FINE POWDER HEAT TREATMENT-BASED METHOD FOR MANUFACTURING RARE-EARTH MAGNET

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A fine powder heat treatment-based method for manufacturing a rare-earth magnet. A rare-earth magnet is crushed by using coarse alloy powders; fine powders are obtained by performing micro-grinding by using a jet milling; heat treatment is performed on the fine powders in a period longer than 6 minutes and shorter than 24 hours in a temperature of 100 to 1000 degrees centigrade in vacuum or inert gas; then, forming is performed by using a magnetic field forming method; sintering is performed in a temperature of 900 to 1140 degrees centigrade in vacuum or inert gas, so as to obtain a sintered body of the rare-earth magnet; the sintered body is treated to obtain the magnet; and then, RH grain boundary diffusion is performed in a temperature of 700 to 1020 degrees centigrade.