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高汝伟
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-1年11月30日
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【期刊论文】Effects of orientation and interaction of grains on coercivity for sintered NdFeB magnets
高汝伟
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-1年11月30日
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高汝伟
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-1年11月30日
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高汝伟, R.W. Gao, a), W.C. Feng, H.Q. Liu, B. Wang, W. Chen, G.B. Han, P. Zhang, and H.Li W.Li, Y.Q. Guo, W. Pan, X.M. Li, and M.G. Zhu, X. Li
J. Appl. Phys., Vol. 94, No.1, 1 July 2003,-0001,():
-1年11月30日
The inter-grain exchange-coupling interactions, effective anisotropy, and coercivity in nanocomposite Nd2Fe14B/a-Fe magnets were investigated. The effective anisotropy of nanocomposite magnets has been calculated starting from the statistics of boundaries between magnetically hard-hard, hard-soft, and soft-soft grains. The result shows that the effective anisotropy decreases with reduction in grain size and/or increase in soft phase components. When grain sizes reduce to 4-5nm, Keff decreases to 1/3-1/4 of the ordinary value of K. The coercivity in nanocomposite magnets demonstrates a similar behavior. The decrement of coercivity is mainly due to the reduction of effective anisotropy. Considering the opposite varying trend the remanence demonstrates with respect to the effective anisotropy and the coercivity, we conclude that the mean grain size should be in the range of 10-15nm and the volume fraction of soft phase should be less than 50% in order to achieve high energy product magnets.
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高汝伟, R.W. Gao, D.H. Zhang, H. Li, J.C. Zhang
Appl. Phys. A 67, 353-356 (1998),-0001,():
-1年11月30日
The effects of the alignment degree of grain "easyaxes" on the hard magnetic properties of NdFeB sintered magnets have been investigated. The results show that the remanence polarisation Jr increases monotonously with an enhancement in the degree of grain alignment (i.e. decrease in the orientation coefficient
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