Affiliation:
1. Chongqing University of Science and Technology
2. Chongqing University of Technology
Abstract
The Nd-Fe-B powder was prepared to bulk by cold pressing, and then was hot-deformed by the vacuum hot-pressing machine. Effects of hot-deformation temperature and rate on the density, anisotropy, performance and microstructure were studied. The results showed that the grain size was small, but the density and orientation degree was low, thus leading to poor performance when the deformation temperature was too low or deformation rate was too large. When the temperature was higher than 750 °C or the rate was lower than 0.1mm/s, the anisotropic magnets with good density and texture could be obtained. However, the magnetic properties of hot-deformed magnets deteriorated due to the present of coarse grains. From the microstructure of hot-deformed magnets it could be seen that there were plenty of coarse and irregular grains, which have a higher Nd content than the plate-like grains. The optimum magnetic properties could be obtained at deformation temperature of 700 °C and rate of 0.1 mm/s.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference11 articles.
1. S. Z. Zhou, Q. F. Dong, Super permanent magnets-thulium materials, second ed., Metallurgy Industry Press, Beijing, (2004).
2. R. K. Mishra, Microstructure of hot-pressed and die-upset NdFeB magnets, J. Appl. Phys. 62 (1987) 967-971.
3. D. Li, S. Bauser, A. Higgins, et al., Bulk anisotropic composite rare earth magnets, J. Appl. Phys., 99 (2006) 08B516-1-3.
4. R. W. Lee, Hot-pressed neodymium-iron-boron magnets, Appl. Phys. Lett., 46 (1985) 790-791.
5. H. T. Kim, Y. B. Kim, J. W. Jeon, et al., High-performance nanocrystalline NdFeB magnets by CAPA process, J. Magn. Magn. Mater. 304 (2006) e240-e242.
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献