Title :
Microstructure of Zr containing NdFeB
Author :
Kim, A.S. ; Camp, F.E.
Author_Institution :
Res. Center, Crucible Mater. Corp., Pittsburgh, PA, USA
fDate :
9/1/1997 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
