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High performance NdFeB rare earth permanent magnet material and preparation method thereof

A rare earth permanent magnet, neodymium iron boron technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of easy sliding or rotation of magnetic powder, difficult control of magnet oxidation, and high requirements for hot pressing molds. The effect of micro-porosity, short sintering time and comprehensive magnetic properties improvement

Active Publication Date: 2019-04-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the pre-sintering is carried out in a vacuum sintering furnace and the holding time is long, the hot-press sintering uses a vacuum hot-press furnace, so the operation is more cumbersome, the cost increases, and the oxidation of the magnet is not easy to control; The pressure exerted by the orientation direction (axial direction) of the pre-sintered magnet blank is very large, so the magnetic powder is prone to slip or rotate, resulting in deformation and damage to the orientation of the magnetic powder. At the same time, the requirements for the hot pressing mold are also high.

Method used

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  • High performance NdFeB rare earth permanent magnet material and preparation method thereof
  • High performance NdFeB rare earth permanent magnet material and preparation method thereof
  • High performance NdFeB rare earth permanent magnet material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] This embodiment prepares 27.17Nd-70.59Fe-1.02B-0.72Al-0.5Cu rare earth permanent magnet material, and the process steps are as follows:

[0034] (1) Ingredients

[0035] Dosing according to the chemical formula of the above-mentioned rare earth permanent magnet materials, and remove the oxides and inclusions on the surface of the metal raw materials;

[0036] (2) Casting

[0037] Put the raw materials prepared in step (1) into a vacuum induction melting furnace and melt them under the condition of high-purity argon. After melting, pour the alloy liquid on a water-cooled copper roller with a linear speed of 3m / s, and then quickly cool it to obtain Quick-setting alloy cast sheet with an average thickness of 0.25mm;

[0038] (3) Preparation of magnetic powder

[0039] Put the alloy cast sheet obtained in step (2) into a rotary hydrogen explosion furnace for hydrogen absorption-dehydrogenation treatment to obtain coarsely crushed alloy particles with a particle size of 1...

Embodiment 2

[0054] This embodiment prepares 29.28Nd-68.15Fe-1.02B-0.85Al-0.7Cu rare earth permanent magnet material, and the process steps are as follows:

[0055] (1) Ingredients

[0056] Dosing according to the chemical formula of the above-mentioned rare earth permanent magnet materials, and remove the oxides and inclusions on the surface of the metal raw materials;

[0057] (2) Casting

[0058] Put the raw materials prepared in step (1) into a vacuum induction melting furnace and melt them under the condition of high-purity argon. After melting, pour the alloy liquid on a water-cooled copper roller with a linear speed of 3m / s, and then quickly cool it to obtain Quick-setting alloy cast sheet with an average thickness of 0.25mm;

[0059] (3) Preparation of magnetic powder

[0060] Put the alloy cast sheet obtained in step (2) into a rotary hydrogen explosion furnace for hydrogen absorption-dehydrogenation treatment to obtain coarsely crushed alloy particles with a particle size of 1...

Embodiment 3

[0074] This example prepares 29.82(Nd,Pr)-62.42Fe-4.97Co-1.0B-0.83Ga-0.96Cu rare earth permanent magnet material, and the process steps are as follows:

[0075] (1) Ingredients

[0076] Dosing according to the chemical formula of the above-mentioned rare earth permanent magnet materials, and remove the oxides and inclusions on the surface of the metal raw materials;

[0077] (2) Melting and casting: put the raw materials prepared in step (1) into a vacuum induction melting furnace, melt under the condition of high-purity argon, and pour the alloy liquid on a water-cooled copper roller with a linear speed of 3m / s after melting, that is Quick-setting alloy cast sheets with an average thickness of 0.25mm can be obtained after rapid cooling;

[0078] (3) Preparation of magnetic powder

[0079] Put the alloy cast sheet obtained in step (2) into a rotary hydrogen explosion furnace for hydrogen absorption-dehydrogenation treatment to obtain coarsely crushed alloy particles with a p...

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Abstract

A preparation method of a high-performance NdFeB rare earth permanent magnet material: (1) batching; (2) melting and casting; (3) preparing magnetic powder; (4) preparing a magnetic field forming green body; (5) cold isostatic pressing; (6) ) low-pressure sintering, put the cold isostatic pressing green body obtained in step (5) into a low-pressure sintering furnace, and when the vacuum is evacuated to the furnace pressure≤1×10 ‑2 Start to heat up at Pa, when the temperature rises to 900-1000°C and keep it warm for 0.5-1.0h, keep vacuuming during the above-mentioned heating and heat preservation process, stop vacuuming after the heat preservation is over, continue to maintain the temperature in the furnace at 900-1000°C and feed High-purity inert gas until the pressure in the furnace is 0.5-4MPa and heat-preservation and pressure-holding sintering for 5-30 minutes. After sintering, stop heat preservation and pass high-purity inert gas at room temperature to cool to room temperature to obtain a sintered magnet; (7) Two-stage heat treatment. The above method can obtain the NdFeB rare earth permanent magnet material with excellent comprehensive magnetic properties and reduce the cost.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a method for preparing rare earth permanent magnet materials. Background technique [0002] In recent years, sintered NdFeB magnets have been widely used in low-carbon economic fields such as wind power generation, hybrid electric vehicles / pure electric vehicles, and energy-saving home appliances. According to the needs of applications, double high magnetic performance magnets (high energy product (BH ) max and high intrinsic coercive force H cj ) and reducing production costs have become the main goals of development. Therefore, how to obtain high comprehensive magnetic properties of magnets at the lowest cost has become an urgent problem to be solved. The main factors affecting the comprehensive magnetic properties of sintered NdFeB magnets are magnet density, grain size, and intergranular phase distribution. [0003] In order to in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08C22C38/00C22C38/12C22C38/10C22C38/16C22C38/06B22F9/04B22F1/00B22F3/04B22F3/16C21D1/773C21D9/00
CPCH01F1/0571H01F1/0576H01F1/0577C21D1/773C21D9/0068C22C38/005C22C38/06C22C38/10C22C38/12C22C38/16B22F3/04B22F3/16B22F9/04B22F1/10
Inventor 李军刘颖赵伟向前汤丹黄建昕
Owner SICHUAN UNIV
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