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

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method in which a rare earth permanent magnet can be produced industrially easily by preliminarily compressing rare earth-iron-nitrogen magnet powder and then compacting the preform.

SOLUTION: After an oxide film previously containing 0.2 to 1.6 wt.% oxygen for the total amount is formed on the surface of the rare earth-iron-nitrogen magnet powder, the magnet powder having the oxide film is preliminarily compressed in a specified shape in a non-oxidizing atmosphere to form a preform of ≥40% in relative density, and then a magnet compact of ≥85% in relative density is obtained by compacting the preform at a temperature of 350 to 500°C in a non-oxidizing atmosphere.

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