Sintering method of sintered neodymium-iron-boron permanent magnet material

A sintering method and permanent magnet material technology, applied in the direction of magnetic materials, magnetic objects, inductance/transformer/magnet manufacturing, etc., can solve the problem of unexpected improvement of coercive force, solid phase sintering, grain growth, etc. problem, to achieve the effect of inhibiting grain growth, ensuring grain refinement, and low cost

Inactive Publication Date: 2019-12-03
宁波爱维森材料研发科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a sintering process will lead to the liquid-phase sintering shrinkage in the area where the small particles or the Nd-rich phase distribution are relatively large in the magnet, and the sintering shrinkage will be relatively delayed in the area where the particles are larger or the Nd-rich phase distribution is relatively small, and the small particles that sintered first shrink in the same Continue to keep warm at the sintering temperature, solid phase sintering will occur, the grains will grow, and the coercive force will not be improved as expected

Method used

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  • Sintering method of sintered neodymium-iron-boron permanent magnet material
  • Sintering method of sintered neodymium-iron-boron permanent magnet material
  • Sintering method of sintered neodymium-iron-boron permanent magnet material

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Embodiment 1

[0027] will be composed as Nd 10.2 PR 3.5 Dy 0.4 co 1.0 Cu 0.2 Al 0.2 Ga 0.1 Zr 0.1 B 5.7 Fe 78.6 (Atomic percentage) for batching, melting under the protection of inert gas, and then casting into cast pieces. The cast piece is coarsely crushed by the hydrogen crushing process, and then ground into a fine powder with a particle size of 4.0um (particle size: D50) by a jet mill, oriented and pressed into a compact in a molding press under the protection of nitrogen, and then sent to sintering furnace for sintering. The sintering process is as follows: from room temperature to 300°C, hold for 1 hour, then heat up to 600°C, hold for 2 hours, then heat up to 800°C, hold for 3 hours; when the temperature is 20°C lower than the optimum sintering temperature (the optimum sintering temperature is 1060°C) , that is, 1040°C, hold for 5h, and finally raise the temperature to the optimum sintering temperature of 1060°C, hold for 1.5h. After sintering, it is filled with argon gas...

Embodiment 2

[0034] will be composed as Nd 10.3 PR 3.5 Dy 0.4 Tb 0.2 co 1.1 Cu 0.2 Al 1.0 Ga 0.2 Zr 0.1 B 5.7 Fe 77.3 (Atomic percentage) for batching, melting under the protection of inert gas, and then casting into cast pieces. The cast piece is coarsely crushed by the hydrogen crushing process, then ground into a fine powder with a particle size of 3.8um (particle size D50) by a jet mill, oriented and pressed in a molding press under the protection of nitrogen to form a compact, and then sent to sintering furnace for sintering. The sintering process is as follows: from room temperature to 300°C, hold for 1 hour, then heat up to 600°C, hold for 2 hours, then heat up to 800°C, hold for 3 hours; when the temperature is 20°C lower than the optimum sintering temperature (the optimum sintering temperature is 1065°C) , that is, 1050°C, hold for 5h, and finally raise the temperature to the optimum sintering temperature of 1065°C, hold for 2h. After sintering, it is filled with argon...

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Abstract

The invention relates to a sintering method of a sintered neodymium-iron-boron permanent magnet material. The sintering method comprises the following steps of: (1) putting a sintered neodymium-iron-boron green body into a sintering furnace, performing vacuumizing, heating, heating from a room temperature to a temperature of 200-400 DEG C, keeping the temperature for 0.5-2 hours, continuously heating to a temperature of 500-900 DEG C, and keeping the temperature for 2-8 hours; (2) after the heat preservation in the step (1) is finished, rising the temperature to a temperature lower than the optimal sintering temperature by 10-30 DEG C, and carrying out heat preservation for 4-8 hours, keeping the temperature for 0.5-2 hours at the optimal sintering temperature, and finally performing cooling. A new sintering method is introduced during liquid-phase sintering shrinkage, solid-phase sintering and grain growth are inhibited, and grain refinement of the magnet is ensured, so that the coercive force is definitely improved; and moreover, the method is simple and low in cost, and has a good market application prospect.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a sintering method of sintered NdFeB permanent magnet materials. Background technique [0002] Sintered NdFeB permanent magnet material belongs to the third generation of rare earth permanent magnet material, and it is also the permanent magnet material with the highest comprehensive magnetic performance at present. It is widely used in new energy vehicles, electronic products, wind power generation and various industrial motors. The magnetic performance parameters of sintered NdFeB permanent magnet materials generally include remanence (Br), intrinsic coercive force (Hcj) and magnetic energy product ((BH)m), where the intrinsic coercive force is to ensure the magnetic properties of the magnet. important parameter for stability. [0003] The usual way to increase the coercive force of sintered NdFeB magnets is to add heavy rare earth elements, but this will r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253
Inventor 彭维波杨霞
Owner 宁波爱维森材料研发科技有限公司
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