MANUFACTURING METHODS OF A POWDER FOR RARE EARTH MAGNET AND THE RARE EARTH MAGNET BASED ON EVAPORATION TREATMENT
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United States of America Patent
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Dec 10, 2015
app pub date -
Dec 31, 2013
filing date -
Dec 31, 2012
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Abstract
A manufacturing method of a powder for rare earth magnet and the rare earth magnet based on evaporation treatment, includes the steps of: coarsely crushing an alloy for the rare earth magnet and then finely crushing to obtain a fine powder; and evaporating the fine powder and an evaporation material in vacuum or in inert gas atmosphere; wherein the weight ratio of the evaporation material evaporated to the fine powder and the fine powder is 10-6˜0.05:1. By adding the process of evaporation treatment of fine powder before the process of compacting under a magnetic field and after the process of fine crushing, the sintering property of the powder is changed drastically; a magnet with a high coercivity, a high squareness and a high heat resistance is obtained.
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