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The role of milling atmosphere on microstructure and magnetic properties of a Nd12.8Fe79.8B7.4-type sintered magnet

Madaah Hosseini, H. R ; Sharif University of Technology | 2004

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmmm.2004.04.093
  3. Publisher: 2004
  4. Abstract:
  5. In this work, milled Nd12.8Fe79.8B7.4-type powders with three different oxygen contents were processed into sintered anisotropic magnets via a standard powder metallurgy technique. Minimizing the oxygen content within the powder material, resulted in an almost full densification in the sintered magnets even at the lower end of the sintering temperature limit. Under this condition, the amount of hard magnetic Φ phase (Nd2Fe14B) was maximized in the structure of sintered bodies, which resulted in the highest energy density [BHmax] values. In the sintered magnets made from the powder with a higher oxygen content, full densification could only be obtained at the upper end of the sintering temperature limit, but at the expense of development a large proportion of free α-iron within the structure of the magnets, which deteriorated the hard magnetic properties. © 2004 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Magnetic powder ; Magnetic properties ; Microstructure ; Milling atmosphere ; Nd-Fe-B alloys ; Oxygen content ; Sintering
  8. Source: Journal of Magnetism and Magnetic Materials ; Volume 281, Issue 1 , 2004 , Pages 92-96 ; 03048853 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0304885304005153