A three-dimensional flower-shaped VC x N 1-x / Ti2AlC x N 1-x Construction method of strong microwave absorbing material

By constructing a three-dimensional flower-like VCxN1-x/Ti2AlCxN1-x material, the problems of complex preparation process and difficult morphology control of traditional MAX phase materials are solved, and the material preparation with high electromagnetic wave absorption performance is realized, which is suitable for aerospace, nuclear industry and other fields.

CN122301141APending Publication Date: 2026-06-30KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Filing Date
2026-05-08
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional MAX phase materials have complex preparation processes, difficult morphology control, poor impedance matching, and narrow absorption bandwidth, which cannot meet the electromagnetic wave absorption requirements of high-end equipment.

Method used

A three-dimensional flower-shaped VCxN1-x/Ti2AlCxN1-x strong microwave absorbing material construction method is adopted. By mixing Ti source, V source, Al source, agglomerated organic fiber and inorganic salt, drying, grinding and heat treatment are carried out, and the holding time is controlled to form a three-dimensional petal-shaped micro-nano structure. The material is controllably prepared by using the molten salt method combined with template technology.

Benefits of technology

A MAX phase material with a unique three-dimensional petal structure was prepared, achieving synergistic effects of multiple scattering and various loss mechanisms, exhibiting excellent electromagnetic wave absorption performance, and suitable for large-scale industrial production.

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Abstract

This invention relates to the field of new material synthesis technology, and discloses a three-dimensional flower-like VC x N 1‑x / Ti2AlC x N 1‑x A method for constructing a strong electromagnetic wave absorbing material involves uniformly mixing a Ti source, a V source, an Al source, bulk organic fibers, and inorganic salts, followed by a one-step molten salt heat treatment under an inert protective atmosphere. The organic fibers are pyrolyzed to simultaneously provide carbon and nitrogen sources and act as sacrificial templates, inducing in-situ self-assembly of MAX phase crystals to form a three-dimensional petal-shaped micro / nano structure. After washing and drying, the target product is obtained. This product, through V doping, introduces lattice distortion dipole polarization and abundant heterointerface polarization effects, which, combined with the multiple scattering effect of the flower-like structure, significantly enhance electromagnetic wave absorption performance. The measured minimum reflection loss reaches -77.1 dB, the effective absorption bandwidth is 3.86 GHz, and the electromagnetic shielding effectiveness reaches 13.9 dB. This invention features a simple and efficient process that allows for simultaneous control of the morphology and composition of the MAX phase material, facilitating industrial production.
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Citation Information

Patent Citations

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