发明名称 |
SINTERED MAGNET, MOTOR AND AUTOMOBILE |
摘要 |
PROBLEM TO BE SOLVED: To provide a sintered magnet that is superior in residual flux density and coercivity.SOLUTION: The sintered magnet includes a group of crystal grains 2 for an R-T-B rare-earth magnet having a core 4, a first shell 6 for covering the core 4 and a second shell 8 for covering the first shell 6. Percentage of the mass of heavy rare earth elements in the first shell 6 is higher than the percentage of the mass of heavy rare earth elements in the core 4, and the percentage of the mass of heavy rare-earth elements in the second shell 8 is higher than the content rate of the heavy rare elements in the first shell 6. |
申请公布号 |
JP2011211068(A) |
申请公布日期 |
2011.10.20 |
申请号 |
JP20100079022 |
申请日期 |
2010.03.30 |
申请人 |
TDK CORP |
发明人 |
IWASAKI MAKOTO;ISHIZAKA TSUTOMU;BABA FUMITAKA;TANAKA SATORU |
分类号 |
H01F1/053;B22F3/24;C22C19/07;C22C38/00;H01F1/08;H01F41/02 |
主分类号 |
H01F1/053 |
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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