Effect Of The Desorption-Recombination Temperature On The Microstructure And Magnetic Properties Of HDDR Processed Nd-Fe-B Powders

Archives of Metallurgy and Materials

H.-W. Kwon¹  J.-H. Yu¹  H.-R. Cha¹  Y.-K. Baek³  S. Liu³  J.-G. Lee³ 

[1] CERAMICS DIVISION, KOREA INSTITUTE OF MATERIALS SCIENCE, 797 CHANGWONDAERO, CHANGWON 642-831, KOREA;DEPARTMENT OF MATERIALS SCIENCE AND ENGINEERING, PUKYONG NATIONAL UNIVERSITY, 45 YONGSO-RO, NAM-GU, BUSAN 608-737, KOREA;POWDER&

关键词: Keywords: Nd-Fe-B;    HDDR;    permanent magnet;    grain boundary;   

DOI  :  10.1515/amm-2015-0160

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The effect of the desorption-recombination temperature on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-B powders was studied. The NdxB6.4Ga0.3Nb0.2Febal (x=12.5-13.5, at.%) casting alloys were pulverized after homogenizing annealing, and then subjected to HDDR treatment. During the HDDR process, desorption-recombination (DR) reaction was induced at two different temperature, 810°C and 820°C. The higher Nd content resulted in enhanced coercivity of the HDDR powder, and which was attributed to the thicker and more uniform Nd-rich phase along grain boundaries. But this uniform Nd-rich phase induced faster grain growth. The remanence of the powder DR-treated at 820°C is higher than that DR-treated at 810°C. In addition, it was also confirmed that higher DR temperature is much more effective to improve squareness.

【 授权许可】

Unknown