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Bonding type Sm-Fe-N, Nd-Fe-N compound permanent-magnet material and preparing method thereof

A composite permanent magnet material, neodymium iron nitrogen technology, applied in the direction of magnetic materials, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., can solve the problem of weak resistance to external magnetic field interference, low coercive force of permanent magnet powder, Problems such as the high price of magnets, to achieve good anti-interference ability of external magnetic field, anti-oxidation ability and corrosion resistance ability, and the effect of reducing additional costs

Inactive Publication Date: 2009-02-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently using NdFe 12 N x prepared bonded magnets, and from NdFe 12 N x Composite bonded magnets prepared by compounding with ferrite have greatly improved in terms of oxidation resistance, corrosion resistance and price, but due to NdFe 12 N x The coercive force of permanent magnet powder is low (about 400kA / m), and its ability to resist external magnetic field interference in the preparation of bonded magnets and their composite magnets is not strong, thus limiting its application
[0004] In 1990, Coey et al found that Sm 2 Fe 17 N x Type compounds have excellent permanent magnetic properties, with and NdFe 12 N x Type rare earth permanent magnet powder has similar characteristics, and NdFe 12 N x Type permanent magnet powder has higher intrinsic coercive force than it (isotropic Sm prepared by HDDR method 2 Fe 17 N x The coercive force of magnetic powder can reach 1600kA / m), but the bonded Sm 2 Fe 17 N x Magnets generally have the problem of high prices, so their applications are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The formula of mixed magnetic powder in the present embodiment is the anisotropic NdFe of 50% by weight percentage 12 N x (x≤3) magnetic powder and 50% anisotropic Sm 2 Fe 17 N x (x≤3) magnetic powder; the binder is epoxy resin with a content of 1.3% (percentage by weight), and the content of the mixed magnetic powder is 98.5% (percentage by weight); the mixed magnetic powder is coated with titanate, and then added to the ring Oxygen resin binder and zinc stearate are mixed evenly, and after orientation, they are pressed and formed on a press, the forming pressure is selected as 7T, and the formed bodies are all standard samples of ф10×10mm. The density of the composite permanent magnet material is 6.07g / cm 3 , the magnetic properties are remanence Br=0.73T, magnetic induction coercive force H cb =389kA / m, intrinsic coercive force H cj =741kA / m, maximum energy product (BH) m =86kJ / m 3 .

Embodiment 2

[0019] In this embodiment, anisotropic NdFe with a weight percentage of 90% is used 12 N x (x≤3) magnetic powder and 10% anisotropic Sm 2 Fe 17 N x (x≤3) The mixed magnetic powder of magnetic powder is put into a Z-type kneader and mixed. After the silane with a weight ratio of 0.3% is diluted with acetone, it is added in the form of spraying, and finally 9% by weight of nylon 6 and 0.2% of anti-aging are added. Agent RD, mixed evenly, the content of the mixed magnetic powder is 90.5% (percentage by weight). After the mixture is granulated by twin-screw extrusion, the magnet is finally injection-molded under the conditions of 250°C and 120Mpa. The magnetic properties of the composite permanent magnet are remanence Br=0.62T, magnetic induction coercive force H cb =310kA / m, intrinsic coercive force H cj =583kA / m, maximum energy product (BH)m=62kJ / m 3 .

Embodiment 3

[0021] The formula of the mixed magnetic powder in this embodiment is 90% isotropic Sm 2 Fe 17 N x (x≤3) magnetic powder and 10% isotropic NdFe 12 N x (x≤3) magnetic powder; the binder is made of phenolic resin with a content of 1.5% (percentage by weight), and the content of the mixed magnetic powder is 98.4% (percentage by weight); the mixed magnetic powder is coated with titanate, and then added with phenolic resin The binder and the zinc stearate are mixed evenly, pressed and formed on a press, the forming pressure is selected as 10T, and the formed bodies are all standard samples of ф10×10mm. The density of the composite permanent magnet material is 6.10g / cm 3 , the magnetic properties are remanence Br=0.65T, magnetic induction coercive force H cb =410kA / m, intrinsic coercive force H cj =1109kA / m, maximum energy product (BH) m =66kJ / m 3 .

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Abstract

The invention relates to an adhesive iron nitrogen permanent magnetic powder, and neophane iron nitrogen permanent magnetic powder composite material. Wherein, it is formed by samarium nitrogen permanent magnetic powder, neophane iron nitrogen permanent magnetic mixed powder at 83-98.9%, macromolecule adhesive at 1-15%, and agent at 0.1-2%; the mixed magnetic powder comprises samarium iron nitrogen permanent magnetic powder at 2-98%. And the production comprises that molding, shaping, ejecting, extruding and extending. The invention has high-temperature resistance, corrosion resistance and low cost.

Description

technical field [0001] The invention belongs to bonded permanent magnet materials, in particular to bonded permanent magnet materials formed by compounding two kinds of permanent magnet alloy powders. Background technique [0002] Bonded magnets have been widely used in the fields of automobiles, electronic computers, information and office automation systems, household appliances, audio-visual systems, and magnetic therapy health products since their inception. With the rapid development of industry, high-performance bonded permanent magnets The demand for materials is increasing, with a rapid growth rate of 30% per year. The existing bonded magnets generally use NdFeB magnetic powder. As we all know, for my country, the output of sintered NdFeB has ranked first in the world, but bonded NdFeB is a weak point. The magnetic powder is limited by patents and can only rely on imports, which leads to a correspondingly high price of NdFeB series composite magnets. In addition, f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053H01F1/08H01F41/02B22F3/00
Inventor 刘颖叶金文朱国丽涂铭旌
Owner SICHUAN UNIV