj）为738 kA·m−1，小于1183℃固溶磁体（>1927 kA·m−1）的2/5。1195°C处理的磁体溶液比1183°C处理的磁体溶液显示出更低的hcjd，主要原因是存在大量尺寸异常小的细胞。此外，标引高分辨率转换电镜（HRTEM）结果显示，1195℃下Sm(CobalFe0.245Cu0.07Zr0.02)7.8烧结永磁体溶液处理的晶格常数与形成异常小尺寸的细胞有关，从而降低了hcj。
Sm(CoFeCuZr)zsintered permanent magnet has been attracting a great deal of attention by virtue of its high-temperature magnetic properties, low temperature coefficient and good corrosion and oxidation resistance. The microstructures and magnetic properties of Sm(CobalFe0.245Cu0.07Zr0.02)7.8sintered permanent magnet prepared by a traditional powder metallurgy method were investigated. Tunable magnetic properties, especially the maximum magnetic energy product, (BH)max, were obtained through adjusting solution-treated temperatures. With solution-treated temperature increasing from 1155 to 1195 °C, remanence (Br) almost keeps constant and knee point coercivity (Hk), magnetic induction coercivity (Hcb) and (BH)maxfirst increase and then decrease. The intrinsic coercivity (Hcj) of magnet solution-treated at 1195 °C is 738 kA·m−1, which is less than 2/5 that of magnet solution-treated at 1183 °C (>1927 kA·m−1). The reason that magnet solution-treated at 1195 °C shows lowerHcjthan magnet solution-treated at 1183 °C is considered to be mainly related to the fact that there are a lot of cells with abnormally small size. In addition, the lattice constant of Sm(CobalFe0.245Cu0.07Zr0.02)7.8sintered permanent magnet solution-treated at 1195 °C, given by indexing high-resolution transition electron microscope (HRTEM) results, is considered to be related to the formation of cells with abnormally small size which decreasesHcj.