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Flaky rare earth permanent magnet powder and preparation method thereof

A rare earth permanent magnet, flake technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of powder particle size distribution not specified

Inactive Publication Date: 2009-11-04
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1593820A discloses a nanocomposite permanent magnet powder and its preparation method. Although the patent has limited the average grain size and average particle diameter of the magnetic powder, it does not specify the particle size distribution of the powder, and the powder composition and preparation method There are also obvious differences from this patent

Method used

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  • Flaky rare earth permanent magnet powder and preparation method thereof
  • Flaky rare earth permanent magnet powder and preparation method thereof
  • Flaky rare earth permanent magnet powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of the magnetic powder in this example is as follows: according to the pre-designed components, a certain proportion of iron, cobalt, aluminum, copper, praseodymium-neodymium alloy, and boron-iron alloy is put into the crucible, and the bottom of the crucible has an opening of Φ1.5mm, and melted And during refining, the opening is blocked with a special stopper rod. Use intermediate frequency smelting to melt, wait until all metals or alloys are fully melted and then refine for 5 minutes. After refining, adjust the intermediate frequency power to keep the temperature of molten steel at a certain temperature, and then pull up the stopper rod to let the molten steel flow from the crucible Opening at the bottom to flow out. The molten steel flowing out is fully atomized through the ring-shaped high-pressure gas (Ar gas) nozzle to form a droplet flow, which is directly sprayed onto the high-speed rotating water-cooled copper wheel for rapid quenching ...

Embodiment 2

[0041] The preparation method of the magnetic powder in this example is as follows: according to the same composition ratio as in Example 1, a certain proportion of iron, cobalt, aluminum, copper, praseodymium-neodymium alloy, and boron-iron alloy are put into the crucible, and the bottom of the crucible has a Φ1.0mm The opening of the furnace is blocked by a special stopper rod during melting and refining. Use intermediate frequency smelting to melt, wait until all metals or alloys are fully melted and then refine for 5 minutes. After refining, adjust the intermediate frequency power to keep the temperature of molten steel at a certain temperature, and then pull up the stopper rod to let the molten steel flow from the crucible Opening at the bottom to flow out. The molten steel flowing out is fully atomized through the ring-shaped high-pressure gas (Ar gas) nozzle to form a droplet flow, which is directly sprayed onto the high-speed rotating water-cooled copper wheel for rapi...

Embodiment 3

[0045] The preparation method of the magnetic powder in this example is as follows: according to the same composition ratio as in Example 1, a certain proportion of iron, cobalt, aluminum, copper, praseodymium-neodymium alloy, and boron-iron alloy are put into the crucible, and the bottom of the crucible has a Φ2.0mm The opening of the furnace is blocked by a special stopper rod during melting and refining. Use intermediate frequency smelting to melt, wait until all metals or alloys are fully melted and then refine for 5 minutes. After refining, adjust the intermediate frequency power to keep the temperature of molten steel at a certain temperature, and then pull up the stopper rod to let the molten steel flow from the crucible Opening at the bottom to flow out. The molten steel flowing out is fully atomized through the ring-shaped high-pressure gas (Ar gas) nozzle to form a droplet flow, which is directly sprayed onto the high-speed rotating water-cooled copper wheel for rapi...

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Abstract

The invention relates to a flaky rare earth permanent magnet powder and a preparation method thereof, belonging to the fields of magnetic functional material and preparation technology. The invention provides the flaky rare earth permanent magnet powder used for bonded permanent magnet and the preparation method thereof. The magnet powder has round, elliptic or irregular flakiness, the average size of 60-300mum, average thickness of 20-60mum and granules formed by nanocrystal or amorphous structure with the average size of 30-120nm. Compared with a rapid quenching belt, the magnet powder is not needed to be ground and can be directly used for preparing magnet. Molten alloy is atomized by high pressure gas to form droplet flow, the liquid drops are sputtered onto a water-cooling substrate for rapid quenching, and the magnet powder is prepared after crystallization heat treatment. Compared with the traditional rapid quenching technique for preparing powder, the method has simple technique, high efficiency and low cost.

Description

technical field [0001] The invention relates to the technical field of magnetic functional materials and their preparation, and in particular provides a sheet-shaped rare earth permanent magnet powder for bonded magnets and a preparation method. Background technique [0002] The bonded rare earth permanent magnet is a kind of permanent magnet device that is directly injected or molded according to user requirements by mixing rare earth permanent magnet powder and bonding material. This type of magnet has the advantages of high dimensional accuracy, good magnetic uniformity, and easy processing into devices with complex shapes. It is widely used in micro-motors, automated office equipment, instrumentation, magnetic machinery and other devices and equipment. [0003] The key to preparing bonded magnets is rare earth permanent magnet powder. The performance of magnetic powder directly determines the quality and market price of bonded magnets. At present, the mature bonded rare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/06B22F9/02
Inventor 李红卫李扩社于敦波赵春雷罗阳王民胡权霞
Owner GRIREM ADVANCED MATERIALS CO LTD
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