Preparation method of annular radiation orientation magnet

A radiation orientation and ring technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of easy cracking, low magnet qualification rate, difficulty in improving the residual magnetism of radiation ring magnets, etc., and achieve heat resistance excellent effect

Pending Publication Date: 2020-10-13
JIANGXI JLMAG RARE EARTH
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Problems solved by technology

[0004] The above preparation process improves the coercive force of the magnet by adding heavy rare earths during smelting. After the heavy rare earths are added, the heavy rare earths will inevitably be distributed on the grain boundaries. The more heavy rare earths are added, the more heavy rare earths are on the grain boundaries of the magnet, and the brittleness The larger it will be, this will lead to easy cracking during cooling during sintering, the lower the qualified rate of magnets, and the greater the quality risk; and because heavy rare earths are added in the smelting stage, it is difficult to improve the remanence of radiant ring magnets

Method used

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  • Preparation method of annular radiation orientation magnet
  • Preparation method of annular radiation orientation magnet
  • Preparation method of annular radiation orientation magnet

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preparation example Construction

[0028] In the process of preparing the ring-shaped radiation orientation magnet, the applicant firstly prepared the radiation ring NdFeB blank. The preparation method of the radiation ring NdFeB blank is not particularly limited in this application, and is carried out according to the technical means well known to those skilled in the art. That is, as an example, it can be prepared in sequence according to the process of proportioning-smelting-milling-powder radiation orientation compression molding-vacuum sintering. The radiant ring NdFeB blank described in this application is the radiant ring NdFeB blank well known to those skilled in the art. In a specific embodiment, the specific composition of the radiant ring NdFeB blank includes: Pr-Nd: 28wt% ~33wt%; Nb: 0~5wt%; B: 0.5wt%~2.0wt%; Al: 0~3.0wt%; Cu: 0~2wt%; Co: 0~3wt%; Ga: 0~2wt%; Gd: 0-2wt%; Ho: 0-2wt%; Zr: 0-2wt%; the balance is Fe. In order to facilitate the diffusion of the radiant ring NdFeB blank, the present appli...

Embodiment 1

[0036] Prepare Tb80wt%-Al8wt%-Ga3.9wt%-Cu8wt%-H0.1wt% powder and add it to ethanol to form a suspension;

[0037] The 42SH magnet blank prepared by the steps of smelting, powder making, molding and sintering is processed into a semi-finished product of D22.5*d18.5*30.5, and the semi-finished product is processed and degreased to make the surface clean and smooth; The processed semi-finished product is soaked in the suspension and coated so that the surface is evenly coated with a layer of diffusion source, and then the semi-finished product is placed in the sintering box, and the sintering box with the semi-finished product is placed in the diffusion furnace and vacuumized to 10 -2 Below Pa, carry out in argon gas at a temperature of 700-950°C for 2-15 hours, and then perform a low-temperature tempering heat treatment at a temperature of 450-550°C for 3-7.5 hours to obtain an NdFeB magnet.

[0038] The preparation method of the 42SH magnet blank is as follows: Pr-Nd: 32.4%; B...

Embodiment 2

[0043] Prepare Tb90wt%-Al5wt%-Ga2.9wt%-Cu2wt%-H0.1wt% powder and add it to ethanol to form a suspension;

[0044] Preparation (45H raw material ratio): Pr-Nd: 31.5%; B: 0.98%; Zr: 0.15%; Cu: 0.1%; Co: 1%; Al: 0.35%; Ga: 0.1%; the balance is Fe. The 45H magnet blank prepared by smelting, powder making, molding, and sintering steps is processed into a semi-finished product of D22.5*d18.5*30.5, and the semi-finished product is processed and degreased to make the surface clean and smooth; then the pretreated The final semi-finished product is soaked in the suspension and coated so that the surface is evenly coated with a layer of diffusion source. Then the semi-finished product is placed in the sintering box, and the sintering box with the product is placed in the diffusion furnace. Vacuum to 10 -2 Below Pa, carry out in argon gas at a temperature of 700-950°C for 2-15 hours, and then perform a low-temperature tempering heat treatment at a temperature of 450-550°C for 3-7.5 hours...

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Abstract

The invention provides a preparation method of an annular radiation orientation magnet. The preparation method comprises the following steps: preparing a radiation ring neodymium iron boron blank; mixing HRx-My-Hz powder with an organic solvent to obtain a mixed solution, coating the surface of the radiation ring neodymium iron boron blank with the mixed solution, and then sintering; and carryingout heat treatment on the sintered radiation ring neodymium iron boron to obtain the annular radiation orientation magnet. Heavy rare earth elements are introduced into the radiation ring neodymium-iron-boron magnet through a diffusion method, the residual magnetism and coercive force of the annular radiation orientation magnet are improved, and the problem that the magnet cracks in the sinteringprocess is solved.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of an annular radiation orientation magnet. Background technique [0002] As we all know, with Nd 2 Fe 14 The R-Fe-B rare earth sintered magnet with B-type compound as the main phase is a permanent magnet and the magnet with the highest performance among all magnetic materials. It is widely used in voice coil motors (VCM) for hard disk drives, servo motors, and inverter air conditioners. Electric motors and electric motors for hybrid vehicles, etc. In order to adapt to the high temperature environment of the above motors, R-Fe-B rare earth sintered magnets need to have excellent heat resistance and high coercive force characteristics, while the radiation-oriented magnets are mainly used in servo motors and EPS steering motors. [0003] The biggest problem in the manufacturing process of radiation ring products is that cracking leads to low pass ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0576H01F1/0577H01F41/0266H01F41/0293
Inventor 孙长山毛华云毛琮尧赖欣杨金远肖文明
Owner JIANGXI JLMAG RARE EARTH
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