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Method for manufacturing sintered magnet, and sintered magnet

A sintered magnet and magnetic technology, applied in the direction of magnetic objects, magnetic materials, transportation and packaging, etc., can solve the problems of the reduction of the saturation magnetic polarization of the compound and the reduction of the residual magnetic flux density, and achieve the effect of high density

Active Publication Date: 2020-11-06
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, substitution with Dy or Tb reduces the saturation magnetic polarization of the compound
Therefore, when the heavy rare earth element Dy or Tb is added, the coercive force can be increased, but the residual magnetic flux density is inevitably reduced

Method used

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  • Method for manufacturing sintered magnet, and sintered magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: ammonium fluoride (NH 4 F) coating

[0058] Add 34.35g Nd 2 O 3 , 69.50g Fe, 1.05g B, 0.0309g Cu, 0.262g Al and 18.412g Ca were uniformly mixed with alkali metals Na and K in a sealed plastic container to control the particle size. Thereafter, it was uniformly placed in a stainless steel container, and reacted in a tubular electric furnace at a temperature of 920℃ to 950℃ for 30 minutes to 6 hours in an inert gas (Ar) atmosphere. Then, the reaction product is pulverized by an automatic pulverizer, and the residual calcium compounds are removed by using organic solvents such as ethanol or methanol and ammonium nitrate. Thereafter, 10g of the pulverized reaction product was mixed with 0.375g of ammonium nitrate, 125ml of methanol, and 50g of zirconia balls, and then pulverized and dried for 1 to 2 hours using a turbula mixer. In this way, Nd-Fe-B powder was prepared.

[0059] After ammonium nitrate and methanol are removed from Nd-Fe-B powder, 0.05g to 0.10g ammon...

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Abstract

A method for manufacturing a sintered magnet according to an embodiment of the present invention comprises the steps of: preparing a mixed powder by applying a fluoride to the surface of a magnetic powder; adding a heavy rare earth hydride to the mixed powder; and heating the mixed powder, wherein the magnet powder comprises a rare earth element-iron-boron based powder, and the fluoride comprisesat least one of an organic fluoride and an inorganic fluoride.

Description

Technical field [0001] Cross-references to related applications [0002] This application claims the benefit of Korean Patent ApplicationNo. 10-2018-0125899 filed in the Korean Intellectual Property Office on Oct. 22, 2018, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present disclosure relates to a method for preparing sintered magnets and sintered magnets prepared thereby, and more particularly, to a method for preparing sintered magnets based on R-Fe-B and sintered magnets prepared thereby. technical background [0004] The NdFeB-based magnet is Nd with compounds of neodymium (Nd, that is, rare earth elements), iron and boron (B) 2 Fe 14 B, and this magnet has been used as a general permanent magnet for 30 years since its development in 1983. The NdFeB-based magnet is used in many fields such as electronic information, automobile industry, medical equipment, energy, transportation and so on. Particularly, with the trend of light we...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057B22F1/02B22F1/102B22F1/16
CPCH01F41/0293H01F1/0577B22F1/16B22F1/102H01F41/0266B22F2301/355
Inventor 金仁圭权纯在崔益赈鱼贤洙李正九
Owner LG CHEM LTD