Method for preparing corrosion resistance rare earth permanent-magnetic material

Abstract

This invention discloses a preparation method for anti-corrosion rare earth magnet material characterizing that it takes the optimized grain-boundary phase design as the starting point on the basis of a dual alloy method to select Nd base alloy with high crystal forming ability as the assist alloy and reduces the temperature of the press mold blank in a quartz container to room temperature from over grain-boundary phase melting point with the water extraction way to get enough cooling rate and guarantee the non-grain-boundary phase, compared with the material of the same composition prepared by ordinary method, the weightlessness of this invented material reduces over 30% after testing the weightlessness of the material by laying it for 96 hours under 121deg.C, 2 atmosphere and 100% humid environment to show the advanced performance of anti-corrosion.

Description

a technical field

[0001] The invention relates to a preparation method of a magnetic material, in particular to a preparation method of a corrosion-resistant rare earth permanent magnet material. Two background technology

[0002] At present, sintered NdFeB rare earth permanent magnet materials prepared by powder metallurgy technology have been widely used in many fields such as electronics, automobiles, computers, electric power, machinery, energy, environmental protection, national defense, and medical equipment due to their excellent magnetic properties. The sintered NdFeB rare earth permanent magnet material is mainly composed of a matrix phase and a rare earth-rich phase. Among them, the atomic ratio of the matrix phase is close to Nd:Fe:B=2:14:1, which constitutes the main phase of the microstructure, while the rare earth-rich phase, also known as the grain boundary phase, is distributed along the grain boundary and plays an exchange coupling role. It is beneficial to...

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