Correlation between microstructure and magnetic properties of Nd-Fe-Cr-B magnets

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/20.104820· OSTI ID:5876873

Leonowicz, M ^[1]

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1. Inst. for Materials Science and Engineering, Warsaw Univ. of Technology, Narbutta 85, 01-524 Warszawa (PL)

Sintered magnets of composition (Nd{sub 16}Fe{sub 76}B{sub 8}){sub 1{minus}x}Cr{sub x} and (Nd{sub 18}Fe{sub 74}B{sub 8}){sub 1{minus}x}Cr{sub x} have been prepared by blending of Cr powders, of different particle sizes, with the master magnet powder, before sintering. Cr addition effects in changes of the coercive field strength depending on the amount and particle sizes of the Cr powder. Coercivity increase is caused by pinning of domain walls at small inclusions in the intermediate phase and by improved isolation of the hard magnetic grains. Deterioration of coercivity results from a decrease of the intrinsic properties of Nd{sub 2}(Fe,Cr){sub 14}B phase and nucleation of domain walls at large FeCr inclusion.

• OSTI ID: 5876873
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA) Vol. 26:5; ISSN 0018-9464; ISSN IEMGA
• Country of Publication: United States
• Language: English

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