Treating method for improving performance of sintered NdFeB (neodymium iron boron) materials

A treatment method and material performance technology, which is applied in the direction of inorganic material magnetism, magnetic materials, metal material coating technology, etc., can solve the problems of reducing the remanence of magnets, etc.

Inactive Publication Date: 2015-06-03
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the production of sintered NdFeB magnets, the addition of Al and Ga elements is the traditional alloying method, that is, adding Al or Ga metals directly to form a multi-element alloy during smelting, so that Al and Ga elements are inevitable. Part of it enters the main phase, which inevitably reduces the remanence of the magnet while increasing the coercive force

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Take the component as (PrNd) 31 Fe 余 B 1 al 0.3 Cu 0.1 co 0.5 Sintered NdFeB magnets;

[0031] (2) Use a slicer to cut into 6 pieces of magnetic pieces with a size of 18mm×18mm×2mm;

[0032] (3) Add 20 grams of Ho 2 o 3 Dissolve the powder in 50ML nitric acid solution, then dilute the nitric acid solution to 100ML, add 1 gram of bentonite, stir the solution evenly with a glass rod, put the above 6 pieces of magnets in the solution, stir for 2 minutes, take out the magnet pieces and drain, Then dry the magnetic sheet with a hot air oven;

[0033] (4) Heat the dried magnetic sheet to 900°C for 6 hours in a vacuum sintering furnace, cool it to below 80°C, then heat it up to 500°C for 3 hours, then cool it to below 80°C and take it out with B-H The permanent magnet material tester evaluates its performance.

[0034] The result of table 1 embodiment 1

[0035] Preparation Process Remanence (T) Intrinsic coercivity (KOe) Maximum Magnetic Energy P...

Embodiment 2

[0037] (1) Take the component as (PrNd) 31 Fe 余 B 1 al 0.3 Cu 0.1 co 0.5 Sintered NdFeB magnets;

[0038] (2) Use a slicer to cut into 6 pieces of magnetic pieces with a size of 18mm×18mm×2mm;

[0039] (3) Add 20 grams of Dy 2 o 3 Dissolve the powder in 50ML nitric acid solution, then dilute the nitric acid solution to 100ML, add 1 gram of bentonite, stir the solution evenly with a glass rod, put the above 6 pieces of magnets in the solution, stir for 2 minutes, take out the magnet pieces and drain, Then dry the magnetic sheet with a hot air oven;

[0040] (4) Heat the dried magnetic sheet to 900°C for 6 hours in a vacuum sintering furnace, cool it to below 80°C, then heat it up to 500°C for 3 hours, then cool it to below 80°C and take it out with B-H The permanent magnet material tester evaluates its performance.

[0041] The result of table 2 embodiment 2

[0042] Preparation Process Remanence (T) Intrinsic coercivity (KOe) Maximum Magnetic Energy P...

Embodiment 3

[0044] (1) Take the component as (PrNd) 31 Fe 余 B 1 al 0.3 Cu 0.1 co 0.5 Sintered NdFeB magnets;

[0045] (2) Use a slicer to cut into 6 pieces of magnetic pieces with a size of 18mm×18mm×2mm;

[0046] (3) Add 10 grams of Dy 2 o 3 powder and 10 g Ho 2 o 3 Dissolve the powder in 50ML nitric acid solution, then dilute the nitric acid solution to 100ML, add 1 gram of bentonite, stir the solution evenly with a glass rod, put the above 6 pieces of magnets in the solution, stir for 2 minutes, take out the magnet pieces and drain, Then dry the magnetic sheet with a hot air oven;

[0047] (4) Heat the dried magnetic sheet to 900°C for 6 hours in a vacuum sintering furnace, cool it to below 80°C, then heat it up to 500°C for 3 hours, then cool it to below 80°C and take it out with B-H The permanent magnet material tester evaluates its performance.

[0048] The result of table 3 embodiment 3

[0049] Preparation Process Remanence (T) Intrinsic coercivity (KOe) ...

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Abstract

The invention discloses a treating method for improving performance of sintered NdFeB (neodymium iron boron) materials and belongs to the field of sintered NdFeB (neodymium iron boron) magnet preparing. By means of post-changing of a microstructure and ingredients of a sintered NdFeB magnet, coercive force of the sintered NdFeB magnet is increased. The treating method includes the steps of forming a coating layer comprising one of or a combination of a variety of Dy, Tb, Ho, Al and Ga on the surface of the sintered NdFeB magnet, and heating the sintered NdFeB magnet up to the temperature lower than the sintering temperature of a base material of the magnet so as to perform tempering heat treatment. According to the treating method, one of or more of the Dy, the Tb, the Ho, the Al and the Ga in the coating layer are diffused to the crystal boundary position inside the base material of the magnet, so that the microstructure and partial ingredients of the magnet are improved, and the coercive force of the sintered NdFeB magnet is increased.

Description

technical field [0001] The invention belongs to the field of preparation of sintered neodymium-iron-boron (Nd-Fe-B) magnets, and in particular relates to a treatment method for improving the coercive force of sintered Nd-Fe-B magnets. Background technique [0002] NdFeB permanent magnet material, as the third generation of rare earth permanent magnet material, was first commercialized by Japan’s Sumitomo Metal and American GM Corporation in 1983. Due to its characteristics of high remanence, high coercive force and high magnetic energy product, it has been widely used. It is used in power electronics, communication, information, transportation office automation, medical equipment and military and other fields. [0003] Sintered NdFeB magnets are mainly composed of the main phase Nd 2 Fe 14 B. Composition of Nd-rich phase and boron-rich phase, Nd-rich phase surrounds the main phase Nd 2 Fe 14 Around phase B, a small amount of boron-rich phase is distributed in some grain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02C23C10/18
Inventor 陈云志王志坚刘宇晖苏正夫邓月华朱望伟彭雁游建辉兰石琨
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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