发明名称 |
R-T-B BASED RARE EARTH ELEMENT PERMANENT MAGNET |
摘要 |
An R-T-B system rare earth permanent magnet, which is a sintered body comprising: a main phase consisting of an R2T14B phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y), and T represents one or more transition metal elements essentially containing Fe, or Fe and Co); and a grain boundary phase containing a higher amount of R than the above main phase, wherein a product that is rich in Zr exists in the above R2T14B phase. The product that is rich in Zr has a platy or acicular form. The R-T-B system rare earth permanent magnet containing the product enables to inhibit the grain growth, while keeping a decrease in magnetic properties to a minimum, and to obtain a wide suitable sintering temperature range. <IMAGE>
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申请公布号 |
EP1460650(A1) |
申请公布日期 |
2004.09.22 |
申请号 |
EP20030748612 |
申请日期 |
2003.09.30 |
申请人 |
TDK CORPORATION |
发明人 |
ISHIZAKA, CHIKARA;NISHIZAWA, GOUICHI;HIDAKA, TETSUYA;FUKUNO, AKIRA;UCHIDA, NOBUYA |
分类号 |
H01F1/055;H01F1/057;H01F41/02;(IPC1-7):C22C1/04;H01F1/053;C22C33/02;H01F1/047 |
主分类号 |
H01F1/055 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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