发明名称 |
Ferrite magnet powder and magnet using said magnet powder, and method for preparing them |
摘要 |
An La-Co ferrite magnet powder, in which Sr and Fe are replaced with La and Co, respectively, is made by carrying out a calcination process at a temperature higher than 1300° C. and equal to or lower than 1450° C. Fe has a magnetic moment oriented upwardly with respect to a crystal c-axis at a number of sites thereof, and also has an opposite magnetic moment oriented downwardly with respect to the crystal c-axis at another number of sites thereof. And Fe is replaced with Co at the greater number of sites thereof. As a result, high coercivity is attained. In this manner, coercivity can be increased while suppressing decrease in saturation magnetization sigmas.
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申请公布号 |
US6419847(B1) |
申请公布日期 |
2002.07.16 |
申请号 |
US20000582238 |
申请日期 |
2000.07.19 |
申请人 |
SUMITOMO SPECIAL METALS CO., LTD. |
发明人 |
TOYOTA SACHIO;HOSOKAWA SEIICHI;ANAMOTO SHUJI;FURUCHI ISAMU |
分类号 |
C01G49/00;C01G51/00;C04B35/26;H01F1/11;(IPC1-7):H01F1/11;C01G49/08;C04B35/40 |
主分类号 |
C01G49/00 |
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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