Preparation method of high-strength permanent magnet

By adding alkali-free glass fibers of specific sizes and melting points in the preparation process of sintered magnets, the problem of improving bending performance but decreasing magnetic properties in the prior art is solved, and the flexural strength is significantly improved while the magnetic properties of high-strength permanent magnets remain unchanged.

CN119694769APending Publication Date: 2025-03-25HENGDIAN GRP DMEGC MAGNETICS CO LTD +1
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Patent Information

Application Number
CN202411872760.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

When the prior art, when applying aluminum silicate fibers to sintered magnets, although the bending strength is significantly improved, the magnetic performance is significantly reduced, making it difficult to improve the bending performance without changing the magnetic performance.

Method used

During the preparation of sintered magnets, the flexural resistance of the sintered magnet is significantly improved by adding alkali-free glass fibers during the secondary wet ball milling process, and the alkali-free glass fibers of specific sizes and melting points.

Benefits of technology

It is achieved that the flexural strength is significantly improved without changing the magnetic properties of the permanent magnet, and the problem of improving bending performance but decreasing magnetic properties in the prior art is solved.

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Abstract

The invention relates to the technical field of permanent magnets, and discloses a preparation method of a high-strength permanent magnet, which comprises the following steps: carrying out primary wet ball milling on a pre-sintered material and an additive, adding alkali-free glass fibers, carrying out secondary wet ball milling to prepare slurry, dehydrating the slurry, carrying out pressurized magnetic field forming to prepare a blank, and sintering the blank to obtain the high-strength permanent magnet. The monofilament diameter range of the alkali-free glass fibers is 11-17 [mu] m, and the length range of the alkali-free glass fibers is 10-50 [mu] m; according to the method, the alkali-free glass fibers with the specific size are added in the secondary ball milling process, and the breaking strength is remarkably improved under the condition that the magnetic performance of the sintered high-strength permanent magnet is kept unchanged by adding the alkali-free glass fibers with the specific size.
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