A kind of preparation method of NdFeB magnetic material

A magnetic material, neodymium iron boron technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of magnet surface damage, poor impact resistance, poor corrosion resistance of magnets, etc., to improve quality and production efficiency, operation Simple process and good corrosion resistance

Active Publication Date: 2017-08-18
包头恒宇磁源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention: the traditional NdFeB magnetic material has poor corrosion resistance and must be treated by coating, while the commonly used epoxy resin coating will not only cause damage to the surface of the magnet, but also has high brittleness, poor impact resistance, The current situation of being easy to scratch provides a method of mixing ferric oxide, neodymium sesquioxide and aluminum tetroxide, adding aluminum powder, burning with magnesium strips to generate reactants, and then passing the generated reactants through preliminary separation, The preparation method of removing light substances such as magnesium oxide and aluminum oxide generated, advanced oxidation treatment, adding sodium borohydride solution for high temperature reduction, and calcining to obtain NdFeB magnetic materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] First, in parts by weight, get 30 parts of ferric oxide, 30 parts of neodymium trioxide and 15 parts of aluminum tetroxide, mix them in a high-speed ball mill, add stainless steel grinding balls with a particle diameter of 1 mm, and grind them at 300 r / m. Treat for 5 minutes at 1 min, further grind the mixture into powder, pass through a 300-mesh sieve, and put it into the reaction kettle, then add aluminum powder with a mixed powder mass of 15% to the reaction kettle, mix evenly, seal the reaction kettle, and keep the temperature at 30°C Curing for 1 hour, when the curing is over, open the reaction kettle, take the magnesium bar and ignite it and put it into it quickly, so that the magnesium bar will burn naturally. Put the material in a container with 10 times the mass of clean water, stir evenly, and let it stand overnight at room temperature to produce precipitation. Collect the lower layer of sediment, put it in an oven, dry it at 105°C to constant weight, and then ...

example 2

[0022]First, in parts by weight, take 45 parts of ferric oxide, 35 parts of neodymium sesquioxide and 25 parts of aluminum tetroxide, mix them in a high-speed ball mill, add stainless steel balls with a particle size of 1.5 mm, and grind them at 310r / min for 8 minutes, further grind the mixture into powder, pass through a 300-mesh sieve, and put it into the reaction kettle, then add aluminum powder with 20% of the mixed powder mass to the reaction kettle, mix evenly, seal the reaction kettle, and put it into the reaction kettle. Curing at constant temperature for 1.5 hours. After the curing is over, open the reaction kettle, take the magnesium bars and ignite them and put them into it quickly to make the magnesium bars burn naturally. After the burning is completed, cool down to room temperature naturally; After cooling, put it in a container with 13 times the mass of clean water, stir evenly, and let it stand overnight at room temperature to produce precipitation. Collect the...

example 3

[0025] First, in parts by weight, get 55 parts of ferric oxide, 40 parts of neodymium trioxide and 30 parts of aluminum tetroxide, mix them in a high-speed ball mill, add stainless steel grinding balls with a particle diameter of 2mm, and grind them at 320r / m Treat the mixture for 10 minutes at 1 min, further grind the mixture into powder, pass through a 300-mesh sieve, and put it into the reaction kettle, then add aluminum powder with a mixed powder mass of 25% to the reaction kettle, mix evenly, seal the reaction kettle, and keep the temperature at 35°C Curing for 2 hours, when the curing is over, open the reaction kettle, take the magnesium bars and ignite them and put them into it quickly, so that the magnesium bars will burn naturally, after the burning is completed, naturally cool to room temperature; Put the material in a container with 15 times the mass of clean water, stir evenly, and let it stand overnight at room temperature to produce precipitation. Collect the lowe...

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Abstract

The invention discloses a method for preparing a neodymium-iron-boron magnetic material, belonging to the technical field of materials. The preparation method disclosed by the invention comprises the following steps of: adding aluminium powder after mixing iron trioxide, neodymium oxide and Al3O4, burning by utilizing a magnesium rod to generate a reactant, then, initially separating the generated reactant to remove light substances, such as generated magnesium oxide and aluminium oxide, further oxidizing, adding sodium borohydride solution to reduce at high temperature, and roasting to obtain the neodymium-iron-boron magnetic material. Examples prove that the method disclosed by the invention is relatively simple, and simple and convenient to operate; the quality and the production efficiency of the neodymium-iron-boron magnetic material are increased; the production cost is reduced; furthermore, the prepared neodymium-iron-boron magnetic material is difficult to oxidize and good in corrosion resistance; and thus, the neodymium-iron-boron magnetic material can be suitable for large-scale popularization and application.

Description

technical field [0001] The invention discloses a preparation method of an NdFeB magnetic material, belonging to the technical field of materials. Background technique [0002] At present, the new material industry, which is the foundation of the high-tech industry, has attracted much attention. As an important part of the new material industry, rare earth permanent magnet materials are widely used in energy, transportation, machinery, medical care, IT, home appliances and other industries. It is one of the important symbols of national strength and national economic development level. In particular, NdFeB, as the third-generation rare earth permanent magnet material, has broad market prospects and is mainly used in computer disk drives, nuclear magnetic resonance imaging instruments, various audio-visual equipment, microwave communications, magnetic machinery, household appliances, etc. At present, the NdFeB industry has also entered a critical period of development. The o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/02B22F3/10
CPCB22F3/02B22F3/10H01F1/0575
Inventor 郭延春贾卫东董碧峰李献雷赵献朋车方香
Owner 包头恒宇磁源科技有限公司
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