Nd-Fe-B-Co-Al based permanent magnets with improved magnetic properties and temperature characteristics

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Magnetic properties of Nd-Fe-B-Co-Al alloy magnets have been studied with respect to both boron and aluminum concentration. Both cobalt and aluminum substitution for iron is remarkably effective for increasing magnetic hardness in the low boron concentration region. The following magnetic properties were attained for Nd 15 Fe 62.5 B 5.5 Co 16 Al 1 : Br=13.2KG, iHc=11.0kOe, (BH) max =41.0MGOe and T c =500°C. The reversible temperature coefficient of remanence in the above magnet was -0.071%/°., approximately one-half that for the Nd 15 Fe 77 B 8 magnet. It was observed that Laves phase Nd(Fe, Co) 2 precipitates in cobalt containing magnets. The authors think that the addition of aluminum makes this Nd(Fe, Co) 2 magnetic phase non-magnetic; which is considered to be the cause of coercivity increase.

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