Neodymium iron-boron magnet with high residual magnetic flux density and high coercivity, and method for manufacturing the same.

Abstract

This invention provides a neodymium-iron-boron magnet having high residual magnetic flux density and high coercivity, and a method for manufacturing the same. [Solution] Neodymium iron boron magnets are R2T 14 The neodymium iron boron magnet contains B main phase crystal grains and grain boundary phase A. The neodymium iron boron magnet contains R, M, B and Fe, where R contains RL and RH, where RL contains at least one of Pr, Nd, La, Ce and Y, where RH contains at least one of Dy, Tb, Gd and Ho, where M contains Co, Cu and optionally M', where M' contains one or more of Cr, Ni, Ga, Al, Zr, Nb and Ti, and the content of R in grain boundary phase A is 29-55 at%, the content of Co is 3-7 at%, and the content of Cu is 7-20 at%. The neodymium iron boron magnet according to the present invention has a low content of impurity elements, effectively increases the diffusion depth of heavy rare earth elements, and has high coercivity and high remanent magnetic flux density.

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