MIXED RARE EARTH SINTERED PERMANENT MAGNET AND PREPARATION METHOD THEREOF

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The present invention provides a mixed rare earth sintered permanent magnet and preparation method thereof. The preparation method of the mixed rare earth sintered permanent magnet prepares the sintered permanent magnet by more than two kinds of alloys. The preparation method of the mixed rare earth sintered permanent magnet of the present invention may produce a sintered magnet with a magnetic energy product such as 2-45 MGOe and optional performance by adjusting proportions of each alloy according to need. A stable main phase of R2Fe14B can be formed by multi-alloy process. Because the permanent magnet is prepared directly by the mixed rare earth, steps of extraction, separation and purification for preparing a single rare earth can be partly saved on one hand, the cost is greatly saved and the environment is protected; the comprehensive utilization of the rare earth resource can be maximized on the other hand.