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Method for simultaneously improving magnetic property and mechanical property of hot-pressing magnet ring

A magnetic and mechanical technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of low bending strength of the hot-pressed radial ring, and achieve the effect of improving mechanical properties, easy deformation and good rheology

Inactive Publication Date: 2010-04-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem of low bending strength of the hot-pressed radial ring is still not solved

Method used

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  • Method for simultaneously improving magnetic property and mechanical property of hot-pressing magnet ring
  • Method for simultaneously improving magnetic property and mechanical property of hot-pressing magnet ring
  • Method for simultaneously improving magnetic property and mechanical property of hot-pressing magnet ring

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] At the same time, the method of improving the magnetic and mechanical properties of the hot-pressed magnetic ring includes using the NdFeB quick-setting sheet as a thin strip formed by rapid quenching of the master alloy, and then crushing the strip into a uniform quick-quenched powder by magnetic separation, and then performing hot pressing Molding, hot extrusion molding, using the feature that the easy magnetization direction is parallel to the pressure direction to realize the radial orientation of the magnetic ring, and prepare a hot-pressed magnetic ring with high density, nanocrystalline, and radial texture. Nano metal Cu powder with low melting point and good ductility is evenly added to the quenching powder to improve mechanical properties such as bending strength and magnetic properties.

[0027] The thin strip is 30 μm to 50 μ...

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Abstract

The invention discloses a method for simultaneously improving the magnetic property and mechanical property of a hot-pressing magnet ring, comprising the following steps: quickly quench a band by taking NdFeB strip-casting flake as a master alloy; then, breaking and magnetically separating the band into even quickly quenched powder; and performing hot-press shaping and hot extrusion shaping. The invention is characterized in that nanometer metal Cu powder is evenly added in quickly quenched powder before hot extrusion shaping. Compared with the prior art, the invention has the advantages that nanometer metal Cu powder with low melting point and favourable ductility is added to ensure that nanometer metal powder with the characteristic can be evenly distributed in an NdFeB crystal particle crystal boundary in a diffusing mode in the hot pressing process; the magnetic body texture is improved, and Vickers hardness of the crystal boundary phase compound is far larger than the Vickers hardness of the NdFeB magnetic body crystal boundary Nd-rich phase, thus reaching the purpose of improving the NdFeB mechanical property.

Description

technical field [0001] The invention relates to a processing method for a hot-pressed magnetic ring, in particular to a method for simultaneously improving the magnetic and mechanical properties of a hot-pressed magnetic ring. Background technique [0002] The radiation-oriented permanent magnet ring (also known as: hot-pressed magnetic ring) is formed with single or multiple N poles and S poles uniformly on the inner and outer sides of the ring. This radially magnetized permanent magnet ring is suitable for rotors and stators of micro-motors in various precision instruments and control systems, and is an important material and component of a new generation of hybrid motors. [0003] At present, the methods for producing high-density NdFeB radiation-oriented permanent magnet rings mainly include splicing or one-time molding sintering process, but due to the radial shrinkage problem in the sintering process, this method has not been widely used. For related documents, please ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/057H01F1/08H01F41/02C22C1/03B22F3/02
Inventor 易鹏鹏闫阿儒李东林旻
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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