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Preparation method of rare-earth bonding magnet

A technology of bonded magnets and rare earth magnetic powders, applied in the manufacture of inductors/transformers/magnets, adhesives, electrical components, etc. The effect of fluidity and magnetic powder loading, improving the oxidation resistance of magnetic powder and reducing the viscosity of the system

Inactive Publication Date: 2006-07-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This requires that the processing temperature must be above 220°C, and as we all know, rare earth permanent magnet materials are generally easy to oxidize, especially when the temperature is above 150°C, the oxidation is more serious, thereby greatly reducing the magnetic properties of the magnet and failing to exert the rare earth permanent magnet. Advantage
On the other hand, in order to pursue high magnetic performance, it is necessary to require a high loading of magnetic powder, which will undoubtedly reduce the fluidity of the system and bring difficulties to injection

Method used

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  • Preparation method of rare-earth bonding magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Sieve the raw magnetic powder of anisotropic NdFeB magnet produced by hydrogen explosion method, the result is +75μm:-75μm=1:1. Re-optimize the batch combination according to the ratio of +75μm:-75μm=7:3, and then put 2.5g / mL into the acetone phosphate solution with a concentration of 0.1mol / L and stir it in a stirring ball mill at a speed of 20 rpm After 30 minutes, filter and dry in vacuum at 110°C. It is 67VOL% and binder to mix 40min with temperature 235 ℃, rotating speed 30rpm in the kneader with loading subsequently, to obtain uniform feeding, and measure it with capillary rheometer at 300 ℃ temperature and 10 5 the s -1 Viscosity value η at shear rate. Wherein the composition of the adhesive is as follows: the matrix component is nylon 12 (melting point is 178° C., solubility parameter is 19.6), and the amount accounts for 78.6 wt% of the total adhesive; the coupling agent is KH550 silane, and the amount is 3 wt%. Lubricant is " 50wt% stearylamide (solubility ...

Embodiment 2

[0021] Sieve the raw magnetic powder of anisotropic NdFeB magnet produced by hydrogen explosion method, the result is +75μm:-75μm=1:1. Re-optimize the batch combination according to the ratio of +75μm:-75μm=8:2, and then put 3.5g / mL into the acetone phosphate solution with a concentration of 0.1mol / L and stir it in a stirring ball mill at a speed of 25 rpm After 60 minutes, filter and dry in vacuum at 90°C. It is 72VOL% and binder to mix 60min with temperature 235 ℃, rotating speed 40rpm in the kneader with loading subsequently, to obtain uniform feeding, and measure it with capillary rheometer at 300 ℃ temperature and 10 5 the s -1 Viscosity value η at shear rate. The composition of the binder is as follows: the base component is nylon 12, and the amount accounts for 73.9wt% of the total binder; the coupling agent is NDZ-201 titanate, and the amount is 4wt%; the lubricant is "70wt% Stearamide + 30wt% methyl silicone oil" compound, the dosage is 12wt%; the plasticizer is o-...

Embodiment 3

[0024] Sieve the raw magnetic powder of anisotropic NdFeB magnet produced by hydrogen explosion method, the result is +75μm:-75μm=1:1. Re-optimize the batch combination according to the ratio of +75μm:-75μm=7:2, and then put 2.5g / mL into the acetone phosphate solution with a concentration of 0.1mol / L and stir it in a stirring ball mill at a speed of 25 rpm 50min, filtered and dried in vacuum at 80°C. Then be that 65VOL% and binder mix 40min with temperature 215 ℃, rotating speed 30rpm in the kneader with loading capacity, to obtain uniform feeding, and measure its temperature at 300 ℃ and 10 with capillary rheometer 5 the s -1Viscosity value η at shear rate. The composition of the binder is as follows: the matrix component is nylon 12, and the dosage accounts for 81.5wt% of the total binder; the grade of the coupling agent is titanate, and the dosage is 3wt%; the lubricant is "60wt% stearic acid Zinc + 40wt% methyl silicone oil" compound, the dosage is 8wt%; the plasticizer...

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Abstract

This invention provides one rare earth binding magnet process method, which comprises the following steps: optimizing the magnetic powder distribution; matching the magnetic powder as proportion of 6 to 4 or 8 to 2; adopting non-water binderies process to process the anti-oxidation on the powder surface; mixing the rare powder as 55í½74VOLúÑ with binding agent to process injection materials; Injecting to shape to get the needed final product.

Description

technical field [0001] The invention belongs to the technical field of injection molding, and in particular provides a preparation method of a rare earth bonded magnet, which is suitable for injection molding. Background technique [0002] Rare earth permanent magnet materials have attracted more and more attention from the world because of their high magnetic properties and high cost performance, and their demand is increasing at a rate of 15% per year. There are two main preparation methods, namely sintering method and bonding method, and the bonding method includes molding method, calendering method, extrusion method and injection method. The injection molding method has the following characteristics: 1) It can easily make magnets of various complex shapes according to the needs of use, such as long strips, sheets, tubes, especially tiles and thin-walled rings; It is convenient to achieve radial anisotropy, and it is integrated with other components to form; 3) The proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02C09J177/00C09J123/06C09J123/12
Inventor 曲选辉段柏华许小静
Owner UNIV OF SCI & TECH BEIJING
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