Isotropic bonded rare earth permanent magnetic material and preparation method thereof

Abstract

The invention discloses an isotropic bonded rare earth permanent magnetic material and a preparation method of the isotropic bonded rare earth permanent magnetic material. The permanent magnet material comprises, by weight, 84-94% NdFeB magnetic powder, 5-15% of nylon and 0.1% -1.0% of lubricant. The preparation method comprises the following steps that the NdFeB magnetic powder, nylon 6 and nylon 12 are selected according to a proportion, and are placed into a ball mill and sieved and crushed; the raw materials are poured into a mixing machine to be mixed and stirred; the raw materials are poured into an internal mixer to be internally mixed and squeezed, and lithium stearate is added; the raw materials are poured into a granulator to be diced; the raw materials are put into an oven to be dried; the raw materials are injected into a mold though an injection machine to be formed. The isotropic bonded rare earth permanent magnetic material and the preparation method of the isotropic bonded rare earth permanent magnetic material have the advantages that the weight of injection molding magnetic remanence Br is larger than or equal to 6.75kGs, the intrinsic coercivity Hcj is larger than or equal to 8kOe, and the maximum energy product is larger than or equal to 8MGOe; due to the isotropic bonded rare earth permanent magnetic material and the preparation method of the isotropic bonded rare earth permanent magnetic material, the annual capacity of isotropic bonded magnet injection molding production lines can reach 20 tons or more.

Description

technical field [0001] The invention relates to an isotropic rare earth bonded permanent magnet material and a preparation method thereof. Background technique [0002] The existing isotropic rare earth bonded permanent magnet materials, due to unreasonable raw material ratio and process, lead to serious loss of magnetic properties during the preparation process, and the final magnet performance is not ideal. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the invention provides an isotropic rare earth bonded permanent magnet material and a preparation method thereof. [0004] For realizing this technical purpose, the scheme that the present invention adopts is: [0005] An isotropic rare earth bonded permanent magnet material comprises the following raw materials in weight percentage: 84%-94% of NdFeB magnetic powder, 5%-15% of nylon, and 0.1%-1.0% of lubricant. [0006] The nylon is composed of nylon 6 and nylon 12 in a w...

AI Technical Summary

Problems solved by technology

[0002] The existing isotropic rare earth bonded permanent magnet materials, due to the unreasonable raw material ratio and p