NdFeB magnet and preparation method thereof

A technology of neodymium iron boron and magnets, which is applied in the field of rare earth magnetic materials, can solve the problems of formula cost increase and resource waste, and achieve the effects of obvious intrinsic coercive force, resource saving, and improvement of utilization rate

Active Publication Date: 2014-09-24
宁波同创强磁材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, we need to add this part of rare earth loss to the formula, resulting in an increase in formula cost and waste of resources

Method used

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  • NdFeB magnet and preparation method thereof
  • NdFeB magnet and preparation method thereof
  • NdFeB magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Production of 48H products:

[0030] The composition ratio of the main phase alloy:

[0031]

[0032] S1. Put the ferrodysprosium hydride into the hydrogen crushing furnace for hydrogen crushing. After the ferrodysprosium has completely absorbed hydrogen, the temperature is raised to 550-600°C for dehydrogenation for 6-9 hours. 1-2μm heavy rare earth alloy powder, ready for use;

[0033] S2. Weigh the raw materials of the main phase alloy according to the above formula, mix them directly and put them into the vacuum quick-setting furnace. When the vacuum belt furnace is evacuated to 0.4Pa, start heating and melting. When the material in the furnace turns red, fill it with Argon, and heat up to 1450°C for smelting until the raw materials are completely melted, pouring after refining for 10 minutes, and when the flakes are lower than 80°C, the main phase alloy flakes are placed in the hydrogen crushing furnace, and then poured into the hydrogen crushing furnace Intro...

Embodiment 2

[0045] Production of 35UH products:

[0046] The composition ratio of the main phase alloy:

[0047]

[0048] S1. Put dysprosium ferrohydride and holmium ferrohydride into a hydrogen crushing furnace for hydrogen crushing. After the dysprosium ferrohydride has completely absorbed hydrogen, heat up to 550-600°C for dehydrogenation for 6-9 hours. After the dehydrogenation is complete, use a jet mill Make the heavy rare earth alloy powder with a particle size of 1-2 μm, and take the heavy rare earth alloy powder containing 0.5% dysprosium iron hydride and 0.5% holmium iron hydride for use;

[0049] S2. Weigh the raw materials of the main phase alloy according to the above formula, mix them directly and put them into the vacuum quick-setting furnace. When the vacuum belt furnace is evacuated to 0.4Pa, start heating and melting. When the material in the furnace turns red, fill it with Argon, and heat up to 1450°C for smelting until the raw materials are completely melted, pouri...

Embodiment 3

[0061] Production of 33EH products:

[0062] The composition ratio of the main phase alloy:

[0063]

[0064] S1. Put dysprosium ferrohydride and holmium ferrohydride into a hydrogen crushing furnace for hydrogen crushing. After the dysprosium ferrohydride completely absorbs hydrogen, raise the temperature to 550-600°C for dehydrogenation for 6-9 hours. Use jet mill after complete dehydrogenation Make a heavy rare earth alloy powder with a particle size of 1-2 μm, and take the heavy rare earth alloy powder containing 2.5% dysprosium iron hydride and 0.5% holmium iron hydride for use;

[0065] S2. Weigh the raw materials of the main phase alloy according to the above formula, mix them directly and put them into the vacuum quick-setting furnace. When the vacuum belt furnace is evacuated to 0.4Pa, start heating and melting. When the material in the furnace turns red, fill it with Argon, and heat up to 1470°C for smelting until the raw materials are completely melted, pouring ...

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Abstract

The invention relates to an NdFeB magnet and belongs to the technical field of rare earth magnetic materials. The NdFeB magnet is prepared by sintering a mixture of main phase alloy powder with the granularity of 2-5 <Mu>m, heavy rare earth alloy powder with the granularity of 1-2 <Mu>m and superfine powder with the granularity of 0.1-1.5 <Mu>m, which are mixed at the mass percents of 85-99.8, 0.1-10 and 0.1-5 respectively, the heavy rare earth alloy is one or more of dysprosium hydride and dysprosium-ferrum hydride compound, a holmium hydride and holmium-ferrum hydride compound and terbium hydride and terbium-ferrum hydride compound. The invention further provides a preparation method of the NdFeB magnet. According to the invention, 10-40 percent of heavy rare earth is saved, and the intrinsic coercive field of the NdFeB magnet is increased greatly without reducing the effect of residual magnetism.

Description

technical field [0001] The invention relates to a neodymium iron boron magnet, which belongs to the technical field of rare earth magnetic materials. technical background [0002] Since the sintered NdFeB permanent magnet material was discovered in 1983, it has been widely used in international and domestic emerging development industries and pillar industries due to its good cost performance, such as computer hard disk technology, nuclear magnetic resonance imaging technology, electric vehicles, wind power generators , Industrial permanent magnet motors, electronics industry, magnetic levitation technology, magnetic transmission and other high-tech fields. With the continuous development and application of sintered NdFeB, the global output of sintered NdFeB was 69 tons in 1985, and it had grown to 83,000 tons by 2012. With the substantial increase in output, rare earth resources, especially heavy rare earth resources, are also rapidly consume. According to incomplete stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F3/16
Inventor 赵红良范逢春张子祥
Owner 宁波同创强磁材料有限公司
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