Method for producing neodymium-iron-boron rare earth permanent magnetic device

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A method for producing neodymium-iron-boron rare earth permanent magnetic materials mainly comprises processes of : alloy smelting, coarsely pulverization, milling, magnetic compaction, sintering, machining, vacuum heat treatment, and etc. Magnetic performance of permanent magnetic devices is increased by improving technologies of hydrogen pulverization, milling by jet mill, and vacuum heat treatment, in such a manner that usage amount of rare earth is decreased. The present invention is applicable in producing rare earth permanent magnetic materials having high performance.