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Rare earth permanent magnet and method of manufacturing the same

A rare earth permanent magnet, rare earth element technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as poor productivity

Active Publication Date: 2009-09-02
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods using evaporation or sputtering have many problems related to units and steps when implemented on a large scale, and have poor productivity

Method used

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  • Rare earth permanent magnet and method of manufacturing the same
  • Rare earth permanent magnet and method of manufacturing the same
  • Rare earth permanent magnet and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0056] The magnet alloy is prepared as follows: Nd, Fe and Co metals with a purity of at least 99% by weight, and iron-boron alloy are melted by high-frequency heating in an argon atmosphere, and then the alloy melt is poured into a copper mold. The alloy was ground on a Brown mill to a coarse powder with a particle size of up to 1 mm.

[0057] Subsequently, the coarse powder was finely pulverized into a fine powder having a mass median particle diameter of 5.2 μm on a jet mill using high-pressure nitrogen. At about 300kg / cm 2 The fine powder is compacted under the pressure of 1592kAm -1 orientation in the magnetic field. Then, the green body was put into a vacuum sintering furnace where it was sintered at 1060° C. for 1.5 hours to obtain a sintered block. The agglomerate was machined on all surfaces into a shape with dimensions 4 x 4 x 2 mm using diamond grinding tools. Wash it with alkaline solution, deionized water, nitric acid and deionized water successively, and dry ...

Embodiment 2 and comparative example 2

[0067] The magnet alloy is prepared as follows: Nd, Fe and Co metals with a purity of at least 99% by weight, and iron-boron alloy are melted by high-frequency heating in an argon atmosphere, and then the alloy melt is poured into a copper mold. The alloy was ground on a Brown mill to a coarse powder with a particle size of up to 1 mm.

[0068] Subsequently, the coarse powder was finely pulverized into a fine powder having a mass median particle diameter of 5.2 μm on a jet mill using high-pressure nitrogen. At about 300kg / cm 2 The fine powder is compacted under the pressure of 1592kAm -1 orientation in the magnetic field. Then, the green body was put into a vacuum sintering furnace where it was sintered at 1060° C. for 1.5 hours to obtain a sintered block. The agglomerate was machined on all surfaces into a shape with dimensions 4 x 4 x 2 mm using diamond grinding tools. Wash it with alkaline solution, deionized water, nitric acid and deionized water successively, and dry ...

Embodiment 3

[0078] The magnet alloy is prepared as follows: Nd, Fe and Co metals with a purity of at least 99% by weight, and iron-boron alloy are melted by high-frequency heating in an argon atmosphere, and then the alloy melt is poured into a copper mold. The alloy was ground on a Brown mill to a coarse powder with a particle size of up to 1 mm.

[0079] Subsequently, the coarse powder was finely pulverized into a fine powder having a mass median particle diameter of 5.2 μm on a jet mill using high-pressure nitrogen. At about 300kg / cm 2 The fine powder is compacted under the pressure of 1592kAm -1 orientation in the magnetic field. Then, the green body was put into a vacuum sintering furnace where it was sintered at 1060° C. for 1.5 hours to obtain a sintered block. The agglomerate was machined on all surfaces into a shape with dimensions 50 x 50 x 15 mm (Example 3-1) or a shape with dimensions 50 x 50 x 25 mm (Example 3-2) using a diamond grinding tool . Wash it with alkaline solu...

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Abstract

A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol% of an intermetallic compound phase on a sintered body of R-Fe-B system, and heating the sintered body having the powder disposed on surface thereof below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.

Description

technical field [0001] The present invention relates to an R-Fe-B permanent magnet, in which an intermetallic compound is combined with a sintered magnet body to increase its coercive force while minimizing its remanence drop, and to a preparation method thereof. Background technique [0002] Due to the excellent magnetic properties, the application range of Nd-Fe-B permanent magnets is expanding day by day. Recent environmental challenges have expanded the applications of these magnets from household appliances to industrial equipment, electric vehicles, and wind turbines. This requires further improvement of the performance of Nd-Fe-B magnets. [0003] The performance indicators of magnets include remanence (or remanence flux density) and coercive force. can be improved by increasing Nd 2 Fe 14 Volume factor of B compounds and improved crystal orientation to achieve increased remanence in Nd-Fe-B sintered magnets. To this end, a lot of improvement work has been done. ...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/10
Inventor 永田浩昭野村忠雄美浓轮武久
Owner SHIN ETSU CHEM IND CO LTD
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