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Method for manufacturing neodymium iron boron permanent magnetic material with high performance

A technology of permanent magnet materials and manufacturing methods, which is applied in the fields of magnetic materials, inductor/transformer/magnet manufacturing, and the magnetism of inorganic materials, and can solve problems such as the coercive force and magnetic energy product of NdFeB permanent magnet materials cannot meet actual needs, etc. Achieve the effect of increasing molecular anisotropy field, improving performance and improving coercive force

Inactive Publication Date: 2010-11-03
TIANHE ADVANCED TECH MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some fields, higher requirements are put forward for the coercive force and magnetic product energy of NdFeB permanent magnet materials. Therefore, the NdFeB permanent magnet materials produced according to the existing manufacturing methods of NdFeB permanent magnet materials The coercive force and magnetic energy product of magnetic materials cannot meet the actual needs more and more, so there is an urgent need for a manufacturing method that can improve the coercive force and magnetic energy product performance of NdFeB permanent magnet materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) The following atomic percentages of raw materials: Nd alloy: 12.8%; Dy: 0.7%; Co: 1.0%; Cu: 0.1%; Al: 0.4%; B: 5.95%, the rest is Fe and impurities introduced by raw materials mix together for ingredients;

[0018] (2) Put the prepared raw materials into the vacuum intermediate frequency quick-setting induction furnace, and evacuate to less than 1.0×10 -1 Under the condition of Pa, it is filled with Ar gas protection for heating and melting. After refining, the molten steel is poured onto the rotating cooling copper roller to prepare alloy cast sheets with a thickness of about 0.25-0.35mm. The pouring temperature is controlled at 1450-1500℃ In between, the hydrogenated alloy castings are carried out in the hydrogen crushing furnace. After the low-temperature hydrogen absorption and high-temperature dehydrogenation reactions, the alloy castings become very loose particles, and then the powder with an average particle size of 3.0-5.0 μm is made by jet milling ;

[0...

Embodiment 2

[0024] (1) The following atomic percentages of raw materials: Pr-Nd alloy containing 20% ​​Pr: 12.8%; Dy: 0.7%; Co: 1.0%; Al: 0.5%; B: 5.95%, the rest is Fe and introduced from raw materials The impurities are mixed together for batching;

[0025] (2) The following production steps and processes are the same as in Example 1, please refer to Example 1.

[0026] The coercive force and magnetic energy product comparison of the NdFeB permanent magnet materials made in the above-mentioned embodiment 1 and embodiment 2 are shown in the following table: (the test sample is a φ10×5 cylinder)

[0027] Example

[0028] From above two examples, use Pr-Nd alloy to replace metal Nd, the coercive force of magnet is slightly improved, because the price of Pr-Nd alloy is lower than the price of metal Nd, the cost of the magnet produced also reduces to some extent , have certain market competitiveness.

Embodiment 3

[0030] (1) The following atomic percentages of raw materials: Nd alloy: 11.6%; Dy: 1.9%; Tb: 0.5%; Co: 1.2%; Al: 0.5%; B: 5.95%, the rest is Fe and impurities introduced by raw materials mix together for ingredients;

[0031] (2) The following production steps and processes are the same as in Example 1, please refer to Example 1.

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Abstract

The invention discloses a method for manufacturing a neodymium iron boron permanent magnetic material with high performance. The method improves the coercive force of a magnet by adding a heavy rare earth element Tb instead of Dy into the raw material and reduces the production cost by substituting a small amount of Pr for Nd. The neodymium iron boron permanent magnetic material containing Pr and Tb consists of (Nd, Pr)xFebalanceByDyzTbuCovAlw, wherein the atom percent of each element in the invention is as follows: x is not less than 7% and not greater than 15%, y is not less than 5.5% and not greater than 8.0%, z is not less than 0.05% and not greater than 6%, u is not less than 0 and not greater than 2%, v is not less than 0 and not greater than 3% and w is not less than 0 and not greater than 1.5%; and the balance is Fe and impurities introduced by the raw material. The materials are mixed according to the atom percents, melted, made into powder, formed and sintered. Due to the addition of Tb, the anisotropy field of the magnet molecules is improved and the coercive force of the magnet is obviously improved. Moreover, as the magnetocrystalline anisotropy field of Pr2Fe14B is slightly higher than that of Nd2Fe14B, the coercive force of the magnet is improved a little by adding a small amount of Pr.

Description

technical field [0001] The invention relates to a method for manufacturing a permanent magnet material, in particular to a method for manufacturing a high-performance NdFeB permanent magnet material. Background technique [0002] At present, permanent magnet materials are widely used in many fields such as electronics, automobiles, computers, energy, machinery, medical equipment, etc., such as manufacturing various permanent magnet motors, vibration motors, permanent magnet instruments, electronics industry (magnetic rings on mobile phones, computers , magnetic column), automobile industry, petrochemical industry, nuclear magnetic resonance device, audio equipment (audio, earphone, loudspeaker, circular magnetic piece of magnetic vibrator), magnetic levitation system, permanent magnet crane, magnetic separator, magnetic transmission mechanism and magnetic medical equipment, etc. In some fields, higher requirements are put forward for the coercive force and magnetic product ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/16
CPCH01F41/0273H01F1/0573B22F3/101B22F9/023C22C33/0278H01F1/0577H01F1/0571B22F3/16
Inventor 袁文杰董义刁树林范耀林陈雅
Owner TIANHE ADVANCED TECH MAGNET
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