MANUFACTURING METHOD OF GREEN COMPACTS OF RARE EARTH ALLOY MAGNETIC POWDER AND A MANUFACTURING METHOD OF RARE EARTH MAGNET

摘要

The present invention discloses a manufacturing method of green compacts of rare earth alloy magnetic powder and a manufacturing method of rare earth magnet, it is a manufacturing method that pressing the rare earth alloy magnetic powder added with organic additive in a closed space filled with inert gases to manufacture the green compacts, wherein the rare earth alloy magnetic powder is compacted under magnetic field in a temperature atmosphere of 25° C.-50° C. and a relative humidity atmosphere of 10%-40%. This method is to set the temperature of the inert atmosphere in a fully closed space, inhibiting bad forming phenomenon of the magnet with low oxygen content (broken, corner-breakage, crack) after sintering, and increasing the degree of orientation, Br and (BH)max.

主权项

1. A manufacturing method of green compacts of rare earth alloy magnetic powder, it is a manufacturing method that pressing the rare earth alloy magnetic powder with organic additive in a closed space filled with inert gases to manufacture the green compacts, wherein the rare earth alloy magnetic powder is pressed under magnetic field in a temperature atmosphere of 25° C.-50° C. and a relative humidity atmosphere of 10%-40%, the rare earth alloy magnetic powder is made by following method: cooling the rare earth molten alloy in cooling rate between 100° C./s and 10000° C./s to get rapid cooling solidified alloy, then getting the rapid solidified alloy hydrogen decrepitation, using a fine-crusher to obtain the powder, the fine-crusher has controllable concentration of the oxide gas in the pulverizing room, the oxide gas is oxygen and/or water, the concentration is below 100 ppm.