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Composition for rare earth-like bonded permanent magnet, magnet prepared by the same and preparation method for the magnet

A technology of bonded magnets and compositions, which is applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of easy changes in size when heated, low dimensional stability of bonded magnets, etc., achieve dimensional stability, improve various performances, The effect of strength improvement

Active Publication Date: 2011-08-24
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dimensional stability of the above-mentioned bonded magnets is still low, and its size is easy to change when heated, and the reasonable use temperature is around 130 degrees Celsius

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Embodiment 1: 10kg epoxy resin is mixed with 0.1kg polyamide, pulverizes then, by organic solvent, controls the speed of dissolving, adds quick-quenching Nd-Fe-B powder 970kg, and the average particle size of powder is 1.0mm, The resin is uniformly wrapped on the magnetic powder by a kneader, the mixture is classified, and the good product is compressed into a Φ10×10mm standard cylinder (magnetic performance measurement), Φ22×Φ20×5mm standard magnetic ring (mechanical strength measurement) ), 120×15×10 standard block (determination of heat deflection temperature), and the performance results of the measurement after curing are shown in Table 1 above.

Embodiment 2

[0030] Embodiment 2: 50kg bisphenol A is mixed with 10kg polyamide, then pulverizes, by organic solvent, controls the speed of dissolving, adds quick-quenching Nd-Fe-B powder 900kg (resin is evenly wrapped by kneading machine On the magnetic powder, the mixture is classified, and the good products are compression-molded into Φ10×10mm standard cylinder (magnetic performance measurement), Φ22×Φ20×5mm standard magnetic ring (mechanical strength measurement), 120×15×10 standard block (thermal Deformation temperature measurement), after curing, measure its performance results as shown in the above table 1.

Embodiment 3

[0031] Example 3: After dissolving 1 kg of polyether ketone in an organic solvent, add 980 kg of quick-quenched Sm-Co powder. The average particle size of the powder is 1.5 mm. The resin is uniformly wrapped on the magnetic powder by a kneader, and then dissolved in an organic solvent 10kg epoxy resin, the epoxy resin is evenly wrapped on the magnetic powder wrapped with polyether ketone through the mixing machine, and the polyether ketone resin is evenly wrapped on the magnetic powder wrapped with polyether ketone and epoxy resin through the mixing machine On the magnetic powder, the mixture is graded, and the good products are compression-molded into Φ10×10mm standard cylinder (magnetic performance measurement), Φ22×Φ20×5mm standard magnetic ring (mechanical strength measurement), 120×15×10 standard block (thermal Deformation temperature measurement), after curing, measure its performance results as shown in the above table 1.

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PUM

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Abstract

The invention relates to a compound used for bonded magnets in the rare earth category, a magnet prepared with the compound, and a preparation method thereof, and belongs to the technology field of a magnetic material. The stability of the size of the magnet and the temperature tolerance of the product are improved through the combined use of a thermosetting resin and a thermoplastic resin, and the utilization of the difference of the melt indices of the thermosetting resin and the thermoplastic resin which are used as frames for each other at different temperatures. In addition, each magnetic characteristic of the magnet is unaffected.

Description

technical field [0001] The invention relates to a magnet prepared by pressing rare earth magnetic powder and a binder, a composition for the same and a preparation method of the magnet, belonging to the technical field of magnetic materials. Background technique [0002] Rare earth bonded magnets are mainly made of rare earth permanent magnet alloy (rare earth magnet) powder and binder (such as non-magnetic materials such as epoxy resin). The permanent magnetic properties of this type of magnet mainly depend on the magnetic properties of the rare earth magnet powder; the mechanical properties mainly depend on the binder. The main advantages of bonded magnets are excellent mechanical properties and the ability to easily fabricate small and complex parts with high precision. In recent years, rare earth bonded magnets have been widely used in spindle motors, stepping motors, etc. for electronic computer peripherals and other electromagnetic devices. [0003] Generally, bonded...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08L61/06C08L23/06C08L27/06C08L25/06C08L77/00C08L59/02C08L69/00C08L71/12C08L81/06C08L21/00C08K3/08H01F1/055H01F1/057H01F1/059
Inventor 吴峰何军义
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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