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Heat treatment method for improving consistency of intrinsic coercive force of neodymium iron boron blank

A technology of intrinsic coercive force and heat treatment method, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of long heat treatment time and poor consistency of intrinsic coercive force, so as to ensure consistency and improve consistency , Improve the effect of thermal insulation performance

Inactive Publication Date: 2018-11-30
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for improving the consistency of the intrinsic coercive force of NdFeB blanks in order to solve the problems of poor consistency of intrinsic coercive force and excessively long heat treatment time among NdFeB blanks prepared under the current traditional heat treatment process. Sexual heat treatment method

Method used

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  • Heat treatment method for improving consistency of intrinsic coercive force of neodymium iron boron blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: choose the compact of 45M grade, adopt the heat treatment method of the present invention, comprise the following specific steps:

[0022] Step 1: Put the oriented NdFeB compact into a stone mill box in a nitrogen-filled glove box, cover the stone mill box, and push it into a vacuum sintering furnace for sintering;

[0023] Step 2: After sintering, the magnet is self-cooled to 850°C, then kept for 0.5h, and then heated up to enter the primary aging stage;

[0024] Step 3: After the primary aging is over, the magnet is air-cooled to 80°C, and then the temperature is raised to enter the secondary aging stage;

[0025] Step 4: After the secondary aging, air-cool the magnet to 80°C and take it out of the furnace, remove the lid of the stone mill box, and cool the magnet to 40°C with a fan to obtain a NdFeB blank.

[0026] Among them, the heating process of primary aging is as follows: the temperature in the sintering furnace is raised to 905°C at a speed of 4...

Embodiment 2

[0031] Embodiment 2: choose the compact of 45M grade, adopt the heat treatment method of the present invention, comprise the following concrete steps:

[0032] Step 1: Put the oriented NdFeB compact into a stone mill box in a nitrogen-filled glove box, cover the stone mill box, and push it into a vacuum sintering furnace for sintering;

[0033] Step 2: After sintering, the magnet is self-cooled to 800°C, then kept for 0.5h, and then heated up to enter the primary aging stage;

[0034] Step 3: After the primary aging is over, the magnet is air-cooled to 80°C, and then the temperature is raised to enter the secondary aging stage;

[0035] Step 4: After the secondary aging, air-cool the magnet to 80°C and take it out of the furnace, remove the lid of the stone mill box, and cool the magnet to 40°C with a fan to obtain a NdFeB blank.

[0036] Among them, the heating process of primary aging is as follows: the temperature in the sintering furnace is raised to 905°C at a speed of 4...

Embodiment 3

[0041] Embodiment 3: choose the 45M brand compact, adopt the heat treatment method of the present invention, comprise the following specific steps:

[0042] Step 1: Put the oriented NdFeB compact into a stone mill box in a nitrogen-filled glove box, cover the stone mill box, and push it into a vacuum sintering furnace for sintering;

[0043] Step 2: After sintering, the magnet is self-cooled to 700°C, then kept for 0.5h, and then heated up to enter the primary aging stage;

[0044] Step 3: After the primary aging is over, the magnet is air-cooled to 80°C, and then the temperature is raised to enter the secondary aging stage;

[0045] Step 4: After the secondary aging, air-cool the magnet to 80°C and take it out of the furnace, remove the lid of the stone mill box, and cool the magnet to 40°C with a fan to obtain a NdFeB blank.

[0046] Among them, the heating process of primary aging is as follows: the temperature in the sintering furnace is raised to 905°C at a speed of 4°C / ...

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Abstract

The invention discloses a heat treatment method for improving the consistency of the intrinsic coercive force of neodymium iron boron blank. The method includes the following steps: step one, putting,in a glove box filled with nitrogen, the formed neodymium iron boron pressing blank into a stone mill box, adding a cover on the stone mill box, and pushing the stone mill box into a vacuum sinteringfurnace for sintering; step two, after sintering, self-cooling the magnetic body to 550-850 DEG C, keeping warm for 0.5-3 hours, and then heating into a first-grade aging stage; step three, after thefirst-grade aging stage, cooling the magnetic body to 75-85 DEG C by wind, and then heating into a second-grade aging stage; and step four, after the second-grade aging stage, cooling the magnetic body to 75-85 DEG C by the wind and taking the magnetic body out off the furnace, taking off the cover on the stone mill box, cooling the magnetic body to 35-45 DEG C by a fan, and acquiring the neodymium iron boron blank. The consistency of the intrinsic coercive force of the neodymium iron boron blank from the same furnace made by the heat treatment method is improved obviously, and meanwhile, themethod can effectively shorten the heat treatment time of the blank, so that the production cost and equipment energy consumption are reduced.

Description

technical field [0001] The invention relates to a heat treatment method for NdFeB products, in particular to a heat treatment method for improving the consistency of intrinsic coercive force of NdFeB blanks. Background technique [0002] Due to its excellent magnetic properties, NdFeB magnets play an extremely important role in our lives today, and have been widely used in pillar industries and high-tech industries around the world, such as computer industry, automobile industry, communication information industry, medical industry, Transportation industry, audio equipment, video playback industry, office automation and home appliance industry, etc. [0003] Since entering the 21st century, the miniaturization and miniaturization of equipment has always been the goal pursued by people. In recent years, new breakthroughs have been made in miniaturization technology, which is mainly manifested in the miniaturization of new generation components, high-density assembly technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/24B22F3/10H01F1/057
CPCB22F3/1007B22F3/24B22F2003/248B22F2999/00H01F1/0577B22F2201/20
Inventor 庞宁张朋越其他发明人请求不公开姓名
Owner CHINA JILIANG UNIV
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