R-t-b based permanent magnet

JPWO2023080169A5Active Publication Date: 2025-09-25TDK CORP
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Patent Information

Application Number
JP2023558058
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-11-02
Filing Date
2022-11-02
Publication Date
2025-09-25
Estimated Expiration
2042-11-02

AI Technical Summary

Technical Problem

Existing RTB permanent magnets face challenges in achieving a well-balanced improvement of residual magnetic flux density at room temperature and coercive force at high temperatures.

Method used

An RTB permanent magnet composition containing Al, Ga, and Zr, with specific mass percentage ranges for R, B, Al, Ga, Zr, and other elements, along with a manufacturing process involving alloy preparation, grinding, molding, sintering, aging treatment, and surface treatment, to optimize magnetic properties.

Benefits of technology

The RTB permanent magnet achieves improved residual magnetic flux density at room temperature and coercive force at high temperature, with Br at room temperature (mT) and HcJ at 150°C satisfying the condition Br L +(HcJ H /3)≧1580, ensuring balanced performance.

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Abstract

The present invention relates to an R-T-B based permanent magnet containing Al, Ga, and Zr. The R content is greater than or equal to 30.00 mass% and less than or equal to 33.00 mass%, the B content is greater than or equal to 0.70 mass% and less than or equal to 0.88 mass%, the Al content is greater than 0 mass% and less than or equal to 0.07 mass%, the Ga content is greater than or equal to 0.40 mass% and less than or equal to 1.00 mass%, and the Zr content is greater than 0.10 mass% and less than or equal to 1.60 mass%.
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