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Method of producing anisotropic magnetic powder

專利號
US10867728B2
公開日期
2020-12-15
申請人
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.

說明書

Second reduction temperature temperature Temper- Dura- Temper- Dura- ature tion ature tion iHc Example No. (° C.) (min) (° C.) (min) (Oe) Example 20 1045 45 1030 60 17310 Example 21 1045 45 1030 60 16030 Comparative Example 8 1045 45 — — 14680 Comparative Example 9 1045 45 — — 14310

權(quán)利要求

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