Mg / MgO magnesium-based composite material with gradient impedance structure as well as preparation method and application of Mg / MgO magnesium-based composite material

By controlling the ball milling time and layered powder spreading combined with hot pressing sintering, a Mg/MgO magnesium-based composite material with a gradient impedance structure was prepared, which solved the problem that it is difficult to realize the gradient impedance structure in magnesium-based composite materials, achieved efficient electromagnetic wave absorption and shielding, and reduced secondary electromagnetic pollution.

CN122012969APending Publication Date: 2026-05-12KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610076612.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-21
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing magnesium-based composite materials are difficult to achieve a controllable gradient impedance structure in electromagnetic shielding, resulting in reflection loss being higher than absorption loss, which cannot effectively reduce secondary electromagnetic pollution.

Method used

By controlling the ball milling time and layered powder spreading combined with hot pressing sintering, a Mg/MgO magnesium-based composite material with gradually increasing oxygen content along the thickness direction was prepared to form a gradient impedance structure. The MgO-Mg heterostructure interface was used to enhance interfacial polarization and multi-level reflection.

Benefits of technology

It significantly improves absorption shielding effectiveness (SEA) and reduces reflection shielding effectiveness (SER), achieving highly efficient electromagnetic wave absorption shielding, reducing secondary electromagnetic pollution, and maintaining the lightweight characteristics of the material.

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Abstract

The invention discloses an Mg / MgO magnesium-based composite material with a gradient impedance structure as well as a preparation method and application of the Mg / MgO magnesium-based composite material, and relates to the technical field of electromagnetic shielding materials. The preparation method specifically comprises the following steps: taking magnesium powder in an inert atmosphere, and carrying out ball milling treatment for different times to respectively obtain magnesium powder with different oxygen contents; paving the magnesium powder with different oxygen contents in a reaction device according to the sequence of the ball milling treatment time from short to long in an inert atmosphere; and carrying out vacuum hot pressed sintering on the reaction device, and then cooling to obtain the Mg / MgO magnesium-based composite material with the gradient impedance structure. Through the synergistic effect of gradient impedance design and hot pressing sintering, electromagnetic wave reflection on the surface of the material is remarkably reduced, and the electromagnetic wave absorption efficiency is enhanced. The electromagnetic shielding effectiveness of the prepared composite material in the X wave band is remarkably improved, efficient electromagnetic shielding dominated by absorption is achieved, and secondary electromagnetic pollution is effectively reduced.
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