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Manufacturing method of rare earth permanent magnet

A technology of rare earth permanent magnets and manufacturing methods, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problems of uneven grain growth, high air pressure control requirements, and difficult ultra-fine powder, etc., to achieve Reduce the content of heavy rare earths, improve the uniformity of grain size, and improve the effect of magnet consistency

Active Publication Date: 2018-05-15
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method requires high air pressure control, and it is difficult to effectively remove ultrafine powder, and it is difficult to effectively control the particle size and distribution of magnetic powder
The existence of ultra-fine powder will cause uneven growth of crystal grains, which limits the stability of magnetic properties and limits the high performance of magnets

Method used

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  • Manufacturing method of rare earth permanent magnet

Examples

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Effect test

Embodiment 1

[0054] Produce the rare earth permanent magnet of embodiment 1 according to the following steps, its molecular formula is Nd 13.8 Fe 78.06 B 5.89 Cu 0.1 co 1 Dy 0.3 al 0.6 Nb 0.2 Ga 0.05 .

[0055] (1) The magnet raw materials are prepared according to the nominal composition of the magnet (ie, the atomic percentage), placed in a vacuum intermediate frequency quick-setting induction furnace, vacuumed below 1Pa, preheated at 120kW, the vacuum rises, and then vacuumed to below 1Pa again. Fill with argon to 0.05MPa, then melt at 1500°C, pour the molten liquid (alloy melt) onto the cooling copper roll with free surface cooling device, and adjust the temperature difference between the surface of the sticking roll and the free surface The temperature is controlled at 1-10° C. to obtain an alloy sheet with a thickness of 0.25 mm.

[0056] (2) The alloy flakes are placed in a hydrogen crushing furnace, and crushed into 200 μm alloy powders through low-temperature hydrogen abs...

Embodiment 2

[0061] except the molecular formula is Nd 13.6 Fe 78.06 B 5.89 Cu 0.1 co 1 Dy 0.5 al 0.6 Nb 0.2 Ga 0.05 And except that the nominal composition of the magnet is different, the rest of the steps are the same as in Example 1.

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Abstract

The invention provides a method for manufacturing a rare earth permanent magnet, which includes the following steps: S1) smelting and stripping step: smelting the raw material of the magnet, and then pouring it on a cooling roll to form an alloy melt with a roll-attached surface and a free surface. The alloy melt is cooled to form an alloy flake; wherein, the temperature difference between the roll-adhesive surface and the free surface is controlled at 1-30°C, and the thickness of the alloy flake is 0.1-0.8mm; The alloy flakes obtained in step S1) are crushed into alloy powder with an average particle size of 10-2000 μm, and then the alloy powder is formed into magnetic powder with an average particle size of 2-8 μm; wherein, D90 / D10 is 3-5. By adopting the method of the invention, a high-performance magnet can be obtained, the consistency of the magnet is also improved, and at the same time, the content of the heavy rare earth is effectively reduced.

Description

technical field [0001] The invention relates to a manufacturing method of a rare earth permanent magnet, in particular to a manufacturing method of a sintered NdFeB permanent magnet. Background technique [0002] At present, sintered NdFeB permanent magnets have been widely used in many fields such as electronics, computers, automobiles, machinery, and medical treatment. Due to the excellent magnetic properties and low price of sintered NdFeB permanent magnets, their demand and application range are still expanding rapidly. Some fields require sintered NdFeB permanent magnets with higher energy product and coercive force. However, it is difficult to obtain sintered NdFeB permanent magnets with higher energy product and coercive force cheaply by the existing NdFeB manufacturing methods. [0003] At present, the coercive force of permanent magnets is usually increased by replacing part of Pr and Nd with heavy rare earths Dy and Tb; but this not only increases the cost, but al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02B22F9/04B22F1/00B22F3/02B22F3/10B22F3/24
CPCH01F1/0575H01F41/0266B22F3/02B22F3/10B22F3/24B22F9/04B22F2003/248B22F1/052
Inventor 吴树杰董义苗聚昌刁树林袁易陈雅袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD