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Powder for sintering rare-earth permanent magnet

A rare-earth permanent magnet and powder technology, which is applied in the direction of magnetic objects, permanent magnets, magnetic materials, etc., can solve the problems that the magnetic properties of sintered rare-earth permanent magnets have not been greatly improved, and the cost of powder formulations cannot be reduced. Strengthen the effect of liquid phase assisted sintering, optimize the microscopic end, and improve the effect of encapsulation

Active Publication Date: 2013-05-08
ORIENT MAGNET TECH OMT
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The current mainstream technologies for preparing sintered rare earth permanent magnet powders are relatively mature and have good results, but there are problems as follows: (1) The formulation cost of the powder cannot be effectively reduced while ensuring the magnetic properties; (2) When two or more powders are mixed, the composition, average particle size, and melting point of powder alloys of different powders are not designed, so that the magnetic properties of the prepared sintered rare earth permanent magnets have not been greatly improved. Temperature resistance is not improved compared to magnets prepared using single alloy powders

Method used

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  • Powder for sintering rare-earth permanent magnet
  • Powder for sintering rare-earth permanent magnet
  • Powder for sintering rare-earth permanent magnet

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Embodiment approach

[0026] 1) The quick-setting sheets of two alloys made by the traditional quick-setting process are 90kg alloy 1 quick-setting sheet and 10kg alloy 2 quick-setting sheet;

[0027] 2) Mix the quick-setting sheets of the two alloys, and then place them in a hydrogen furnace for ventilation and crushing;

[0028] 3) Under the protection of inert gas, take out the alloy hydrogen powder, and carry out the jet mill process to make powder; obtain the powder for preparing sintered rare earth permanent magnet;

[0029] 4) Orientate the obtained powder in a magnetic field with a magnetic field of 1.2T, and carry out isostatic pressing;

[0030] 5) Send the formed blank into a sintering furnace under the protection of an inert gas for sintering, and perform heat treatment to obtain the final sintered rare earth permanent magnet.

[0031] figure 2 Shown is another embodiment of the invention:

[0032] 1) The quick-setting sheets of two alloys made by the traditional quick-setting proce...

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Abstract

The invention relates to powder for preparing and sintering a rare-earth permanent magnet. The powder is obtained by mixing two kinds of powder with different ingredients, different average particle sizes and different melting points. By that the powder is used for preparing and sintering the rare-earth permanent magnet, the temperature endurance of the magnet can be improved, production cost is reduced, and heavy rare earth resources are saved.

Description

technical field [0001] The invention relates to the preparation of rare earth permanent magnets, in particular to a powder of sintered rare earth permanent magnets. Background technique [0002] Due to the characteristics of high remanence, high coercive force and high magnetic energy product, sintered rare earth permanent magnets are widely used in power electronics, communications, information, motors, transportation, office automation, medical equipment, military and other fields. my country's sintered rare earth permanent magnets have been mass-produced since 1985, and their output has ranked first in the world since its development. It is estimated that by 2020, China will become the center of the world's magnetic material industry. [0003] At present, with the extensive application of sintered rare earth permanent magnets, reducing product costs and improving the temperature resistance of magnets has become a future trend. According to the current related research, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/08H01F7/02
Inventor 陈必成董生智张有章
Owner ORIENT MAGNET TECH OMT
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