RARE-EARTH PERMANENT MAGNET AND METHOD FOR MANUFACTURING RARE-EARTH PERMANENT MAGNET

摘要

There are provided a rare-earth permanent magnet based on Nd—Fe—B, capable of improving coercive force through reducing a residual nitrogen concentration after sintering to be 800 ppm or lower, and a manufacturing method of the rare-earth permanent magnet. The rare-earth permanent magnet based on Nd—Fe—B is obtained through milling a magnet material in an atmosphere of a noble gas by dry milling, and thereafter, compacting the milled magnet material into a formed body in an atmosphere of a noble gas. The formed body is then sintered at 800 through 1180 degrees Celsius so as to obtain a permanent magnet 1 whose nitrogen concentration is 800 ppm or lower, or more preferably 300 ppm or lower.

主权项

1. A rare-earth permanent magnet based on Nd—Fe—B, wherein a residual nitrogen concentration after sintering is 800 ppm or lower.