CORROSION-RESISTANT SINTERED NEODYMIUM-IRON-BORON MAGNET RICH IN LANTHANUM AND CERIUM, AND

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The present invention discloses a corrosion-resistant sintered NdFeB magnet and a manufacturing method. The method comprises the following operation steps : preparing a NdFeB rare earth permanent magnet material alloy; preparing an alloy material rich in Co; breaking the NdFeB rare earth permanent magnet material alloy; uniformly mixing the prepared alloy material rich in Co into NdFeB rare earth permanent magnet material alloy powder according to a certain mass percentage; pressing and molding the mixed alloy powder into a blank in an oriented magnetic field ‰¥1.5T under the protection of a nitrogen atmosphere; placing the molded blank in a high-vacuum sintering furnace for high-temperature sintering, and performing a two-stage tempering process to obtain the corrosion-resistant sintered NdFeB magnet. The present invention has the beneficial effects that more Co elements in the magnet are distributed on a grain boundary of the magnet through the innovation of the manufacturing method, and the corrosion resistance of the magnet is improved on the basis of ensuring the magnetic property of the magnet.