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Neodymium iron boron magnet raw material powder and treatment process therefor

A treatment process, NdFeB technology, applied in the field of NdFeB magnet raw material powder and its treatment process, can solve the problems of limiting the application of Nd-Fe-B materials, poor corrosion resistance of magnet materials, etc., to improve oxidation resistance, Effect of improving corrosion resistance and high magnetic properties

Active Publication Date: 2016-05-04
廊坊京磁精密材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industry's requirements for the magnetic properties of NdFeB magnets also have further requirements for other aspects, especially in terms of corrosion resistance. Since the main phase of NdFeB magnets is Nd 2 Fe 14 B, the grain boundary phase is Nd-rich phase, and the potential of the Nd-rich grain boundary phase is lower than that of the basic phase Nd 2 Fe 14 B and B-rich phase make the material show intergranular corrosion in the corrosive medium, so that the corrosion resistance of the magnet material is poor, which naturally greatly limits the application of Nd-Fe-B materials

Method used

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  • Neodymium iron boron magnet raw material powder and treatment process therefor
  • Neodymium iron boron magnet raw material powder and treatment process therefor
  • Neodymium iron boron magnet raw material powder and treatment process therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The verification is done with 38SH sintered NdFeB material, the raw material composition is shown in Table 1 below:

[0047] the element

[0048]First, according to the above formula, 600Kg of raw materials are prepared, among which iron rods are derusted, rare earth materials are treated without oil, moisture and rust, and the prepared raw materials are melted under the condition of medium frequency induction heating by vacuum smelting (SC) , and finally obtain a sheet-shaped fast-quenching NdFeB alloy with a columnar crystal structure.

[0049] Then, hydrogen absorption and dehydrogenation are carried out in the hydrogen breaking furnace to break into millimeter-sized coarse particles, and the secondary crusher further breaks the particles, and then through the jet mill with high-pressure nitrogen to grind out micron-sized powder with uniform particle size, and the average particle size of the powder is 4.0-5.0 μm.

[0050] Then carry out electroless nickel ...

Embodiment 2

[0080] The verification is done with 42SH sintered NdFeB material, the raw material composition is shown in Table 6 below:

[0081] the element

[0082] First, according to the above formula, 600Kg of raw materials are prepared, among which iron rods are derusted, rare earth materials are treated without oil, moisture and rust, and the prepared raw materials are melted under the condition of medium frequency induction heating by vacuum smelting (SC) , and finally obtain a sheet-shaped fast-quenching NdFeB alloy with a columnar crystal structure.

[0083] Then, hydrogen absorption and dehydrogenation are carried out in the hydrogen breaking furnace to break into millimeter-sized coarse particles. The secondary crusher further breaks the particles, and then passes through the jet mill with high-pressure nitrogen to grind out micron-sized powder with uniform particle size. The average particle size of the powder is 3.7-4.7 μm.

[0084] Then carry out electroless nickel ...

Embodiment 3

[0114] The verification is done with 45UH sintered NdFeB material, the raw material composition is shown in Table 11 below:

[0115] the element

[0116] First, according to the above formula, 600Kg of raw materials are prepared, among which iron rods are derusted, rare earth materials are treated without oil, moisture and rust, and the prepared raw materials are melted under the condition of medium frequency induction heating by vacuum smelting (SC) , and finally obtain a sheet-shaped fast-quenching NdFeB alloy with a columnar crystal structure.

[0117] Then, hydrogen absorption and dehydrogenation are carried out in the hydrogen breaking furnace to break into millimeter-sized coarse particles. The secondary crusher further breaks the particles, and then passes through the jet mill with high-pressure nitrogen to grind out powder with uniform particle size and micron size. The average particle size of the powder is 3.5-4.5 μm.

[0118] Then carry out electroless nic...

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Abstract

The invention provides neodymium iron boron magnet raw material powder. The neodymium iron boron magnet raw material powder comprises neodymium iron boron raw material thin powder and a nickel layer coating the surface of the neodymium iron boron raw material thin powder. According to the treatment process, the milled neodymium iron boron magnet raw material powder is adopted; the powder milled by an airflow mill is directly coated and plated with nickel; the surfaces of the powder granules are coated with a nano-scale nickel-plated layer, so that the oxidization resistance of the neodymium iron boron powder is improved, granular groups formed by powder agglomeration are prevented in the subsequent process, the orientated forming of the powder is facilitated, and the corrosion resistance of the sintered neodymium iron boron magnet is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet preparation, and in particular relates to a neodymium-iron-boron magnet raw material powder and a treatment process thereof. Background technique [0002] Permanent magnets are hard magnets, magnets that can maintain their magnetism for a long time, and are not easy to lose their magnetization or be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets mean that by synthesizing alloys of different materials, the same effect as natural magnets (magnets) can be achieved, and the magnetic force can also be improved. Artificial magnets appeared as early as the 18th century, but the process of manufacturing stronger magnetic materials was very slow. It was not until the manufacture of AlNiCo magnets (AlNiCo) in the 193...

Claims

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Application Information

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IPC IPC(8): H01F1/057B22F1/02
CPCH01F1/0572B22F1/17
Inventor 刘润海马驰刘月玲
Owner 廊坊京磁精密材料有限公司
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