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Method for producing rare-earth magnets, and slurry application device

A manufacturing method and coating device technology, applied to the surface coating liquid device, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of unsuitable mass production methods, time-consuming, etc., and achieve mass production Excellent and efficient effect

Active Publication Date: 2018-01-02
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the sintered magnet bodies are set and held between a pair of jigs, and the jigs are rotationally driven to rotate the sintered magnet bodies at a predetermined speed while spraying the slurry to coat a plurality of sintered magnet bodies. In the case of processing, the sintered magnet body is usually mounted on a jig by hand, rotated, sprayed with slurry, and then the rotation is stopped, and the coated magnet body is removed from the shaft by hand to be recovered. , install the next magnet body, and repeat the same operation, which is very time-consuming and completely unsuitable as a mass production method

Method used

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  • Method for producing rare-earth magnets, and slurry application device
  • Method for producing rare-earth magnets, and slurry application device

Examples

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Embodiment 1

[0066] For a thin plate-shaped alloy composed of Nd 14.5 atomic %, Cu 0.2 atomic %, B 6.2 atomic %, Al 1.0 atomic %, Si 1.0 atomic %, and the rest of Fe, Nd, Al, Fe, Cu metal, Si with a purity of 99.99% by mass, and ferroboron were high-frequency melted in an Ar atmosphere, and then a thin-plate-shaped alloy was produced by a so-called strip casting method in which copper was poured into a single roll. Expose the obtained alloy to 0.11MPa hydrogenation at room temperature to absorb hydrogen, then heat it to 500°C while vacuum exhausting to partially release hydrogen, and sieve it after cooling to make a 50-mesh or less alloy. coarse powder.

[0067] The above-mentioned coarse powder was finely pulverized by a jet mill using high-pressure nitrogen gas to obtain a powder with a weight median particle size of 5 μm. The mixed fine powder obtained was oriented in a magnetic field of 15 kOe under a nitrogen atmosphere, while using about 1 ton / cm 2 The pressure is formed into a blo...

Embodiment 2

[0083] Except for removing all the agitating members 52 from the coating apparatus of Example 1, slurry coating was performed on 200 of the above-mentioned plate magnets in the same manner as in Example 1. Stains showing uneven coating were not seen.

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Abstract

When a slurry in which a rare-earth-compound powder is dispersed is applied to sintered magnet bodies 1 and dried to apply the powder thereto, the sintered magnet bodies 1 are conveyed by a conveyer 2and made to pass through the slurry 4 to apply the slurry to the sintered magnet bodies 1. Furthermore, a plurality of push-up members 51, which pass through insertion holes 22 provided in a conveyorbelt 21, and protrude above the conveyor belt, are used to temporarily push up the sintered magnet bodies 1, and temporarily separate the conveyor belt 21 and the sintered magnet bodies 1. As a result, the slurry can be efficiently applied, even mass production can be suitably dealt with, and the slurry can be uniformly and reliably applied to the entire surface of each of the sintered magnet bodies.

Description

technical field [0001] The present invention relates to coating a slurry obtained by dissolving a powder containing a rare earth compound in a solvent on a sintered magnet body, drying the slurry, applying the powder, and heat-treating the slurry to absorb a rare earth element into the sintered magnet body. When producing a rare earth permanent magnet, the powder of the above rare earth compound can be uniformly and efficiently applied to efficiently obtain a rare earth magnet having excellent magnetic properties, and in the production method of the rare earth magnet A slurry coating device is preferably used. Background technique [0002] Rare earth permanent magnets such as Nd-Fe-B series have been widely used due to their excellent magnetic properties. Conventionally, as a method for further increasing the coercive force of the rare earth magnet, a method is known in which a powder of a rare earth compound is coated on the surface of a sintered magnet body, followed by h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02B05C3/10B05C13/02B05D1/18B05D5/12B22F3/00B22F3/24H01F1/057H01F1/08C22C38/00
CPCB05D5/12B05C3/10B05C13/02B22F3/00B05D1/18B22F3/24C22C38/002H01F1/0577B05D2401/10B05D2401/32C22C38/005H01F41/0293B22F9/04B22F2998/10B22F2999/00H01F1/0536H01F1/086
Inventor 栗林幸弘神谷尚吾前川治和田中慎太郎
Owner SHIN ETSU CHEM IND CO LTD