Fabrication of ultrafine Nd-Fe-B powder by a modified reduction-diffusion process

被引：8
|
作者：
Jang, T. S.
Lee, D. H.
Yu, J. H.
Choi, C. J.
Seo, W. S.
Lee, Y. H.
机构：
[1] Department of Electronic Materials Engineering, Sunmoon University
[2] Powder Materials Research Center, Korea Institute of Machinery and Materials
[3] Advanced Materials Analysis and Evaluation Center, Korea Institute of Ceramic Engineering and Technology
来源：
RARE METALS | 2006年 / 25卷 / 223-226期
关键词：
NdFeB powder; spray drying; reduction-diffusion process; Nd2Fe14B; magnetic powder;
D O I：
10.1016/S1001-0521(08)60086-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In order to obtain ultrafine Nd-Fe-B powder, a spray-dried precursor was treated by reduction-diffusion (R/D) process. And, unlike the conventional R/D process, calcium reduction that is a crucial step for the formation of Nd2Fe14B was performed without conglomerating the precursor with Ca powder. By adopting this modified process, it is possible to synthesize the hard magnetic Nd2Fe14B at the reaction temperature as low as 850 degrees C. The average size of Nd2Fe14B particles that are uniformly distributed in the optimally treated powder was << 1 mu m. Most Nd2Fe14B particles were enclosed with thin layers of Nd-rich phase. Typical magnetic properties of such powder without eliminating impurity CaO were H-i(c) = similar to 5.9 kOe, B-r = similar to 5.5 kG, and (BH)(max) = similar to 6 MGOe.
引用
收藏
页码：223 / 226
页数：4
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