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Preparation process for sintering 1kg-5.5kg of neodymium iron boron permanent magnetic material

A technology of permanent magnet material and preparation process, which is applied in the direction of magnetic materials, manufacturing tools, and the magnetism of inorganic materials, etc., and can solve the problem of unsatisfactory magnetic properties of NdFeB permanent magnet materials, dark cracks, cracking of NdFeB permanent magnet materials, etc. problem, to achieve the effect of increasing size, reducing cracking and preventing rapid cooling

Active Publication Date: 2013-04-24
JIANGSU JINSHI RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of sintering NdFeB permanent magnet materials only adopts one tempering treatment, the magnetic properties of NdFeB permanent magnet materials are not very ideal, and the rapid cooling method is also easy to cause cracks or dark cracks in NdFeB permanent magnet materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: 1.5 kilograms of sintered NdFeB permanent magnet materials are produced according to the following steps in the present embodiment:

[0016] ⑴Ingredient: According to different grades of NdFeB design specific ingredient ingredients.

[0017] ⑵Smelting: Use the quick-setting throwing belt furnace to smelt to make cast pieces, that is to say, in the quick-setting throwing belt furnace, the prepared various metal raw materials will be placed according to the melting point from high to low and from bottom to top. Put the furnace cover on and start vacuuming. After the vacuuming is complete, all the metals are melted and the molten metals are stirred evenly by the principle of electromagnetic stirring. The alloy steel is poured on a water-cooled roller with a speed of 35 rpm Liquid rapid cooling into thin slices with a thickness of 0.3 mm.

[0018] (3) Milling process: the first step of hydrogen crushing: place the NdFeB alloy flakes in a hydrogen environment,...

Embodiment 2

[0023] Embodiment 2: 5.5 kilograms of sintered NdFeB permanent magnet materials are produced according to the following steps in the present embodiment:

[0024] ⑴Ingredient: According to different grades of NdFeB design specific ingredient ingredients. .

[0025] ⑵Smelting: Use the quick-setting throwing belt furnace to smelt to make cast pieces, that is to say, in the quick-setting throwing belt furnace, the prepared various metal raw materials are placed according to the melting point from high to low and from bottom to top. Close the furnace cover and start vacuuming. After the vacuuming is completed, all the metals are melted and the molten metals are stirred evenly by using the principle of electromagnetic stirring. The molten steel is rapidly cooled into thin slices with a thickness of 0.3 mm to 0.5 mm.

[0026] (3) Milling process: the first step of hydrogen crushing: place the NdFeB alloy flakes in a hydrogen environment, in which the hydrogen purity is 99.9%, and t...

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Abstract

The invention discloses a preparation process for sintering 1kg-5.5kg of neodymium iron boron permanent magnetic materials, which belongs to the technical field of neodymium iron boron materials. The preparation process comprises the following steps of firstly, preparing materials; secondly, smelting, namely smelting the materials into cast pieces by using a rapid condensing melt-spinning furnace; thirdly, making powder, including hydrogen decrepitation and airflow milling; fourthly, shaping, namely, firstly magnetizing, secondly demagnetizing, compressing and shaping, pushing the compressed magnet pieces to an organic glass board, packaging in vacuum, carrying out equal static pressure treatment and eliminating the oil; and fifthly sintering, namely, putting the shaped blanks into a vacuum sintering furnace, heating and sintering, and carrying out sintering and tampering treatment in a primary tempering mode, a secondary tempering mode and an in-furnace insert gas cooling mode. The preparation process has the beneficial effects that by adopting appropriate magnetizing and demagnetizing, the material is easy to shape in compression; by adopting twice tempering and fan cooling, the magnetism of the magnet is improved, and crack and layering of a large piece of neodymium iron boron material are reduced, so that the size of the prepared neodymium iron boron material is enlarged.

Description

technical field [0001] The invention relates to a preparation process of sintered NdFeB permanent magnet material, in particular to a preparation process of sintered 1 kg to 5.5 kg NdFeB permanent magnet material, belonging to the technical field of sintered NdFeB material. Background technique [0002] At present, NdFeB permanent magnet materials are widely used in electronics, automobiles, energy, machinery and other fields. With the development of science and technology, the size and performance requirements of NdFeB permanent magnet materials are getting higher and higher. For example, in the field of wind power generation, nuclear magnetic resonance requires large magnets. [0003] According to the existing method, when the mass is greater than 1 kg, the difficulty of the preparation process increases, and it is difficult to press and form, and when the mass reaches 1.5 kg to 5.5 kg, it is even more difficult to press and form. When the pressure is increased, due to th...

Claims

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Application Information

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IPC IPC(8): C22C33/02C22C38/00C22C33/04C21D1/18C21D9/00H01F1/057H01F1/08
Inventor 王志远吴滨刘国祥肖暾吕殿国
Owner JIANGSU JINSHI RARE EARTH CO LTD
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