标题：Anisotropic HDDR-treated Nd2Fe14B-type powder
作者：Liu Min; Han BaiPing; Han GuangBing; Gao RuWei
作者机构：[Liu, M] Department of Electronic Science, Huizhou University, Huizhou 516007, China, School of Physics, Shandong University, Jinan 250100, China;[ Ha 更多
通讯作者地址：[Liu, M]Huizhou Univ, Dept Elect Sci, Huizhou 516007, Peoples R China.
关键词：SC-HDDR process; SC alloy flakes; disproportionated microstructure;; anisotropic powders
摘要：Effects of the wheel speeds v and disproportionation time during the SC-HDDR process on the properties of Nd-Fe-B magnetic powders are investigated. It is found that the remanence B (r), coercivity H (cj) and energy products (BH)(max) of magnetic powders all first increase to the maximum at v=3 m/s, and then decrease with enhancing v. This is attributed to the fact that the SC alloy flakes prepared by the wheel speed of 3 m/s display the optimized microstructure. This optimized SC alloy flakes without homogenizing treatment which carried out a short duration disproportionation treatment can prepare the evidently anisotropic powders. With prolonging disproportionation time, the alignment degree of anisotropy of magnetic powders gradually decreases. This is due to the fact that a short duration disproportionation reaction is beneficial to the disproportionated microstructure displaying the lamella crystals, and the lamella disproportionated microstructure is helpful to the formation of anisotropy. Our results confirm that the anisotropic HDDR Nd-Fe-B magnetic powders prepared directly from the SC alloy flakes without homogenizing treatment can be obtained.