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Method for preparing high-performance NdFeB magnets through holmium ferrite and gallium eutectic adulteration

A NdFeB, high-performance technology, applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high price of dysprosium and terbium, limit the production of high magnetic energy product products, increase the cost of raw materials, etc., and achieve reduction Effects of production cost, improvement of remanence, and reduction of sintering temperature

Inactive Publication Date: 2016-07-13
SINOSTEEL ANHUI TIANYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, 48H and above products are prepared by adding part of dysprosium and terbium elements to replace praseodymium and neodymium alloys during the smelting process. On the one hand, due to the high price of dysprosium and terbium, the cost of raw materials is increased; Production of high energy product products

Method used

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  • Method for preparing high-performance NdFeB magnets through holmium ferrite and gallium eutectic adulteration
  • Method for preparing high-performance NdFeB magnets through holmium ferrite and gallium eutectic adulteration

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Embodiment 1

[0025] A method for preparing a high-performance NdFeB magnet by holmium-iron-gallium eutectic doping of the present invention comprises the following specific steps:

[0026] (1) Preparation of holmium iron gallium hydride powder

[0027] a. Melting holmium-iron alloy with a mass ratio of 80% and metal gallium in a vacuum melting furnace according to a weight ratio of 9:1 to make holmium-iron-gallium alloy ingots, the alloy composition of which is Ho 72 Fe 18 Ga 10 (weight ratio);

[0028] b. Place the holmium-iron-gallium alloy ingot obtained above in a hydrogen furnace, control the hydrogen pressure at 0.1 MPa, and the temperature at 500°C, fully absorb hydrogen until the hydrogen pressure remains constant, and obtain primary holmium-iron-gallium with a particle size of 120 μm Hydride powder;

[0029] c. Ball milling: the primary holmium iron gallium hydride powder is jet milled and ball milled in a protective nitrogen atmosphere to make holmium iron gallium hydride pow...

Embodiment 2

[0036] A method for preparing a high-performance NdFeB magnet by holmium-iron-gallium eutectic doping of the present invention comprises the following specific steps:

[0037] (1) Preparation of holmium iron gallium hydride powder

[0038] a. Melting holmium-iron alloy with holmium mass ratio of 80% and metal gallium in a vacuum melting furnace according to the weight ratio of 9:1 to make holmium-iron-gallium alloy ingot, the alloy composition is Ho 72 Fe 18 Ga 10 (weight ratio);

[0039] b. Place the holmium-iron-gallium alloy ingot obtained above in a hydrogen furnace, control the hydrogen pressure at 0.12 MPa, and the temperature at 550°C, fully absorb hydrogen until the hydrogen pressure remains constant, and obtain primary holmium-iron-gallium with a particle size of 110 μm Hydride powder;

[0040] c. Ball milling: the primary holmium iron gallium hydride powder is jet milled and ball milled in a protective nitrogen atmosphere to make holmium iron gallium hydride powd...

Embodiment 3

[0047] A method for preparing a high-performance NdFeB magnet by holmium-iron-gallium eutectic doping of the present invention comprises the following specific steps:

[0048] (1) Preparation of holmium iron gallium hydride powder

[0049] a. Melting holmium-iron alloy with a mass ratio of 80% and metal gallium in a vacuum melting furnace according to a weight ratio of 9:1 to make holmium-iron-gallium alloy ingots, the alloy composition of which is Ho 72 Fe 18 Ga 10 (weight ratio);

[0050] b. Place the holmium-iron-gallium alloy ingot obtained above in a hydrogen furnace, control the hydrogen pressure at 0.1 MPa, and the temperature at 450°C, fully absorb hydrogen until the hydrogen pressure remains constant, and obtain primary holmium-iron-gallium with a particle size of 110 μm Hydride powder;

[0051] c. Ball milling: the primary holmium iron gallium hydride powder is jet milled and ball milled in a protective nitrogen atmosphere to make holmium iron gallium hydride powde...

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Abstract

The invention discloses a method for preparing high-performance NdFeB magnets through holmium ferrite and gallium eutectic adulteration.According to the method, NdFeB alloy ingots or cast pieces serve as main alloy powder, holmium ferrite and gallium hydride serves as auxiliary alloy powder, and by means of uniform mixing, orientation forming, isostatic cool pressing and sintering, the high-performance NdFeB magnets are obtained.Low-price holmium and ferrite alloy sold in the market and gallium are alloyed, the alloy reacts with hydrogen easily, and therefore holmium ferrite and gallium hydride powder is formed through expansion; compared with magnets without the holmium ferrite and gallium hydride powder, the high-performance NdFeB magnets have the advantages that as the holmium ferrite and gallium eutectic melting point is low, flowing of the rare earth-rich phase is helped, the sintering temperature is reduced, and the coercivity and remanence of the magnets are improved; part of holmium enters a main phase boundary, part of holmium is combined with oxygen to be attached to the crystal boundary, and the coercivity of the magnets is improved.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to a preparation method of an NdFeB magnet. Background technique [0002] The application fields and volume of NdFeB magnets are increasing day by day, and the annual market demand is increasing by nearly 20%. Therefore, the prices of praseodymium neodymium alloys, dysprosium iron alloys, and terbium are getting higher and higher, and the supply is very tight. At present, 48H and above products are prepared by adding part of dysprosium and terbium elements to replace praseodymium and neodymium alloys in the smelting process. On the one hand, due to the high price of dysprosium and terbium, the cost of raw materials is increased; Production of high energy product products. [0003] In the book "Sintered NdFeB Rare Earth Permanent Magnet Materials and Technology", Zhou Shouzeng and others studied the role of dysprosium and terbium in place of praseod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057C22C28/00B22F9/04B22F3/16
CPCH01F41/0293B22F3/16B22F9/04B22F2009/043B22F2999/00C22C28/00H01F1/0571H01F41/0266B22F3/02B22F2202/05
Inventor 周军孙红军宋伟
Owner SINOSTEEL ANHUI TIANYUAN TECH