A fluidized bed-based method for graphene coating on powder surface

By mixing nano and micro powders in a fluidized bed and using pulsed carbon source supply, the problem of nano powder agglomeration was solved, and uniform coating of graphene on the powder surface was achieved, improving the coating rate and product performance.

CN122279528APending Publication Date: 2026-06-26ZHONGYUAN GRAPHENE LABORATORY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHONGYUAN GRAPHENE LABORATORY
Filing Date
2026-02-13
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Nanoparticles are prone to agglomeration during fluidized bed chemical vapor deposition, resulting in uneven deposition of graphene on the powder surface, low coating rate, and affecting the performance of end products.

Method used

Nanoparticles are mixed with micron-sized particles with a particle size 10 times larger than the nanoparticles. The mixture is then subjected to fluidized bed chemical vapor deposition with a pulsed carbon source. The turbulence and mechanical collision of the micron-sized particles are used to prevent the nanoparticles from agglomerating. The mixture is then sieved to obtain uniformly graphene-coated nano and micron-sized particles.

Benefits of technology

This technology enables uniform coating of graphene onto the surface of nano and micron powders, improving the coating rate, avoiding waste generation, and enhancing the performance of end products.

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Abstract

This invention relates to the field of graphene material preparation technology, and discloses a method for coating the surface of powder with graphene based on a fluidized bed, comprising: mixing nanoparticles and microparticles to obtain a mixed powder; wherein the nanoparticles and microparticles are made of the same material, the particle size D10 of the microparticles is more than 10 times larger than the particle size D90 of the nanoparticles, and the particle size D50 of the microparticles is 5~100μm; depositing graphene on the surface of the mixed powder through fluidized bed chemical vapor deposition to obtain a mixed graphene material; and sieving the mixed graphene material to obtain nanoparticles and microparticles coated with graphene. This invention can effectively reduce the agglomeration and caking of nanoparticles during fluidized bed chemical vapor deposition, and can form a good graphene coating on the surface of both nanoparticles and microparticles. The entire process requires no consumables and generates no waste products.
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