Development of a Co-free NdFeB anisotropic bonded magnet produced from the d-HDDR processed powder
Development of a Co-free NdFeB anisotropic bonded magnet produced from the d-HDDR processed powder
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DOI：
10.1109/20.951205
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发表时间：
2001-07
影响因子：
2.1
通讯作者：
C. Mishima;N. Hamada;H. Mitarai;Y. Honkura
中科院分区：
文献类型：
--
作者：
C. Mishima;N. Hamada;H. Mitarai;Y. Honkura
1990年开发的HDDR法生产的NdFeB各向异性粘结磁体由于其成本高和使用温度低（353 K）而没有得到普遍普及。作者开发了一种新的生产方法，克服了这些障碍，以降低成本并提高使用温度。采用动态HDDR（d-HDDR）工艺无需使用Co，从而大大降低了（BH）max为159 kJ/m/sup 3/的NdFeB各向异性粘结磁体的生产成本。通过控制HDDR工艺中的氢气压力，控制NdFeB合金与氢气的反应速率，从而引起NdFeB磁粉的各向异性。应用d-HDDR方法后，通过添加Dy提高了使用温度。内禀矫顽力 iHc 从 1.12 MA/m 增加到 1.56 MA/m，对应于可用温度成比例增加到 413 K。
The NdFeB anisotropic bonded magnet produced by the HDDR method, which was developed in 1990, has not found general popularity due to its high cost and low serviceable temperature of 353 K. The authors have developed a new production method that overcomes these barriers to decrease the cost and increase the serviceable temperature. The use of the dynamic HDDR (d-HDDR) process eliminates the need for Co, thus greatly reducing the production cost of NdFeB anisotropic bonded magnets with a (BH) max of 159 kJ/m/sup 3/. The anisotropy of the NdFeB magnetic powder is induced by the control of the reaction rate of the NdFeB alloy and hydrogen, by controlling the hydrogen pressure in the HDDR process. The serviceable temperature is increased by the addition of Dy after the application of the d-HDDR method. An increase in intrinsic coercivity, iHc, from 1.12 MA/m to 1.56 MA/m, corresponds to a proportional increase in the serviceable temperature to 413 K.