Affiliation:
1. Nanjing University of Science and Technology
2. Qingdao University
Abstract
In this work, the cladless hot isostatic pressing (HIP) is performed on sintered NdFeB magnets. After the processings, the density of the magnets is slightly increased. The statistics of microstructure shows the growth of grains. The evaluation by X-ray diffraction shows that the alignment degree of grains decreases. These effects slightly improve the magnetic energy products, meanwhile bring about the deterioration of coercivity. Corresponding to the increase of density, the corrosion resistance checked by electrochemistry method becomes better after HIP processings.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference14 articles.
1. M. Sagawa, S. Fujimura, N. Togawa, H. Yamamoto, Y. Matsuura, New material for permanent magnets on a base of Nd and Fe, J. Appl. Phys. 55 (1984) 2083-(2087).
2. D. Brown, B.M. Ma, Z.M. Chen, Developments in the processing and properties of NdFeB-type permanent magnets, J. Magn. Magn. Mater. 248 (2002) 432-440.
3. G.L. Yan, A.J. Williams, J.P.G. Farr, I.R. Harris, The effect of density on the corrosion of NdFeB magnets, J. Alloys. Compd. 292 (1999) 266-274.
4. M.X. Guan, Application of hot isostatic presses in power metallurgy, Tianjin Metall. 104 (2001) 41-44.
5. S.J. Mash, Hot isostatic pressing: more than a niche technology, Int. J. Powder Metall. 44 (2008) 27-30.