Anisotropic Nd/sub 2/Fe/sub 14/B based magnet powders with high remanences produced by modified HDDR process
Anisotropic Nd/sub 2/Fe/sub 14/B based magnet powders with high remanences produced by modified HDDR process
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采用改进的 HDDR 工艺生产的具有高剩磁的各向异性 Nd/sub 2/Fe/sub 14/B 基磁粉
DOI：
10.1109/20.800489
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
K. Oki
中科院分区：
文献类型：
--
作者：
K. Morimoto;R. Nakayama;K. Mori;K. Igarashi;Y. Ishii;Masaru Itakura;N. Kuwano;K. Oki
氢化-分解-解吸-复合（HDDR）工艺是制备各向异性Nd/sub 2/Fe/sub 14/ b基磁粉的一种独特方法。在本研究中，我们研究了添加中间Ar （IA）处理的影响，即在HDDR工艺中，氢化材料在抽真空处理之前在Ar气氛下退火，对磁粉磁性能的影响。结果表明，IA处理能有效地提高粉末的磁性各向异性。IA处理制备的各向异性粘结磁体的最佳磁性能为Nd/sub 12.6/Fe/sub bal。/Co/sub 17.4/B/sub 6.5/Zr/sub 0.1/Ga/sub 0.3/粉末分别为：B/sub r/=1.06 T, H/sub cJ/=992 kA/m, (BH)/sub max/=193 kJ/m/sup 3/。结果表明，IA处理诱导合金分解后的混合物中a/ spl α /-(Fe,Co)晶粒快速长大。合金的这种显微组织变化被认为与最终磁铁粉末的首选晶体取向密切相关。
The hydrogenation-decomposition-desorption-recombination (HDDR) process is a unique method to produce anisotropic Nd/sub 2/Fe/sub 14/B-based magnet powder for bonded magnet application. In this study, we studied the effect of appending the intermediate Ar (IA) treatment, i.e., hydrogenated materials are annealed under an Ar atmosphere before the evacuation treatment in the HDDR process, on the magnetic properties of magnet powder. It was found that the IA treatment is very effective to enhance magnetic anisotropy of the powder. The optimum magnetic properties of the anisotropic bonded magnet made from the IA treatment processed Nd/sub 12.6/Fe/sub bal./Co/sub 17.4/B/sub 6.5/Zr/sub 0.1/Ga/sub 0.3/ powder are as follows: B/sub r/=1.06 T, H/sub cJ/=992 kA/m, and (BH)/sub max/=193 kJ/m/sup 3/. It was observed that the IA treatment induces rapid growth of a /spl alpha/-(Fe,Co) grains in the decomposed mixture of the alloy. This microstructural change of the alloy is considered to be strongly related to the preferred crystallographic orientation of the final magnet powder.