Patent · US Active

R-T-B series permanent magnet material, raw material composition preparation method and application

US12424359B2 · kind B2 · utility

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16Claims

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Assignee

FUJIAN GOLDEN DRAGON RARE-EARTH Co., Ltd. · CN

Inventors

Qin Lan · Fujian, CN
Dawei Shi · Beijing, CN
Jiaying Huang · Fujian, CN

Key dates

Filing date	Jul 7, 2020
Grant date	Sep 23, 2025
Priority date	—
Expiry date	Aug 9, 2040

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/12014
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

An R-T-B series permanent magnet material, a raw material composition, a preparation method, and an application. The R-T-B series permanent magnet material comprises the following components: R: 29-31.0 wt. %, RH is greater than 1 wt. %, B: 0.905-0.945 wt. %, C: 0.04-0.15 wt. %, N: 0.1-0.4 wt. %, and Fe: 67-69 wt. %, wherein R comprises RL and RH, RL is a light rare earth element, RL comprises Nd, RH is a heavy rare earth element, a (RL1-yRHy)2T17Cx phase is present at the grain boundary of the R-T-B series permanent magnet material, x: 2-3, y: 0.15-0.35, and T must comprise Fe, and also comprises one or more among Co, Ti and N. The permanent magnet material retains relative high Br and Hcj under different heat treatment temperatures.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.