GRAIN-SIZE DEPENDENCE OF COERCIVITY OF SINTERED ND-FE-B PERMANENT-MAGNETS

被引：0
|
作者：
TANG, WH [1 ]
ZHOU, SZ [1 ]
HU, B [1 ]
机构：
[1] CHINESE ACAD SCI,XIN HUAN TECHNOL CO LTD,BEIJING 100080,PEOPLES R CHINA
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1991年 / 94卷 / 1-2期
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D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The grain size dependence of intrinsic coercivity H(c) of sintered Nd-Fe-B permanent magnets is investigated. It is confirmed that small grain sizes are connected with high H(c) values, and that for magnets with different grain sizes, their coercivity can be expressed by the formula mu-0H(c) = N(e) (k-mu-0H(A) - N(i)I(s)), where H(A) and I(s) denote the magnetic anisotropy field and spontaneous magnetization of the hard magnetic Nd2Fe14B phase, respectively, and k and N(i) are thought to be two constants related to the perfectness and the demagnetization field of isolated grains, and N(e) a parameter inversely changing with the grain size. It is suggested that in analyzing the coercivity mechanism of the Nd-Fe-B magnets, the effect of magnetic interactions between individual magnetic grains should also be considered.
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页码：67 / 73
页数：7
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