Microstructure of Zr containing NdFeB

Author

Kim, A.S. ; Camp, F.E.

Author_Institution

Res. Center, Crucible Mater. Corp., Pittsburgh, PA, USA

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3823

Lastpage

3825

Abstract

Simultaneous additions of Co, Al, and Zr to Nd(Dy)FeB alloys substantially improve the coercivity and corrosion resistance, and somewhat increases the Curie temperature. It was found that the microstructure of starting materials affects the final magnetic properties of the resulting sintered magnets. A cast ingot having α-Fe with Nd₂Fe₁₄B, Nd-rich and Zr-rich phases has generated higher coercivity than a homogenized ingot without α-Fe. This may be explained by the grain boundary phase change of the resulting sintered magnets

Keywords

Curie temperature; aluminium alloys; boron alloys; cobalt alloys; coercive force; corrosion; crystal microstructure; dysprosium alloys; ferromagnetic materials; grain boundaries; iron alloys; neodymium alloys; permanent magnets; powder metallurgy; sintering; zirconium alloys; α-Fe; Al additions; Co additions; Curie temperature; Nd(Dy)FeB:Co,Al,Zr; Nd-Dy-Fe-B-Co-Al-Zr; Nd-rich phases; Nd₂Fe₁₄B; Zr additions; Zr-rich phases; cast ingot; coercivity; corrosion resistance; final magnetic properties; grain boundary phase change; homogenized ingot; microstructure; simultaneous additions; sintered magnets; starting materials; Aluminum alloys; Cobalt alloys; Coercive force; Corrosion; Magnetic materials; Magnetic properties; Magnets; Microstructure; Temperature; Zirconium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619583

Filename

619583