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High-performance neodymium-iron-boron magnet and preparation method thereof

A neodymium-iron-boron, high-performance technology, applied in the field of rare earth magnetic materials, can solve the problems of poor performance of neodymium-iron-boron magnets, low utilization rate, difficult to meet high-demand applications, etc. The effect of organization and improvement of wear resistance

Active Publication Date: 2013-05-08
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

[0004] However, in the method, the mass percentage of the NdFeB magnet waste in the mixture is usually below 50%, the utilization rate is not high, and the performance of the NdFeB magnet obtained is also poor, and it is difficult to meet the high requirements. Required application

Method used

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  • High-performance neodymium-iron-boron magnet and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Use NdFeB waste to produce 48M products:

[0030] Smelting NdFeB waste: directly mix 600kg NdFeB waste and put it into a vacuum quick-setting furnace. When the air in the furnace is evacuated to a vacuum of 0.4Pa, the heating and smelting is started. When the material in the furnace turns red, fill it with argon gas and heat it to 1450°C for smelting until the NdFeB waste is completely melted. After refining for 10 minutes, it is poured into a spun sheet, and the spun sheet is released when the temperature of the spun sheet is lower than 80°C.

[0031] Preparation of neodymium iron boron waste powder: the prepared spun sheet was subjected to ICP composition test, and the composition test results are shown in Table 1. After determining the composition, place the splinter in a hydrogen crusher, and pass hydrogen into the hydrogen crusher. After the product has completely absorbed hydrogen, the product is heated to 550°C for dehydrogenation for 6 hours. After the dehydrogenati...

Embodiment 2

[0047] Use NdFeB waste to produce 35EH products:

[0048] Smelting NdFeB waste: directly mix 600Kg of NdFeB waste and put it into a vacuum quick-setting furnace. When the air in the furnace is evacuated to a vacuum of 0.4Pa, heating and smelting are started. When the material in the furnace turns red, fill it with argon and heat it to 1480°C for smelting until the NdFeB waste is completely melted. After refining for 10 minutes, it is poured into a spun sheet, and the spun sheet is released when the temperature of the spun sheet is lower than 80℃.

[0049] Preparation of neodymium iron boron waste powder: the prepared spin film was subjected to ICP composition test, and the composition test results are shown in Table 3. After measuring the composition, place the spun sheet in a hydrogen crusher, and pass hydrogen into the hydrogen breaker. After the product completely absorbs hydrogen, it is heated to 580°C for dehydrogenation for 8 hours, and the oxygen content of the spun sheet a...

Embodiment 3

[0065] Use NdFeB waste to produce 42SH products:

[0066] Smelting NdFeB waste: directly mix 600Kg of NdFeB waste and put it into a vacuum quick-setting furnace. When the air in the furnace is evacuated to a vacuum of 0.4Pa, heating and smelting are started. When the material in the furnace turns red, fill it with argon gas and heat it to 1460°C for smelting until the NdFeB waste is completely melted. After refining for 10 minutes, it is poured into a spun sheet, and the spun sheet is released when the temperature is lower than 80°C.

[0067] Preparation of neodymium iron boron waste powder: the prepared spun sheet was subjected to ICP composition test, and the composition test results are shown in Table 5. After determining the composition, place the splinters in a hydrogen crusher, and pass hydrogen into the hydrogen crusher. After the product has completely absorbed hydrogen, it is heated to 600°C for 9 hours to dehydrogenate. After the dehydrogenation is completed, the splinte...

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Abstract

The invention discloses a high-performance neodymium-iron-boron magnet and a preparation method of the high-performance neodymium-iron-boron magnet. The high-performance neodymium-iron-boron magnet and the preparation method of the high-performance neodymium-iron-boron magnet solve the problems that an existing neodymium-iron-boron magnet is low in performance, low in waste material utilization rate and the like. The neodymium-iron-boron magnet is prepared by mixed materials composed of neodymium-iron-boron waste materials and rich rare earth alloy through sintering craft, mass percentage of the neodymium-iron-boron waste materials in the mixed materials is 70% to 99%, and the mass percentage of the rich rare earth alloy in the mixed materials is 1% to 30%. The performance of the neodymium-iron-boron magnet comprises: residual magnetism (Br) >=11.9 kGs, intrinsic coercivity (Hcjj) >=15 kOe, coercivity (Hcb) >=11.2 kOe, magnetic energy product ((BH) max) is from 34.8 MGOe to 48.0 MGOe, and rectangularity (HK / Hcj) is from 0.92 to 0.98. The preparation method of the high-performance neodymium-iron-boron magnet comprises: the neodymium-iron-boron waste materials are smelted; neodymium-iron-boron waste material powders are prepared; mixture is prepared; the neodymium-iron-boron magnet is molded; and the neodymium-iron-boron magnet is sintered. The neodymium-iron-boron magnet has the advantages of being high in performance, simple in preparation method and high in waste material utilization rate.

Description

Technical field [0001] The invention relates to a neodymium iron boron magnet, in particular to a high-performance neodymium iron boron magnet and a preparation method thereof, and belongs to the technical field of rare earth magnetic materials. technical background [0002] NdFeB magnet materials are widely used in international and domestic emerging industries and pillar industries, such as computer industry, information industry, communication industry, automobile industry, nuclear magnetic resonance imaging industry, office automation, etc., due to their good cost performance. However, the environmental cost of rare earths is high. With the increase of national control, the cost of their materials is getting higher and higher. In this big environment, lowering costs is particularly important. The existing NdFeB magnet forming process usually adopts a process of first pressing the blank and then machining to reach the required size of the product. However, due to the immaturi...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F7/02H01F41/02B22F3/16
Inventor 赵红良
Owner 宁波同创强磁材料有限公司
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