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Surface modification method capable of improving surface lubricating property of anisotropic permanent magnet powder particles

A permanent magnet powder, anisotropic technology, applied in the manufacture of permanent magnets, magnetic materials, magnetic objects, etc., can solve problems such as increasing process costs, and achieve the effect of simplifying the production process, solving the problem of magnetic powder sticking to the wall, and having good magnetic properties.

Inactive Publication Date: 2016-07-20
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to multi-step molding, additional process costs are increased

Method used

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  • Surface modification method capable of improving surface lubricating property of anisotropic permanent magnet powder particles
  • Surface modification method capable of improving surface lubricating property of anisotropic permanent magnet powder particles

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Experimental program
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Effect test

Embodiment

[0028] The permanent magnetic powder is HDDR anisotropic NdFeB magnetic powder and the powder particle size is less than 80 mesh, the thickness of the parylene film is ~3um, ~6um, the content of epoxy resin binder is 2.5% (mass fraction), and the content of silane coupling agent 0.5% (mass fraction).

[0029] The permanent magnet powder coated with parylene film is oriented at room temperature, and the process conditions are: the orientation magnetic field is 1.8T, and the pressing pressure is 600MPa.

[0030] The permanent magnet powder not coated with parylene film is formed by warm-press orientation. The process conditions are as follows: pressing temperature is 140°C, holding time is 1min, orientation magnetic field is 1.8T, and pressing pressure is 600MPa.

[0031] The performance comparison is shown in Table 1. Using the same HDDRNdFeB permanent magnet powder as raw material, using the same orientation magnetic field and pressing pressure, when the thickness of the pary...

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Abstract

The invention discloses a surface modification method capable of improving the surface lubricating property of anisotropic permanent magnet powder particles, belonging to the technical field of preparation of magnetic materials. A chemical vapor deposition polymerization (CVDP) method is adopted, and parylene is deposited and polymerized on the surface of pre-treated anisotropic permanent magnet powder; and the thickness of a parylene thin film is 1-50 microns. The surface lubricating property of the anisotropic permanent magnet powder modified by the parylene is greatly improved, and the density, orientation degree and magnetic property of a room-temperature orientated and molded magnet body are greater than the density, orientation degree and magnetic property of a magnet body molded by unmodified permanent magnet powder through warm pressing, so that when an anisotropic bonding permanent magnet is prepared by adopting mold pressing molding, the surface modification treatment is carried out on the permanent magnet powder particles through the parylene, and a room-temperature orientation and molding process can be used for replacing warm-pressing orientation and molding.

Description

technical field [0001] The invention belongs to a method for preparing an anisotropic molded bonded permanent magnet, in particular to a technology for preparing an anisotropic bonded permanent magnet with high orientation, high density and high magnetic performance at room temperature. Background technique [0002] Anisotropic bonded magnets have both good processing performance and more excellent magnetic properties, which can effectively promote the miniaturization, high efficiency, energy saving and light weight of electronic products, and become the development direction of bonded permanent magnets . [0003] The molding methods of bonded permanent magnets include compression molding, calendering molding, injection molding and extrusion molding, among which compression molding magnets are the most widely used due to their highest magnetic properties. [0004] At present, in industrialized production, the warm compression molding process is widely used in the preparatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F1/00
CPCH01F1/0572H01F1/0576H01F41/026H01F41/0273B22F1/103B22F1/102B22F1/10
Inventor 孙爱芝马斌许琛郎惠珍
Owner UNIV OF SCI & TECH BEIJING
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