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A kind of neodymium iron boron magnet raw material powder and its processing technology

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

Active Publication Date: 2018-05-22
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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  • A kind of neodymium iron boron magnet raw material powder and its processing technology
  • A kind of neodymium iron boron magnet raw material powder and its processing technology
  • A kind of neodymium iron boron magnet raw material powder and its processing technology

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Experimental program
Comparison scheme
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] 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 plat...

Embodiment 2

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

[0081] 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 plat...

Embodiment 3

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

[0115] 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 nickel ...

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Abstract

The invention provides a NdFeB magnet raw material powder, which comprises NdFeB raw material fine powder and a nickel layer coated on the surface thereof. The present invention starts from the ground NdFeB magnet raw material powder, directly coats the powder produced by airflow milling with nickel plating, and coats the surface of the powder particles with a layer of nano-scale nickel coating, which improves the oxidation resistance of NdFeB powder. The ability prevents the powder from agglomerating into particle groups in the subsequent process, which is beneficial to the orientation of the powder and greatly improves the corrosion resistance of the sintered NdFeB magnet.

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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Patent Type & Authority Patents(China)
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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