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Warm-press molded bonded magnet and preparation method thereof

A technology of bonded magnets and warm pressing molding, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., and can solve problems such as poor orientation

Active Publication Date: 2020-02-07
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a preparation method of warm-pressed bonded magnets, which improves the fluidity of the magnetic powder and the density of the magnet by improving the morphology and structure of the magnetic powder, and adds a composite heat-conducting agent during the powder mixing process. The coating ability is good, which can better solve the problems of poor orientation caused by slow heat transfer during the hot pressing process, and also has a certain effect on improving the fluidity of the powder.

Method used

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  • Warm-press molded bonded magnet and preparation method thereof
  • Warm-press molded bonded magnet and preparation method thereof
  • Warm-press molded bonded magnet and preparation method thereof

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preparation example Construction

[0048] The second aspect of the present invention provides a method for preparing a warm-pressed bonded magnet, such as figure 1 shown, including the following steps:

[0049] Step 1. Master alloy smelting: Proportion all raw materials according to the mass percentage of the above-mentioned anisotropic NdFeB magnetic powder, heat the prepared raw materials by medium frequency induction into molten metal by vacuum smelting method, and then pour them into double-sided water-cooled fixed molds , get an ingot. Specifically, the cast ingot is a plate-like rapidly quenched NdFeB alloy with a columnar crystal structure, and the thickness is 15-30 mm.

[0050] Step 2. Heat treatment: put the ingot into a vacuum heat treatment furnace, vacuumize and heat to 1100°C-1200°C, fill with argon gas to a certain pressure, keep the furnace at a constant temperature for a period of time, and then lower the temperature step by step and keep it for a period of time. Time, and finally air-cooled ...

Embodiment 1

[0073] (1) Ingredients: 50kg of raw materials are formulated according to the formula, and the surface of the iron rod is derusted and cleaned. Rare earth materials are required to be free from moisture, oil and rust.

[0074] (2) Ingot casting: the prepared raw material is heated by intermediate frequency induction into molten metal by vacuum smelting method, and then poured into a double-sided water-cooled fixed mold to finally obtain a plate-shaped fast-quenching Nd-Fe-B alloy with a columnar crystal structure, cast The proportion of ingot columnar crystals is between 70% and 90%, and the thickness is 15-30mm.

[0075] (3) Heat treatment: Put the ingot into a vacuum heat treatment furnace, vacuumize and heat to 1150°C, fill with argon to -0.08MPa, keep the furnace at a constant temperature for 20h, then start filling with argon to -0.04MPa, and cool down Operation, after 13 minutes, the temperature in the furnace is reduced to 900°C and kept at a constant temperature for 2 ...

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Abstract

The invention discloses a warm-press molded bonded magnet and a preparation method thereof. The warm-press molded bonded magnet comprises anisotropic neodymium iron boron magnetic powder, an adhesiveand a composite heat conduction agent. The preparation method comprises the steps of: master alloy smelting, heat treatment, HDDR treatment, glue mixing, powder mixing, pre-pressing forming, orientation forming, curing and the like. By adding a composite heat conduction agent, the heat conduction capability of a pre-pressed blank is enhanced to reach the Tf conversion temperature of added epoxy resin in an extremely short time, so that the powder is positioned in the uniform viscous epoxy resin, powder particles are conveniently arranged in order during orientation, the orientation is more complete, the effect is more remarkable, the density and the overall uniformity of the magnetic ring are improved during pressing, the conditions of layering, incomplete cementation and the like during orientation pressing are avoided, and the homogenization degree of the oriented magnetic ring is higher; and moreover, the composite heat conduction agent can replace traditional lubricants such as zinc stearate and magnesium stearate, so that the flowability of the magnetic powder is improved.

Description

technical field [0001] The invention relates to the technical field of bonded magnet materials, in particular to a warm-pressed bonded magnet and a preparation method thereof. Background technique [0002] Bonded NdFeB permanent magnet materials have many advantages such as strong magnetism, high degree of shape freedom, and good consistency. They are widely used in hard disk and optical disk drives, office automation, consumer electronics, household appliances, and automobiles. At present, the magnetic powder used for bonding NdFeB permanent magnet materials is mainly divided into two categories: isotropic and anisotropic. The isotropic NdFeB magnetic powder is prepared by the melt quenching method, and the maximum magnetic energy product is 12-18MGOe. The maximum magnetic energy product of the same-sex NdFeB bonded magnet thus prepared does not exceed 12MGOe, which is difficult to meet high-end needs. The anisotropic NdFeB magnetic powder is usually prepared by the HDDR m...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0578H01F41/0266
Inventor 罗阳廖一帆胡州于敦波杨远飞王子龙王仲凯谢佳君
Owner GRIREM ADVANCED MATERIALS CO LTD
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