Isostatic cool pressing method for preparing anisotropic bonded magnet with high degree of orientation

A cold isostatic pressing, anisotropic technology, used in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problem that the magnetic powder cannot be completely oriented freely, and achieve easy complex shape, high degree of orientation, and easy preparation. Effect

Active Publication Date: 2017-11-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for obtaining high-performance bonded magnets by cold isostatic pressing, which solves the difficulty that the magnetic powder cannot be completely oriented freely during the pressing process when preparing complex shapes, and at the same time improves the degree of magnet orientation, magnet density, magnetic properties, etc. excellent effect on

Method used

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  • Isostatic cool pressing method for preparing anisotropic bonded magnet with high degree of orientation
  • Isostatic cool pressing method for preparing anisotropic bonded magnet with high degree of orientation
  • Isostatic cool pressing method for preparing anisotropic bonded magnet with high degree of orientation

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Experimental materials: commercially available anisotropic strontium ferrite magnetic powder of 0.9-1um, bisphenol A epoxy resin, dicyandiamide curing agent, acetone, and a silicone mold with a wall thickness of about 2mm.

[0023] Step 1: Mix 20g of bisphenol A type epoxy resin, 3g of dicyandiamide curing agent and 8g of acetone, fully stir and mix evenly to prepare the binder premix;

[0024] Step 2: Add 100g of magnetic powder into the premixed solution, stir and mix evenly, inject the prepared slurry into a soft silicone mold, and the viscosity of the magnetic slurry is lower than 3000cps;

[0025] Step 3: Heat the slurry at 50°C to volatilize the solvent, and align it in a 1.5T magnetic field for 1 min, heat it in vacuum at low temperature to remove acetone, and then vacuum-pack the prepared intermediate;

[0026] Step 4: The silicone mold containing the magnet is subjected to cold isostatic pressing, the cold isostatic pressing pressure is 200 MPa, and the holding...

Embodiment 2

[0033] Experimental materials: Tianjin McQueen magnetic MQA magnetic powder, bisphenol A epoxy resin, maleic anhydride curing agent, acetone, silicone mold with a wall thickness of about 3mm.

[0034] Step 1: Dissolve 20g of bisphenol A type epoxy resin and 6g of maleic anhydride curing agent in 12g of acetone, fully stir and mix evenly to prepare the binder premix;

[0035] Step 2: Add 200g of MQA magnetic powder into the premix solution, stir evenly under vacuum, inject the prepared slurry into a soft silicone mold, and the viscosity of the magnetic slurry is lower than 3000cps;

[0036] Step 3: Heat the slurry at 60°C to volatilize the solvent, orient the mold along the Z-axis of the mold in a 1.8T magnetic field for 5 minutes, heat slowly in vacuum at low temperature to remove the solvent, and then vacuum-pack the obtained intermediate.

[0037] Step 4: Perform cold isostatic pressing on the silicone mold containing the magnet, the pressure is 400MPa, and the holding time ...

Embodiment 3

[0044] Experimental materials: 0.9-1um commercially available anisotropic strontium ferrite magnetic powder, Tianjin McQueen Magnetic MQA magnetic powder, bisphenol A epoxy resin, dicyandiamide curing agent, acetone, silicone mold with a wall thickness of about 5mm.

[0045] Step 1: Mix 20g of bisphenol A epoxy resin and 2g of dicyandiamide curing agent with 30g of acetone, fully stir and mix evenly, and prepare the binder premix;

[0046] Step 2: Mix 8wt% strontium ferrite magnetic powder and 92wt% mass MQA magnetic powder evenly, then add the mixed magnetic powder into the premix, stir well and homogenize, inject the prepared slurry into a soft silicone mold, and the viscosity of the magnetic slurry less than 3000cps;

[0047] Step 3: Heat the slurry at 40°C to volatilize the solvent, orient the slurry in a 2T magnetic field for 10 minutes, heat in vacuum at low temperature to remove acetone, and then vacuum-pack the prepared intermediate;

[0048] Step 4: The silicone mold...

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Abstract

The invention discloses an isostatic cool pressing method for preparing an anisotropic bonded magnet with high degree of orientation, and belongs to the technical field of rear-earth magnetic materials. The method comprises the following steps: dissolving a certain amount of thermosetting resin and a certain amount of curing agent into an organic solvent to prepare a bonding machine, then adding anisotropic bonded magnetic powder into a bonder solution, sufficiently stirring to prepare a uniform suspended state low viscosity magnetic slurry, injecting the uniform suspended state low viscosity magnetic slurry into a silicon rubber mold, carrying out vacuum sealing, carrying out orientation under a magnetic field of 1.5 to 2 T, carrying out isostatic cool pressing molding on the magnet after orientation, then curing the formed magnet to obtain high-performance bonded neodymium iron boron magnet. By using in situ orientation of the silicon rubber mold and the bonded magnet, the bonder solution can serve as a lubricating agent among the magnetic powder, complete orientation of the magnetic powder during orientation is guaranteed, and due to the fact that isostatic cool pressing pressure is isotropous after orientation, the degree of orientation of the magnetic powder which has been orientated cannot be damaged. A complicated silicon rubber mold is prepared through mold reversing, so that the bonded magnet with complicated shape is prepared. The mold is simple and easy to prepare, the magnet is high in degree of orientation, and the performance is higher than that of a bonded magnet prepared through ordinary pressing and injection molding.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials and provides a method for obtaining bonded magnets with high magnetic performance and high orientation degree by cold isostatic pressing. Background technique [0002] The development of bonded permanent magnets has been widely used in the fields of functional materials such as the automotive industry, information industry, control and measurement systems, and office automation industries. It is one of the most demanded and widely used materials in the field of high-tech magnetic functional materials. Bonded permanent magnet materials can be designed for magnetic properties and shapes according to needs, and the dimensional accuracy is very high, the degree of freedom of shape is easy to control, the mechanical properties and magnetic properties of the magnets are uniform, and the mechanical properties are excellent, which can realize large-scale automatic production and is econo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F41/0266H01F41/0273
Inventor 隋延力叶四扬郭志猛张欣悦杨芳徐欢
Owner UNIV OF SCI & TECH BEIJING
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