Nd-Fe-B system permanent magnet
AssigneeHitachi Metals, Ltd.
InventorsMasaaki Tokunaga, Shigeho Tanigawa, Masahiro Takahashi
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Abstract
Disclosed is a Nd-Fe-B system magnet having coercive force iHc of 12 KOe or more and high maximum energy product (BH)max of 42 MGOe or more. The permanent magnet consists of 28 to 32 wt. % of Nd and Dy (Dy ranges from 0.4 to 3 wt. %), 6 wt. % or less of Co, 0.5 wt. % or less of Al, 0.9 to 1.3 wt. % of B, at least one of 0.05 to 2.0 wt. % of Nb and 0.05 to 2.0 wt. % of V, 0.02 to 0.5 wt. % of Ga, Fe and unavoidable impurities, having coercive force iHc of 12 KOe or more and maximum energy product (BH)max of 42 MGOe or more.
Claims15
A Nd-Fe-B permanent magnet comprising 28 to 32 wt. % of Nd and Dy, wherein Dy ranges from 0.4 to 3 wt. %, 6 wt. % or less of Co, 0.5 wt. % or less of Al, 0.9 to 1.3 wt. % of B, at least one of 0.05 to 2.0 wt. % of Nb and 0.05 to 2.0 wt. % of V, 0.02 to 0.5 wt. % of Ga, and Fe, and having a coercive force iHc of 12 KOe or more and a maximum energy product (BH)max of 42 MGOe or more, and wherein the Ga content in an Nd phase is two times or more of the added amount of Ga in the entire magnet.
A Nd-Fe-B permanent magnet comprising 28 to 32 wt. % of Nd and Dy, wherein Dy ranges from 0.4 to 3 wt. %, 0.3 wt. % or less of Al, 0.9 to 1.3 wt. % of B, at least one of 0.05 to 2.0 wt. % of Nb and 0.05 to 2.0 wt. % of V, 0.02 to 0.5 wt. % of Ga, and Fe, and having a coercive force of 12 KOe or more and a maximum energy product (BH)max of 42 MGOe or more, and wherein the Ga content in an Nd phase is two times or more of the added amount of Ga in the entire magnet.
Dependencies are inferred from the claim text.