Neodymium iron boron magnet made of neodymium iron boron nickel-plating waste materials in sintered mode

A technology of NdFeB and nickel plating, applied in the field of rare earth magnetic materials, can solve the problems of difficult to meet high requirements, low utilization rate of NdFeB waste, poor performance of NdFeB magnets, etc., and achieve low weight loss rate , Improved milling efficiency and good temperature stability

Active Publication Date: 2013-05-22
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

However, in this method, the mass percentage of the NdFeB magnet scrap in the mixture is usually below 50%, the utilization rate of the

Method used

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  • Neodymium iron boron magnet made of neodymium iron boron nickel-plating waste materials in sintered mode
  • Neodymium iron boron magnet made of neodymium iron boron nickel-plating waste materials in sintered mode
  • Neodymium iron boron magnet made of neodymium iron boron nickel-plating waste materials in sintered mode

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Production of N38 products using NdFeB nickel plating waste:

[0031] Roasting NdFeB nickel-plated waste: put the NdFeB nickel-plated waste in a sintering furnace, and heat up to 1100°C for roasting. The vacuum degree in the sintering furnace is less than 10 -1 Pa, the roasting time is 4 hours, then filled with nitrogen, fan cooling, until the temperature drops below 80 ° C, out of the furnace.

[0032] Preparation of NdFeB nickel-plating waste powder: put 600kg of roasted NdFeB nickel-plating waste into a vacuum quick-setting furnace for melting, and start heating and melting when the air in the furnace is pumped to a vacuum degree of 0.4Pa. When the material in the furnace turns red, fill it with argon, and heat up to 1450°C for smelting until the NdFeB nickel-plated waste is completely melted. Refined for 10 minutes and poured into flakes. The flakes were subjected to ICP component determination, and the component determination results are shown in Table 1. Then ...

Embodiment 2

[0049] Production of 35SH products with NdFeB nickel plating waste:

[0050] Roasting NdFeB nickel-plated waste: put the NdFeB nickel-plated waste in a sintering furnace, and heat up to 1120°C for roasting. The vacuum in the sintering furnace is lower than 10 -1 Pa, the roasting time is 4 hours, then filled with nitrogen, fan cooling, until the temperature drops below 80 ° C, out of the furnace.

[0051] Preparation of NdFeB nickel-plating waste powder: Mix 600kg of roasted NdFeB nickel-plating waste and put it into a vacuum quick-setting furnace for smelting. When the air in the furnace is pumped to a vacuum of 0.4Pa, heating and smelting begins. When the material in the furnace turns red, fill it with argon, and heat up to 1500°C for melting until the NdFeB nickel-plated waste is completely melted. Refined for 10 minutes and poured into flakes. The flakes were subjected to ICP composition determination, and the composition measurement results are shown in Table 5. Then p...

Embodiment 3

[0068] Production of 45H products with NdFeB nickel plating waste:

[0069] Roasting NdFeB nickel-plated waste: put the NdFeB nickel-plated waste in a sintering furnace, and heat up to 1130°C for roasting. The vacuum in the sintering furnace is lower than 10 -1 Pa, the roasting time is 4 hours, then filled with nitrogen, fan cooling, until the temperature drops below 80 ° C, out of the furnace.

[0070] Preparation of NdFeB nickel-plating waste powder: Mix 600kg of roasted NdFeB nickel-plating waste and put it into a vacuum quick-setting furnace for smelting. When the air in the furnace is pumped to a vacuum of 0.4Pa, heating and smelting begins. When the material in the furnace turns red, fill it with argon, and heat up to 1500°C for melting until the NdFeB nickel-plated waste is completely melted. Refined for 10 minutes and poured into flakes. The flakes were subjected to ICP composition determination, and the composition measurement results are shown in Table 9. Then pl...

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Abstract

The invention discloses a neodymium iron boron magnet made of neodymium iron boron nickel-plating waste materials in a sintered mode. The neodymium iron boron magnet resolves the problems that a neodymium iron boron magnet in the prior art is low in performance, low in utilizing rate of the waste materials and the like. The neodymium iron boron magnet is made of mixed materials through a sintering process, wherein the mixed materials are formed by the neodymium iron boron magnet nickel-plating waste materials and rich rare-earth compound material. For the neodymium iron boron magnet, residual magnetism (Br) of is greater than or equal to 1.2T, intrinsic coercive force (Hcj) is greater than or equal to 13.3 KOe, coercive force (Hcb) is greater than or equal to 11.6 KOe, the magnetic energy product (BH(max)) is greater than or equal to 34.8 MGOe, squareness (HK/Hcj) ranges from 0.97 to 0.98, the weight loss ratio is 0.19-1.10 mg/cm<2>, and the Br temperature coefficient is negative 0.090- negative 0.11% DEG C. The preparation method of the neodymium iron boron magnet comprises roasting the neodymium iron boron nickel-plating waste materials; manufacturing neodymium iron boron nickel-plating waste material powder; preparing the mixed materials; moulding in a compressed mode; and sintering. The preparation method is simple, effective, environment-friendly and low in cost.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnet, in particular to a neodymium-iron-boron magnet produced by sintering nickel-plated waste of neodymium-iron-boron, and belongs to the technical field of rare earth magnetic materials. technical background [0002] In recent years, with the rapid expansion of the application field of NdFeB magnets, the demand for raw materials has become larger and larger. However, due to the high cost of rare earth mining and the strengthening of national regulation, the cost of materials has gradually increased. increase. Under the current situation of excessive price increase, the price tolerance of the downstream market is relatively limited. Some downstream enterprises have chosen to use cheaper ferrite or AlNiCo, SmCo and other materials to replace the rare earth in the raw materials of NdFeB magnets. This brings greater instability to the NdFeB magnet market. In addition, NdFeB magnet materials are highly b...

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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