Preparation method for improving NdFeB (neodymium iron boron) coercivity by organic heavy rare earth complex

A neodymium-iron-boron and heavy rare earth technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, metal processing equipment, etc., can solve the problems of excessive heavy rare earth doping, grain growth, increased cost, etc. Simple, high coercivity, cost reduction effect

Active Publication Date: 2016-03-23
浙江凯文磁业有限公司
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Problems solved by technology

China's magnetic material manufacturers are also constantly developing heavy rare earth doping technology. Although the coercive force and service temperature of the products prepared by the existing process have been improved, the preparation process design is mainly in the alloy formula. Directly adding heavy rare earth alloys and single-element heavy rare earth nanoparticles, etc., or infiltrating terbium or dysprosium h

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  • Preparation method for improving NdFeB (neodymium iron boron) coercivity by organic heavy rare earth complex
  • Preparation method for improving NdFeB (neodymium iron boron) coercivity by organic heavy rare earth complex
  • Preparation method for improving NdFeB (neodymium iron boron) coercivity by organic heavy rare earth complex

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Embodiment 1

[0024] Preparation of brand 30EH NdFeB magnets by sintering method:

[0025] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting technology. The condensed sheet is broken into NdFeB alloy powder with an average particle size of 3.8 microns;

[0026] 2) Powder making: While further crushing the NdFeB alloy powder treated by the hydrogen crushing process to make powder, inject a mixture of acetone, isopentene and butadiene in a pouring manner, acetone, isopentene and butadiene The volume ratio of alkene is 6:1:4, and the mixture accounts for 0.1% of the total weight of NdFeB alloy powder;

[0027] 3) Mixing: inject the mixed liquid of organic heavy rare earth complex and ether into the NdFeB alloy powder by spraying, accounting for 0.1% of the total amount of NdFeB alloy powder. Among them, the organic heavy rare earth compound is a tricene heavy rare earth metal organic compound and a neodecanoic acid heavy rare earth, and their volum...

Embodiment 2

[0038] Preparation of brand 35EH NdFeB magnets by sintering method:

[0039] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting technology. The condensed sheet is broken into NdFeB alloy powder with an average particle size of 4.1 microns;

[0040] 2) Powder making: While further crushing the NdFeB alloy powder treated by the hydrogen crushing process to make powder, inject a mixture of acetone, isopentene and butadiene in a pouring manner, acetone, isopentene and butadiene The volume ratio of alkene is 6:13:1, and the mixture accounts for 0.5% of the total weight of NdFeB alloy powder;

[0041] 3) Mixing: inject the mixed liquid of organic heavy rare earth compound and ether into the NdFeB alloy powder by spraying, accounting for 1% of the total amount of NdFeB alloy powder. Among them, the organic heavy rare earth complexes are only three organic heavy rare earth metal organic compounds, accounting for 30% of the total weight of the...

Embodiment 3

[0052] Preparation of brand N48 NdFeB magnets by sintering method

[0053] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting technology. The condensed sheet is broken into NdFeB alloy powder with an average particle size of 4.3 microns;

[0054] 2) Powder making: While further crushing the NdFeB alloy powder treated by the hydrogen crushing process to make powder, inject a mixture of acetone, isopentene and butadiene in a pouring manner, acetone, isopentene and butadiene The volume ratio of alkene is 6:1:4, and the mixture accounts for 0.3% of the total weight of NdFeB alloy powder;

[0055] 3) Mixing: inject the mixed liquid of organic heavy rare earth complex and ether into the NdFeB powder by spraying, accounting for 0.5% of the total amount of NdFeB alloy powder. Among them, the organic heavy rare earth compound is only tricene heavy rare earth metal organic compound and neodecanoic acid heavy rare earth, and their volume ratio...

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Abstract

The invention discloses a preparation method for improving NdFeB (neodymium iron boron) coercivity by organic heavy rare earth complex. The preparation method comprises the following steps: preparing NdFeB alloy particles and smashing the NdFeB particles into powder, and injecting an antioxidant at the same time; injecting mixed liquid of the organic heavy rare earth complex and ethyl ether into the NdFeB alloy powder in a spraying manner; and pressing the mixed material into a blank magnet in a magnetic orientation manner, and sintering the blank magnet. According to the preparation method, the mixture of the rare earth complex and the ethyl ether is added in the spraying manner, so that the contact between the particles and oxygen can be effectively prevented, the oxygen content of the magnetic particles is reduced, and the distribution uniformity of the organic heavy rare earth complex among sintered magnet crystal boundaries is improved; the added organic heavy rare earth complex is degraded along with the rise of the sintering temperature, the residual heavy rare earth ions are uniformly distributed on the surfaces of the NdFeB magnetic particles, and the residual heavy rare earth ions are permeating to the NdFeB particles under a high temperature so as to improve the magnetocrystalline anisotropy and the coercivity of the magnetic main phase; and in addition, the preparation method is simple in process, easy to operate, and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a preparation method for enhancing the coercive force of sintered NdFeB by an organic heavy rare earth complex. Background technique [0002] Metal-based rare earth permanent magnet materials have been a very eye-catching research and development hotspot in the field of magnetism and magnetic material industry for forty years. The main types are neodymium iron boron, samarium cobalt and alnico and so on. At present, the most widely used metal-based rare earth permanent magnet material in the world is mainly NdFeB, which is widely used in high-tech fields such as voice coil motor VCM of computer drives, new motors, and nuclear magnetic resonance imaging MRL. With the rapid development of science and technology, in order to meet the needs of miniaturization, light weight, high performance and high reliability of components and equipment, th...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02B22F9/04B22F1/02B22F3/16B22F3/24
CPCH01F1/0572H01F1/0575H01F41/0293B22F3/16B22F3/24B22F9/04B22F2202/05B22F1/102B22F1/16
Inventor 卢阳春张朋越丁丽菁
Owner 浙江凯文磁业有限公司
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