RARE EARTH PERMANENT MAGNET MATERIAL AND MANUFACTURING METHOD THEREOF

摘要

The present invention provides a rare earth permanent magnet material and manufacturing method thereof. The manufacturing method of the present invention comprises a multi-arc ion plating step and a infiltrating step, wherein multi-arc ion plating process is adopted to deposit a metal containing a heavy rare earth element on a surface of a sintered neodymium-iron-boron magnet which has a thickness of 10 mm or less in at least one direction; and then heat treatment is performed on the sintered neodymium-iron-boron after deposition. The sum of an intrinsic coercive force (H cj , in unit of kOe) and a maximum magnetic energy product ((BH) max , in unit of MGOe) of the permanent magnet material of the present invention is 66.8 or more. Moreover, the manufacturing method of the present invention has high production efficiency and does not increase harmful substances, and the price of devices is relatively low.