Method for sintering neodymium iron boron magnetic tile and spark plasma sintering device thereof

A discharge plasma and sintering device technology, which is applied in the direction of electromechanical devices, circuits, magnetic materials, etc., can solve the problems of low magnetic strength, easy cracking, and slow sintering speed, and achieve magnetic strength and strength improvement, uniform heating, and heating speed fast effect

Active Publication Date: 2016-06-01
JIANGSU PULONG MAGNETIC ELECTRICITY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of slow sintering speed, low magnetic strength and easy cracking of NdFeB magnetic tiles in the prior art, the present invention provides a method for sintering NdFeB magnetic tiles and a spark plasma sintering device thereof

Method used

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  • Method for sintering neodymium iron boron magnetic tile and spark plasma sintering device thereof
  • Method for sintering neodymium iron boron magnetic tile and spark plasma sintering device thereof
  • Method for sintering neodymium iron boron magnetic tile and spark plasma sintering device thereof

Examples

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Embodiment 1

[0042] Such as figure 1 , this specific embodiment discloses a method for sintering NdFeB magnetic tiles, including the following steps:

[0043]Step 1: Select the square NdFeB magnet blank obtained by the conventional method; NdFeB is divided into sintered NdFeB and bonded NdFeB, and the bonded NdFeB has magnetism in all directions and is corrosion-resistant; Because sintered NdFeB is easy to corrode, the surface needs to be plated. Generally, there are galvanized, nickel, environmentally friendly zinc, environmentally friendly nickel, nickel-copper-nickel, and environmentally friendly nickel-copper-nickel. Sintered NdFeB is generally divided into axial magnetization and radial magnetization, depending on the required working surface. As a preference, in this specific embodiment, the square NdFeB magnet blanks are placed in a radial distribution manner, and the field effective magnetic field distribution after installation of the magnetic force lines distributed by the radia...

Embodiment 2

[0050] This specific embodiment discloses a method for sintering NdFeB magnetic tiles. The difference from Example 1 is that the heating time of the spark plasma sintering device is 30 minutes, the holding time is 7 minutes, and the cooling time is 25 minutes. The sintering temperature is 700°C.

[0051] Compared with the magnetic tiles prepared in Example 1, the magnetic force and strength of the magnetic tiles prepared by adopting this specific embodiment are improved.

Embodiment 3

[0053] This specific embodiment discloses a method for sintering NdFeB magnetic tiles. The difference from Example 1 is that the heating time of the spark plasma sintering device is 35 minutes, the holding time is 10 minutes, and the cooling time is 25 minutes. The sintering temperature is 900°C.

[0054] The magnetic strength and strength of the magnetic tile produced by this specific embodiment are equivalent to those of the magnetic tile prepared in Example 1.

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Abstract

The invention provides a method for sintering a neodymium iron boron magnetic tile. The method comprises the following steps of 1, selecting a square neodymium iron boron magnet blank prepared by a conventional method; 2, cutting the square neodymium iron boron magnet blank into block-shaped thin sheets; 3, placing the block-shaped thin sheet neodymium iron boron magnet in an arc graphite box base at the bottom of a sintering furnace in a radial distribution mode; and 4, starting a spark plasma sintering device, and carrying out sintering, heat preservation and cooling. The spark plasma sintering device used for the method for sintering the neodymium iron boron magnetic tile comprises a hearth, a dual-layer liquid cooling device, an atmosphere control system and a heat preservation system, wherein the dual-layer liquid cooling device, the atmosphere control system and the heat preservation system are respectively and fixedly connected with the hearth, the dual-layer liquid cooling device comprises a slow-action liquid cooling outer layer and a high-speed liquid cooling inner layer, and the slow-action liquid cooling outer layer and the high-speed liquid cooling inner layer are fixedly connected. The magnetic tile prepared according to the method is large in magnetic dynamics and high in strength, and moreover, the magnetic tile is low in energy consumption during the fabrication process and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of magnet sintering technology, in particular to a method for sintering NdFeB magnetic tiles and a spark plasma sintering device thereof. Background technique [0002] Neodymium iron boron, simply speaking, is a kind of magnet. The difference from the magnets we usually see is that it is called the "magnet king" because of its excellent magnetic properties. NdFeB contains a large amount of rare earth elements neodymium, iron and boron, and its characteristics are hard and brittle. Since the surface is easily oxidized and corroded, NdFeB must be surface coated. Surface chemical passivation is one of the good solutions. As a kind of rare earth permanent magnet material, NdFeB has extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that the instrumen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02H02K15/00B22F3/105
CPCB22F3/105H01F1/0571H01F1/0575H01F41/0266H02K15/00
Inventor 李军杨平达钱定权顾红杨顺秋
Owner JIANGSU PULONG MAGNETIC ELECTRICITY CO LTD
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