Sintering method of neodymium-iron-boron magnet

A sintering method, NdFeB technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems affecting magnetic properties, grain growth, etc., and achieve the effect of uniform grain size and increased coercive force

Active Publication Date: 2016-12-21
京磁材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding rare earth elements to magnets is a major means of improving magnetic properties, but as the price of heavy rare earths continues to rise, the industry needs to consider cost factors and reduce the use of heavy ra

Method used

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  • Sintering method of neodymium-iron-boron magnet
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  • Sintering method of neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] This embodiment adopts the design composition as (PrNd) 32.5 B 0.88 Al 0.66 Cu 0.15 co 1.2 Ga 0.5 Zr 0.2 Fe 其余 The formula is equipped with raw materials, using flake flakes, hydrogen explosion, and jet milling techniques, using a fully automatic sealed press to press, isostatic pressing, and then sintering according to the sintering method of the present invention, and then performing primary and secondary tempering to obtain the blank Test properties and microstructure metallography.

[0084] Firstly, raw materials are prepared according to the ratio of 32.5% NdPr, 0.88% Boron, 0.66% Aluminum, 0.15% Copper, 1.2% Cobalt, 0.5% Gallium, 0.2% Zirconium, and the rest iron.

[0085] Then, the raw materials are smelted by using the strip-spinning process, and the strips are prepared into strips, and the thickness of the strips is controlled between 0.25-0.3mm.

[0086] Then use the hydrogen explosion + jet mill process to grind the flakes into fine powder, and the pa...

Embodiment 2

[0097] This embodiment adopts the design composition as (PrNd) 32.5 B 0.88 Al 0.66 Cu 0.15 co 1.2 Ga 0.5 Zr 0.2 Fe 其余 The formula is equipped with raw materials, using flake flakes, hydrogen explosion, and jet milling techniques, using a fully automatic sealed press to press, isostatic pressing, and then sintering according to the sintering method of the present invention, and then performing primary and secondary tempering to obtain the blank Test properties and microstructure metallography.

[0098] Firstly, raw materials are prepared according to the ratio of 32.5% NdPr, 0.88% Boron, 0.66% Aluminum, 0.15% Copper, 1.2% Cobalt, 0.5% Gallium, 0.2% Zirconium, and the rest iron.

[0099] Then, the raw materials are smelted by using the strip-spinning process, and the strips are prepared into strips, and the thickness of the strips is controlled between 0.25-0.3mm.

[0100] Then use the hydrogen explosion + jet mill process to grind the flakes into fine powder, and the pa...

Embodiment 3

[0110] This embodiment adopts the design composition as (PrNd) 30.6 Dy 1.2 B 0.88 Al 0.5 Cu 0.15 co 1.2 Ga 0.32 Zr 0.17 Fe 其余 The formula is equipped with raw materials, using flake flakes, hydrogen explosion, and jet milling techniques, using a fully automatic sealed press to press, isostatic pressing, and then sintering according to the sintering method of the present invention, and then performing primary and secondary tempering to obtain the blank Test properties and microstructure metallography.

[0111] Firstly, the raw materials are prepared according to the ratio of 30.6% NdPr, 1.2% Dysprosium, 0.88% Boron, 0.5% Aluminum, 0.15% Copper, 1.2% Cobalt, 0.32% Gallium, 0.17% Zirconium, and the rest iron.

[0112] Then, the raw materials are smelted by using the strip-spinning process, and the strips are prepared into strips, and the thickness of the strips is controlled between 0.25-0.3mm.

[0113] Then use the hydrogen explosion + jet mill process to grind the flak...

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Abstract

The invention provides a sintering method of a neodymium-iron-boron magnet. A plurality of steps in a preparation process of the neodymium-iron-boron magnet are analyzed; grain growth can be significantly prevented by use of a segmented sintering method from a neodymium-iron-boron sintering process; and the magnet with fine grains and uniform density is obtained, so that the magnetic property of the magnet is significantly improved; especially for the neodymium-iron-boron magnet with low rare earth content, the problems that grains abnormally grow and the residual magnetism and the square degree of the magnet cannot reach the requirements due to the fact that the granularity of neodymium-iron-boron magnet powder and the oxygen content in the process are reduced are solved when heavy rare earth content is reduced within the industry. By the method provided by the invention, the neodymium-iron-boron magnet which is free of abnormal grain growth and has better residual magnetism and square degree can be obtained.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to a sintering method of an NdFeB magnet. Background technique [0002] Hard magnets are permanent magnets, magnets that can maintain their magnetism for a long time, and are not easy to lose their magnetization or be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets mean that by synthesizing alloys of different materials, the same effect as natural magnets (magnets) can be achieved, and the magnetic force can also be improved. In the 1960s, the emergence of rare earth permanent magnets opened up a new era for the application of magnets. The first generation of samarium cobalt permanent magnets SmCo 5 , the second generation of precipitation hardening samarium cobalt permanent mag...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/10
CPCB22F3/1017B22F3/1028H01F1/0577H01F41/0253
Inventor 余远
Owner 京磁材料科技股份有限公司
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