Broadband high-efficiency rare earth-based microwave absorbing material, preparation method and application thereof

By combining cobalt-based alloy powder and rare earth oxides, a broadband and high-efficiency rare earth-based microwave absorbing material was prepared, solving the problems of narrow bandwidth, high density and complex preparation of existing materials. This resulted in high efficiency, lightweight and stable electromagnetic wave absorption performance, making it suitable for multiple application scenarios.

CN122425200APending Publication Date: 2026-07-21DALIAN AVIC GANGYAN SUPERALLOY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN AVIC GANGYAN SUPERALLOY CO LTD
Filing Date
2026-05-26
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing rare earth-doped microwave absorbing materials suffer from problems such as narrow absorption bandwidth, high density, poor high-temperature stability, weak interfacial bonding, and complex preparation processes that make mass production difficult, thus failing to meet the needs of high-end equipment and special devices.

Method used

A broadband, high-efficiency rare-earth-based microwave absorbing material was prepared by combining cobalt-based alloy powder, rare-earth oxide powder, dielectric loss filler, pre-cured binder and additives, through processes such as ball milling, vacuum calcination, wet ball milling, low-pressure pre-pressing, isostatic pressing and high-temperature sintering, ensuring the internal uniformity of the material and the interfacial bonding strength.

Benefits of technology

It achieves wideband and high-efficiency absorption performance in the 2~18GHz frequency band, with a volume density of less than 2.8g/cm3. It has excellent high temperature resistance, corrosion resistance and aging resistance, and is suitable for aerospace, military equipment and high-end communication equipment. Moreover, the manufacturing process is simple and easy to control, making it suitable for industrial production.

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Abstract

The application discloses a kind of broadband high-efficiency rare earth-based microwave absorbing materials and its preparation method and application.The material is prepared from cobalt-based alloy powder, rare earth oxide powder, dielectric loss filler, pre-cured binder and specific proportioning auxiliary agent.Preparation, first, the raw materials are pretreated, and the forming powder is prepared by wet ball milling, ultrasonic dispersion, gradient ball milling and low-temperature drying, then by low-pressure pre-pressing, isostatic pressing and high-pressure compacting, finally, the finished product is obtained by low-temperature glue removal, medium-temperature curing, high-temperature sintering and slow cooling control under the protection of inert atmosphere.The application realizes 2~18GHz full-band coverage by rare earth doping and gradient preparation process, and the maximum reflection loss reaches-55.1dB, while it also has the advantages of light weight, high temperature resistance, corrosion resistance and excellent electromagnetic shielding performance, which can be widely used in electronic equipment electromagnetic shielding, military microwave stealth and precision instrument anti-interference field.
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