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Method of producing anisotropic magnetic powder

專利號(hào)
US10867728B2
公開(kāi)日期
2020-12-15
申請(qǐng)人
NICHIA CORPORATION（JP Anan）
發(fā)明人
Hisashi Maehara
IPC分類
B22F9/22; H01F1/059; H01F1/055; C01B21/06; B22F1/00; B22F9/24; B22F1/02
技術(shù)領(lǐng)域
sm,fe,coercive,in,magnetic,powder,particles,ihc,solution,oxide
地域： Anan

摘要

The present invention relates to a method of producing an anisotropic magnetic powder having good magnetic properties. The method of producing an anisotropic magnetic powder includes: pretreating an oxide containing Sm and Fe by heat treatment in a reducing gas atmosphere to obtain a partial oxide; heat treating the partial oxide in the presence of a reductant at a first temperature of 1000° C. or higher and 1090° C. or lower and then at a second temperature lower than the first temperature and in the range of 980° C. or higher and 1070° C. or lower to obtain alloy particles; and nitriding the alloy particles to obtain an anisotropic magnetic powder.

說(shuō)明書

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application claims priority to Japanese Patent Application No. 2017-246741 filed on Dec. 22, 2017 and Japanese Patent Application No. 2018-229110 filed on Dec. 6, 2018. The disclosures of Japanese Patent Application No. 2017-246741 and Japanese Patent Application No. 2018-229110 are hereby incorporated by reference in their entireties.

BACKGROUND Technical Field

The present invention relates to a method of producing an anisotropic magnetic powder.

Description of Related Art

JP 2008-171868 A discloses a method of producing a rare earth-iron-nitrogen anisotropic magnetic powder in which a starting powder is mixed with a reductant, and subsequently a rare earth oxide powder is reduced and diffused into iron. However, the anisotropic magnetic powder has insufficient magnetic properties, and there is room for improvement.

JP H05-78715 A discloses a method of producing a rare earth metal-containing alloy powder in which a rare earth metal oxide is subjected to an initial reduction-diffusion step and then to a second reduction-diffusion step. However, this method is intended to produce a neodymium magnetic material, and involves reduction-diffusion at a very low temperature to reduce sagging of some low melting point alloy components to the bottom of a reaction vessel during the production of a neodymium magnetic material.

SUMMARY

The present invention aims to provide a method of producing an anisotropic magnetic powder having good magnetic properties.

權(quán)利要求

1
What is claimed is:1. A method of producing an anisotropic magnetic powder, comprising:pretreating an oxide containing Sm and Fe by heat treatment in a reducing gas atmosphere to obtain a partial oxide;heat treating the partial oxide in the presence of a reductant at a first temperature of 1000° C. or higher and 1090° C. or lower and then at a second temperature lower than the first temperature and in a range of 980° C. or higher and 1070° C. or lower to obtain alloy particles; andnitriding the alloy particles to obtain an anisotropic magnetic powder,wherein the heat treatment at the second temperature is performed for 10 minutes or more.2. The method of producing an anisotropic magnetic powder according to claim 1,wherein the second temperature is lower than the first temperature by 15° C. or more and 60° C. or less.3. The method of producing an anisotropic magnetic powder according to claim 1,wherein the heat treatment at the first temperature and the heat treatment at the second temperature are continuously performed.4. The method of producing an anisotropic magnetic powder according to claim 1,wherein the heat treatment at the first temperature is performed for less than 120 minutes.5. The method of producing an anisotropic magnetic powder according to claim 1, wherein the oxide containing Sm and Fe further contains La.6. The method of producing an anisotropic magnetic powder according to claim 1, wherein the oxide containing Sm and Fe further contains W.7. The method of producing an anisotropic magnetic powder according to claim 1, wherein the oxide containing Sm and Fe further contains Co.
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