Preparation process of high-performance high-resistance seven-series permanent magnetic ferrite and product prepared by preparation process

By adding high-resistance iron red, BaCO3 and white carbon black to the preparation process of seven-type permanent magnet ferrite, and using zirconia ceramic balls for ball milling, the problem of low resistance of existing seven-type permanent magnet ferrite is solved, and the high-performance and high-resistance seven-type permanent magnet ferrite is achieved, which significantly improves its magnetic and electrical properties.

CN119751040AActive Publication Date: 2025-04-04SINOSTEEL ANHUI TIANYUAN TECH
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Patent Information

Application Number
CN202411981367.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2025-04-04
Estimated Expiration
2044-12-31

AI Technical Summary

Technical Problem

The current seven-type permanent magnet ferrite has a low resistance, which leads to eddy current phenomenon in a specific magnetic field and causes eddy current loss.

Method used

A high-performance, high-resistance, seven-type permanent magnet ferrite preparation process is adopted, including mixing, pre-oxidation, crushing, secondary ingredients, secondary ball milling and secondary sintering. By adding high-resistance iron red to the prefired material, and adding BaCO3 and white carbon black to the auxiliary material, zirconia ceramic balls are used as ball milling medium to regulate the electrical and magnetic characteristics of the material.

Benefits of technology

The resistance value of the seven-series permanent magnet ferrite is significantly improved, and the performance indicators of Br≥420mT, Hcb≥320KA/m, Hcj≥375KA/m, and resistance≥24MΩ are met, while the magnetic and dielectric properties are improved.

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Abstract

The invention discloses a preparation process of a high-performance high-resistance seven-series permanent magnetic ferrite and a product prepared by the preparation process, and belongs to the technical field of permanent magnetic ferrites. The method comprises the following steps: stirring and mixing a nine-series pre-sintered material and high-resistance iron red in proportion, pre-oxidizing after mixing to form a permanent magnetic ferrite pre-sintered material, and then crushing the pre-sintered material; and mixing the pre-sintered material obtained in the step a with auxiliary materials in proportion, ball-milling, and carrying out secondary sintering to obtain the high-resistance seven-series permanent magnetic ferrite, so that the resistance of the permanent magnetic ferrite can be effectively improved.
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