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Preparation process of neodymium-iron-boron /ferrite composite magnet body for permanent magnet alternating current synchronous motor

A technology of AC synchronous motors and composite magnets, applied in the manufacture of stator/rotor bodies, etc., can solve the problems of low strength, low performance of permanent magnets, and low density of magnets, and achieve high performance, high density, and low cost.

Inactive Publication Date: 2012-01-18
邓上云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the methods for making magnets for permanent magnet AC synchronous motors generally include warm compression molding and injection molding. Both warm compression molding and injection molding are common powder metallurgy molding techniques. For warm compression molding, this method has inherent disadvantages Because: Molding is not easy, the formed magnets are often not high in density and strength, and the permanent magnets formed by injection molding often have relatively low performance

Method used

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  • Preparation process of neodymium-iron-boron /ferrite composite magnet body for permanent magnet alternating current synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) After mixing NdFeB powder and ferrite powder evenly according to the mass ratio of 3:7, put it into the ethanol solution containing 5wt% silane coupling agent KH550, ultrasonically disperse for 30min, soak for 8h, and dry;

[0029] 2) Mix and granulate the ethanol solution containing 7wt% epoxy resin E51 and 2wt% curing agent maleic anhydride with the dried magnetic powder in step 1), and at the same time, the epoxy resin in the solution accounts for 2.5% of mass;

[0030] 3) Put the mixture obtained in step 2) in a vacuum intermediate frequency quick-setting induction furnace, evacuate to less than 0.8Pa, pass in argon gas, heat and melt, after refining, pour the melt on a copper roller to prepare Cast flakes (thickness 0.28-0.3mm), carry out hydrogenation alloy cast flakes in a hydrogen crushing furnace, and then make powder with a particle size of 3-4 μm through jet milling;

[0031] 4) Put the material powder in the mold, orient in a magnetic field with a magnet...

Embodiment 2

[0034] 1) After mixing NdFeB powder and ferrite powder evenly according to the mass ratio of 4:6, put it into the ethanol solution containing 7wt% silane coupling agent KH550, ultrasonically disperse for 30min, soak for 12h, and dry;

[0035] 2) Mix and granulate the ethanol solution containing 9wt% epoxy resin E44 and 3wt% curing agent m-phenylenediamine with the dried magnetic powder in step 1), and at the same time, the epoxy resin in the solution accounts for the mass of the magnetic powder 4.5% of

[0036] 3) Put the mixture obtained in step 2) in a vacuum intermediate frequency quick-setting induction furnace, evacuate to less than 1Pa, pass in argon gas, heat and melt, and after refining, pour the melt on a copper roller to prepare casting Slices (thickness 0.28-0.3mm), hydrogenated alloy cast in hydrogen crushing furnace, and then made into powder with a particle size of 3-4μm by jet mill;

[0037] 4) Put the material powder in the mold, orient in a magnetic field wit...

Embodiment 3

[0040] 1) After mixing NdFeB powder and ferrite powder evenly according to the mass ratio of 5:5, put it into the ethanol solution containing 6wt% silane coupling agent KH560, ultrasonically disperse for 60min, soak for 12h, and dry;

[0041] 2) Mix and granulate the ethanol solution containing 8wt% epoxy resin E51 and 2.5wt% curing agent maleic anhydride with the dried magnetic powder in step 1), and at the same time, the epoxy resin in the solution accounts for 4% of the mass of magnetic powder;

[0042] 3) Put the mixture obtained in step 2) in a vacuum intermediate frequency quick-setting induction furnace, evacuate to less than 1Pa, pass in argon gas, heat and melt, and after refining, pour the melt on a copper roller to prepare casting Slices (thickness 0.28-0.3mm), hydrogenated alloy cast in hydrogen crushing furnace, and then made into powder with a particle size of 3-4μm by jet mill;

[0043] 4) Put the material powder in the mold, orient in a magnetic field with a m...

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Abstract

The invention discloses a preparation process of a neodymium-iron-boron / ferrite composite magnet body for a permanent magnet alternating current synchronous motor, which comprises the steps that: (1) neodymium-iron-boron powder and ferrite powder are uniformly mixed, put into coupling agent solution, decentralized, soaked and dried; (2) binder and curing agent solution are blended and granulatedwith magnetic powder which is dried in step (1); (3) the mixture which is obtained in step (2) is melted, cast into sheets, broken in hydrogen and ground by air into material powder with the grain size of 3mu m to 4mu m; (4) the material powder is arranged in a mould, oriented, compressed, shaped and demagnetized, a raw blank is taken out, vacuumized and packaged, the packaged blank is put into an isostatic pressing machine to be pressurized to 18MPa to 25MPa, pressure is maintained and the blank is taken out; and (5) the raw blank which is shaped in step (4) is arranged in a high vacuum furnace to be sintered, and is aged in two stages. The preparation process manufactures the high-density and high-performance permanent magnet body for the permanent magnet alternating current synchronousmotor with lower cost.

Description

technical field [0001] The invention relates to a preparation process of an NdFeB / ferrite composite magnet for a permanent magnet AC synchronous motor. Background technique [0002] In the prior art, the methods for making magnets for permanent magnet AC synchronous motors generally include warm compression molding and injection molding. Both warm compression molding and injection molding are common powder metallurgy molding technologies. For warm compression molding, this method has inherent disadvantages Reason: Molding is not easy, the formed magnets are often not high in density and strength, and the permanent magnets formed by injection molding often have relatively low performance. Contents of the invention [0003] The purpose of the present invention is to provide a preparation process of NdFeB / ferrite composite magnets for permanent magnet AC synchronous motors. [0004] The technical scheme that the present invention takes is: [0005] A preparation process of ...

Claims

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Application Information

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IPC IPC(8): H02K15/03
Inventor 邓上云
Owner 邓上云
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